Microflex Microlink-HM+ Manuel du propriétaire

Installation

Operation

Specifications

620-0034 R1 © Microﬂex 2016-2020

101-0097

MicroLinK HM+

HART Protocol Modem

HART to Modbus Accumulator

USB, RS-485 or RS-232 Communications Port

DIN Rail Mount

Safety Consideraons............................................................................................................................................ 1

Overview............................................................................................................................................................... 2

Conﬁguraon ........................................................................................................................................................ 2

Block Diagram ....................................................................................................................................................... 3

Mounng .............................................................................................................................................................. 4

Power Supply ........................................................................................................................................................ 4

Connecng to a HART Loop .................................................................................................................................. 4

Serial Port.............................................................................................................................................................. 5

USB Port ................................................................................................................................................................ 5

USB Drivers ....................................................................................................................................................... 5

Modbus Registers.................................................................................................................................................. 6

Speciﬁcaons ........................................................................................................................................................ 7

Warranty ............................................................................................................................................................... 9

Table of Contents

• Read and understand this manual before starƟng the conﬁguraƟon and installaƟon.

• InstallaƟon and wiring should be performed by a professional to meet all facility, local, and state

requirements and regulaƟons.

Safety Considerations



Conformity in accordance with Part 2, and Part 15, Subparts A and B of

the Federal Communications Rules and Regulations, and ICES-003 of the

Industry Canada standards.

This device complies with part 15 of the FCC rules. Operation is subject to

the following two conditions: (1) This device may not cause harmful interfer-

ence, and (2) this device must accept any interference received, including

interference that may cause undesired operation. Changes or modifications

not expressly approved by Microflex could void the user’s authority to oper-

ate this equipment.

Emissions EN55022: 1998

Electrostatic Discharge EN61000-4-2: 1995, A1: 1998, A2: 2001

Radiated Immunity EN 61000-4-3: 2002

Safety Compliance EN 60950-1: 2002

This device is not intended for connection to the phone line through the

appropriate converters and shall not be connected to telecommunication

lines because it has no protection against over-voltages which may exist in

these lines.

The user shall ensure the protection of the operator from access to areas

with hazardous voltages or hazardous energy in their equipment.

The user shall ensure that the connection port of the field device and the

modem is separated at least by basic insulation from any primary circuit

existing in the field device.



Overview

MicroLink-HM+ is a HART®protocol modem to USB/RS-485/RS-232 serial interface. In addion to funconing as a HART

protocol modem, it can also be conﬁgured to connuously poll HART devices, ﬁlling modbus registers with device values

without any addional HART soware. Modbus registers can then be read using modbus-RTU command 3 from the USB

and/or RS-485/RS-232 serial ports.

As a HART protocol modem the serial port is typically set to 1200 baud, odd parity. Most HART soware will require

these sengs. It is possible to set the serial port to other baud rates and parity sengs. In this case MicroLink-HM will

receive the HART command at the higher baud rate then transmit the HART data at 1200 baud, odd parity onto the

HART loop. The 1200 baud, odd parity HART reply packet is received by the MicroLink-HM modem and then transmied

back at the higher baud rate.

MicroLink-HM+ ships conﬁgured to operate as a HART protocol modem compable with most HART conﬁguraon

and test soware. Included on the CD is the PACTware FDT frame, HART Protocol DTM, and Microﬂex Generic DTM

soware. For informaon on installing PACTware and the DTM, please reference the PACTware Quick Start Guide. Serial

communicaons to the HART modem can be USB, RS-485, or RS-232. The serial port is set for RS-485 protocol, 1200

baud, odd parity by default. Use the HM Conﬁgurator app, included on the CD, to change the port sengs.

If Fill Modbus Registers mode is enabled, MicroLink-HM will funcon as a HART master (primary or secondary) conn-

uously polling devices and storing variable values into registers. No addional HART soware is needed. The HART loop

may contain a single device or up to 16 devices. When more than one device is in the loop each HART device must have

a unique HART polling address. The address for each device is set separately before wiring the device into the mul-

drop loop. The HART Device Addresser soware applicaon, installed with the HM Conﬁgurator app, can be used to

assign addresses to HART devices.

Modbus-RTU command 3 is used to read the registers from the MicroLink-HM modbus slave. Variable data can be read

as 16 bit integers or 32 bit ﬂoang point. Up to 4 variables plus loop current for each polled HART device is available.

If conﬁgured to Fill Modbus Registers and a HART packet is received on the USB or RS-485/RS-232 port MicroLink-HM

will temporarily switch to HART modem mode and pause polling devices. A packet type is idenﬁed by monitoring the

ﬁrst byte received in a new packet. HART protocol packets always begin with a hex FF preamble character and modbus

packets begin with the slave address. If no HART commands are received over the serial port for 60 seconds, or if a

modbus slave address is received, MicroLink-HM will exit HART modem mode and resume polling and ﬁlling modbus

registers.

