Campbell SC105 CS Manuel utilisateur

SC105 CS I/O to RS-232

Interface

Revision: 11/13

Campbell Scientific, Inc.

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warranted by Campbell Scientific, Inc. (“Campbell”) to be free from defects in

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which shall be the sole and exclusive remedy under this warranty. The

customer shall assume all costs of removing, reinstalling, and shipping

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performed by Campbell such as programming to customer specifications,

electrical connections to products manufactured by Campbell, and product

specific training, is part of Campbell’s product warranty. CAMPBELL

EXPRESSLY DISCLAIMS AND EXCLUDES ANY IMPLIED

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PARTICULAR PURPOSE. Campbell is not liable for any special, indirect,

incidental, and/or consequential damages.”

Assistance

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SCIENTIFIC, INC., phone (435) 227-9000. After an application engineer

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CAMPBELL SCIENTIFIC, INC.

RMA#_____

815 West 1800 North

Logan, Utah 84321-1784

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Table of Contents

PDF viewers: These page numbers refer to the printed version of this document. Use the

PDF reader bookmarks tab for links to specific sections.

1. General Description....................................................1

2. Specifications .............................................................2

3. Set-up Menu ................................................................3

3.1 Set-up Menu Selections........................................................................4

4. Installation...................................................................5

5. RAD Modem Application ............................................5

5.1 RAD Modem - Two Way.....................................................................6

5.2 RAD Modem Wiring and Grounding...................................................6

5.3 Testing RAD Modem Communication ................................................8

6. CDMA Modem Application .........................................9

7. Freewave Radio Application ......................................9

Figures

1-1. SC105 CS I/O to RS-232 Interface ......................................................1

3-1. Set-up Menu.........................................................................................4

5-1. Two Way Communication ...................................................................6

5-2. Installation of Spark Gap Protection ....................................................7

Tables

5-1. Approximate Range, miles and km......................................................6

SC105 CS I/O to RS-232 Interface

1. General Description

FIGURE 1-1. SC105 CS I/O to RS-232 Interface

The SC105 (FIGURE 1-1) is used to interface a Campbell Scientific datalogger

to any modem that is configured with an RS-232 DCE (Data Communications

Equipment) serial port. The SC105 is an intelligent interface that buffers data

(1 kB buffer size), allowing many RS-232 data rates, and all CS I/O port

modes.

Features include:

•True RS-232 signal levels.

•Power for the SC105 is supplied from the 5 V supply on pin 1 of the

datalogger’s CS I/O port. The SC105 will use the 5 V supply to power the

RS-232 modem if needed.

•Two way (interactive) communication.

•Supports most RS-232 baud rates.

•Supports all CS I/O port modes.

The SC105 is frequently used with a short haul modem to communicate across

a dedicated line made of two pairs of twisted wire with a shield. Section 3, Set-

up Menu, describes the details of this application using a short haul modem

built by RAD.

The SC105 is also commonly used with satellite transmitters, cellular modems,

and spread spectrum radios.

The SC105 also supports one-way output or printer communication.

SC105 CS I/O to RS-232 Interface

2. Specifications

RS-232 9-Pin Male Connector Pin-out:

Pin No. I/O Name Description

1 In DCD Data Carrier Detect (No Connection)

2 In RXD Received Data

3 Out TXD Transmitted Data

4 Out DTR Data Terminal Ready

5 GND Signal Ground

6 In DSR Data Set Ready (No Connection)

7 Out RTS Request to Send – Modem Enable

8 In CTS Clear to Send

9 In Ring Rings Datalogger

CS I/O 9-Pin Male Connector Pin-out:

Pin No. I/O Name Description

1 In +5 V Regulated 5 Volt supply

2 GND Ground

3 Out Ring Ring signal to datalogger

4 Out RXD SC105 transmits on this line

5 In ME Modem Enable—must be high for transfer in

ME mode

6 In SDE Synchronous Device Enable

7 In CLK/HS Clock/Handshake (for synchronous

communication)

8 +12 V Not Used

9 In TXD SC105 receives on this line

SC105 CS I/O to RS-232 Interface

RS-232 Baud Rates: The SC105 will support the following baud

rates: 1200, 9600, 19200, 38400, 57600, and

115200

RS-232 Parity and Data

The SC105 supports the following:

Parity: Even, Odd, None

Data Bits: 7, 8

CS I/O Port Modes: CSDC, SDC, ME, Addressed Print Device for

P96 output

Electrical: The SC105 uses power from the +5 V line on

the 9-pin interface connected to the datalogger

Current

Standby: 0.16 mA

Communicating: 1 to 4 mA

Additional current (up to 8 mA) from the 5 V

supply may be used by the RS-232 device

connected to the SC105

Physical

Height: 2.3 cm (0.9 in)

Width: 4.1 cm (1.6 in)

Length: 8.9 cm (3.5 in)

Weight: 45.4 g (1.6 oz)

Environmental

Temperature: –25° to +50°C

Humidity: up to 95% non-condensing

3. Set-up Menu

The SC105 has a built-in set-up menu for configuring communication mode,

CS I/O port configuration, RS-232 port configuration, and other parameters.

The Set-up Menu is shown in FIGURE 3-1. It is accessed by connecting the

SC105’s RS-232 port to a PC with the included null modem cable. The SC105

also needs to have power. Usually, the SC105 is powered by connecting the

SC105’s CS I/O port to the CS I/O port of a datalogger.

With the null modem connection to the PC, typically Campbell Scientific’s

Device Configuration Utility (DevConfig) is used, but a terminal program such

as HyperTerminalTM or ProcommTM (always 9600 baud, 8-N-1) can also be

used. Press the Program button on the SC105 for one second to access the

Set-up Menu. Changed settings are saved in flash memory by selecting Apply

in DevConfig or menu item 4if using HyperTerminal or Procomm. If left idle,

the Set-up Menu will time out 60 seconds after the last received character and

exit without saving any parameter changes with the message “Set-up Timeout.”

A datalogger can remain connected to the