Modbus port type, slave address, baud rate, parity, and other sengs are set using the HM Conﬁgurator app soware.

MicroLink-HM Configuration

Conﬁguraon changes are done using the included HM Conﬁgurator app. The app can be connected to the MicroLink-

HM+ USB port or to the RS-485/RS-232 serial port. The serial port was set at the factory to RS-485 mode. To change the

serial port to RS-232 mode you must connect using the USB port ﬁrst.

The USB port can supply power to the MicroLink-HM. This allows you to make conﬁguraon changes without

connecng an external power supply.

Refer to the HM Conﬁgurator App manual for details on installing and using the conﬁguraon soware.

Power

Supply

RS-485/RS-232

Transceiver

HART

Modem

Microcontroller

Modbus Register

Tables

RTS

1 - DC (+)

2 - DC (-)

3 - GND

4 - TX B

5 - RX A

5-Pin

Terminal Block

HART Loop

Terminals

HART LED

COM LED

USB

MicroLink-HM+ Block Diagram

HART Loop Screw Terminals

USB Port

HART Transmit/Receive LED

DIN Rail Release

Serial Port Transmit/Receive LED

+/- DC Power 5-30VDC

G Serial Port Common

B/A RS-485 Port

TX/RX RS-232 Port

Address 0

LOOP

POWER

SUPPLY 250Ω

Address 1

HART

DEVICE

Address 2

HART

DEVICE

Address 15

HART

DEVICE

LOOP

POWER

SUPPLY

HART

DEVICE

250Ω

Figure 1. Connecting HART modem to device loop.

HART Loop with One Device

HART Multi-Drop Loop

Connect the two screw terminals to the HART device

or HART loop. Microlink provides electrical isolaon

between the HART loop and the serial port so it is safe

to ignore grounding and polarity issues when making

the HART connecons. Figure 1 shows one device and

mul-drop HART loop connecons.

The HART protocol requires a loop resistance of

230 to 600 ohms, typically 250 ohms.

Refer to your equipment installaon instrucons for

details on connecng a HART master or conﬁguraon

device to the loop.

Mounting

The DIN rail mounting clip is compatible with widely used 35mm EN 50022 rails. It can be snap mounted and removed

from the mounting rail without tools for quick installation and servicing.

Power Supply

MicroLink-HM+ requires an external 5 to 30 volt DC power supply.

Posive side to Pin 1, and negave side to Pin 2 on the 5-pin screw terminal block.

Maximum supply current ranges from 5mA at 30 volts to 25mA at 5 volts.

In most cases the transmier loop power supply can be used to power MicroLink-HM, eliminang the need for a

dedicated MicroLink-HM supply.

Power can also be supplied by an acve enumerated USB port, making conﬁguraon possible with only a USB

connecon. MicroLink-HM+ can funcon as a USB to HART protocol modem without the need for an external power

supply.

Connecting to a HART Loop



USB Port

The USB port can be used for device conﬁguraon, monitoring, or as a USB to HART protocol modem. MicroLink-HM

can disnguish between HART and modbus packets. When a HART protocol packet is received on USB it will be routed

directly to the HART modem and transmied onto the HART loop. If MicroLInk-HM is polling devices the polling process

will be disabled while the HART command is being processed. Polling will be re-enabled aer 60 seconds of no HART

packet acvity on the USB port or if a modbus packet is received on the USB port.

USB Drivers

USB drivers create a virtual serial COM port that appears as a serial port to your applicaon soware. If your PC is

connected to the Internet the drivers will be automacally downloaded and installed when the HM modem is ﬁrst

connected to a USB port. The drivers can also be installed before connecng to the USB port by running

ﬁle CDM21228_Setup.exe from the included CD. To download drivers got to www.microﬂx.com/pages/drivers.

The USB virtual serial port operates at 1200 baud and odd parity, slave ID 250, and uses standard modbus commands to

read and write registers.

Use the Windows Device Manager to determine the assigned Com port number. It will be listed under

Ports (COM & LPT) while the cable is aached to the MicroLink-HM+ USB port.

Serial Port

The serial port can be conﬁgured for RS-485 or RS-232 protocol using the HM Conﬁgurator app soware or by wring to

modbus register 775. The factory default is RS-485 mode, 1200 baud odd parity.

RS-485 Serial Protocol

An RS-485 bus can consists of mulple RS-485 devices connected in parallel to a bus cable. To eliminate line reﬂecons,

each cable end should be terminated with a terminaon resistor whose value matches the characterisc impedance

of the cable. This method, known as parallel terminaon, allows for higher data rates over a longer cable length.

MicroLink-HM+ does not include internal RS-485 terminaon internally.

• Connect terminal G to the RS-485 bus shield or ground wire. Internally connected to Supply (-) or ground

• Connect terminal B to the RS-485 bus B or (+)

• Connect terminal A to the RS-485 bus A or (-)

MicroLink-HM does not provide isolaon between the RS-485 port and power supply ground.

The G terminal is internally connected to the power supply (-) terminal.

RS-232 Serial Protocol

By default the serial port is set to RS-485 protocol. Connect HM Conﬁgurator app soware to the MicroLink-HM USB port to change

the serial port to RS-232 mode using the Setup -> Modbus dialog.

Figure 2 shows typical wiring connecons to connect to a 9-Pin RS-232 connector. Only transmit, receive, and ground are used.



5 GND

2 RX

3 TX

5V to 30V

DC SUPPLY

MicroLink-HM+ HART

Loop

RS-232

Serial Port

DB-9 Female

Figure 2. Connecting to DB-9 RS-232 9-Pin serial port.

Modbus Registers

and can be downloaded from www.microﬂx.com.

Write Locking

Wring to registers can be locked or write-protected aer seng the conﬁguraon to prevent unwanted changes to the

conﬁguraon. Refer to the HM Conﬁgurator soware manual for details on write locking and unlocking registers.

Polled HART Devices Long Address Table, 700 - 747

Device ID informaon is read from each polled device using the devices polling address and HART command 0. The

reply to command 0 for each polled device is used to populate the long address table. When MicroLink-HM needs to

poll for the device variables, using HART command 3, this table holds the informaon needed to build the 5-byte long

address. Table values can be read using modbus-RTU command 3. Only the polled devices you have conﬁgured will

contain valid informaon. The table is updated when the device address is unknown or a bad HART reply was received.

HART Device Polling Address Table, 748 - 755

The polling address for each polled device is stored in this table. Two polling addresses in each 16 bit register. If ad-

dress 0 is used then only one device can be polled and Device 1 should be set to 0. Address 0 is not valid in mul-drop

systems. For HART devices with HART revision 3 through 5 you should use polling addresses 1 - 15. Addresses 16-63

require HART revision 6 or higher.

Number of Decimal Places Table, 756 - 771

When storing the HART variable data in 16-bit modbus registers the maximum range is -32768 to 32767. To increase the

possible resoluon, the variable value read from the HART device is decimal posion adjusted before being saved in the

16-bit register. When the register is read, the value must be corrected by the number of decimal places to produce the

correct value. The number of decimal places for each variable occupies 4-bits in the register with one register for each

polled device.

Setup Registers, 772 - 777

The MicroLink-HM conﬁguraon can be changed using the HM Conﬁgurator App or by wring to modbus registers using

modbus-RTU commands 6 or 16. Command 6 writes to a single register and command 16 writes to a range of modbus

registers. The conﬁguraon register values are saved in nonvolale memory and are not lost when MicroLink-HM power

is removed.

Specifications

Power

Supply Range..................................................................................................................................5 to 30 Volts DC

Max Operang Current .................................................................................................... 25mA @ 5V, 5mA @30V

Typical Operang Current ......................................................................................... 8.8mA @ 12V, 5.2mA @ 24V

Field Connections

Terminaon................................................................................................ Pluggable Screw Terminal, 26-16 AWG

+ Power Supply (+) ......................................................................................................................................... Pin 1

- Power Supply (-).......................................................................................................................................... Pin 2

G Serial Port Ground Internally connected to Supply (-)................................................................................. Pin 3

TX B RS-485 (+), RS-232 Transmit ................................................................................................................... Pin 4

RX A RS-485 (-), RS-232 Receive ..................................................................................................................... Pin 5

HART Modem

Terminaon...............................................................................................Pluggable Screw Terminals, 26-12 AWG

Connecon Method ............................................................................... Transformer Isolated, Capacitor Coupled

Loop Isolaon..................................................................................... 3000Vrms 1 min Pri-Sec Dielectric Strength

DC Loop Voltage.................................................................................................................................... 50Vdc Max

Demodulaon Jier ................................................................................................................. 12% of 1 bit Typical

Carrier Detect Threshold..................................................................................................................100mV Typical

Leakage to Process Loop .......................................................................................................................±10μA Max

Serial Port

Baud Rates .........................................................................1200, 2400, 4800, 9600, 14400, 19200, 39400, 57600

Parity............................................................................................................................................ None, Odd, Even

Protocol................................................................................................. HART or Modbus-RTU, Commands 3,6,16

Floang point byte order ............................................................................................ AD-CD or CD-AB (swapped)

Number of polled HART devices ..................................................................................................................1 to 16

Variables per polled HART device .................................................................................................(4) PV, SV, TV, FV

Supported Modbus-RTU Commands .......................................................................................................... 3, 6, 16

Surge Protecon.................................................................................................. 600W Silicone Avalanche Diodes

±15kV (HBM) ESD Protected Bus (RS-232 or RS-485)

RS-485 Mode

Driver Output Voltage................................................................................. 2V Min Unloaded, 1.5V Min RL = 50Ω

ΔInput Threshold Receive Voltage ............................................................................................................ +/- 0.2V

Receiver Input Hysteresis....................................................................................................................... 35 mV Typ

Receiver Input Current....................................................................................................................... +/- 1mA Max

Does not include RS-485 terminaon resistor

• Auto transmit control

• Power Up/Down glitch-free permits live inseron or removal

• Common mode range permits +/-7V ground diﬀerence

RS-232 Mode

Receiver Input Voltage Range ...................................................................................................................... +/-25V

Receiver Input Threshold ............................................................................................................VIL 1.1V, VIH 1.6V

Receiver Input Hysteresis...............................................................................................................................35mV

Transmier Output ..................................................................................................................................+/-5V Typ

USB

Connector ..................................................................................................................................................... USB-B

Type & Sengs ..................................................................................... FTDI Virtual Com Port, 1200 Baud, 8, O, 1

Protocol...................................................................HART or Modbus-RTU, Slave address 250, Commands 3,6,16

HART LED

Green ........................................................................................................................ HART Modem is transming

Red ................................................................................................................................. HART modem is receiving

COM LED

Green ............................................................................................................................. Serial Port is Transming

Red ......................................................................................................................................Serial Port is Receiving

Default Settings

Serial Port.........................................................................................RS-485 Mode, 1200 Baud, Odd Parity, 1 Stop

Modbus Address ................................................................................................................................................... 1

Fill Modbus Registers ..............................................................................Disabled (HART Protocol Modem Mode)

Poll Interval .............................................................................................................................................2 Seconds

Environmental

Operang Temperature............................................................................................-30°C to 60°C (-22°F to 140°F)

Storage Temperature ...............................................................................................-40°C to 85°C (-40°F to 185°F)

Humidity ......................................................................................................................0 to 95% (non-condensing)

Enclosure

Polycarbonate plasc with Stainless Steel Cover

Weight....................................................................................................................................................2.3 ounces

Mounng ................................................................................................................................. 35mm DIN Rail Clip

2.45

62.3 mm

3.32

84.2 mm

1.58

40.1 mm

1.03

26.2 mm

.42

10.6 mm

1.66

42.2 mm

SN: 123456

Limited Warranty

Microﬂex, LLC warrants this unit against defects in materials and workmanship for a

period of one year from the date of shipment. Microﬂex, LLC will, at its option, repair or

replace equipment that proves to be defective during the warranty period. This warranty

includes parts and labor.

A Return Materials Authorization (RMA) number must be obtained from the factory

and clearly marked on the outside of the package before equipment will be accepted for

warranty work.

Microﬂex, LLC believes that the information in this manual is accurate. In the event that

a typographical or technical error exist, Microﬂex, LLC reserves the right to make changes

without prior notice to holders of this edition. The reader should consult Microﬂex, LLC

if any errors are suspected. In no event should Microﬂex, LLC be liable for any damages

arising out of or related to this document or the information contained in it.

EXCEPTAS SPECIFIED HEREIN, MICROFLEX, LLC MAKES NO WARRANTIES OR

MERCHANTABILITY OR FITNESS FORA PARTICULAR PURPOSE. CUSTOMER’S

RIGHT TO RECOVER DAMAGES CAUSED BY FAULT OR NEGLIGENCE ON THE

PART OF MICROFLEX SHALL BE LIMITED TO THE AMOUNT THERETOFORE

PAID BY THE CUSTOMER. MICROFLEX, LLC WILL NOT BE LIABLE FOR

DAMAGES RESULTING FROM LOSS OF DATA, PROFITS, USE OF PRODUCTS,

OR INCIDENTAL OR CONSEQUENTIAL DAMAGES, EVEN IF ADVISED OF THE

POSSIBILITIES THEREOF. This limitation of the liability of Microﬂex, LLC will apply

regardless of the form of action, whether in contract or tort, including negligence. Any

action against Microﬂex, LLC must be brought within one year after the cause of action

accrues. The warranty provided herein does not cover damages, defects, malfunctions, or

service failures caused by owners failure to follow Microﬂex, LLC’s installation, operation,

or maintenance instructions; owners modiﬁcation of the product; owner’s abuse, misuse, or

negligent acts; and power failure or surges, ﬁre, ﬂood, accident, actions of third parties, or

other events outside reasonable control.

Microﬂex, LLC

35900 Royal Road

Pattison, Texas 77423

USA

The HART protocol is supported by the HART Communications Foundation in Austin

Texas, www.hartcomm.org. HART is a registered trademark of the HART Communications

Foundation.

Phone 281-855-9639

Fax 832-422-4391

www.microﬂx.com

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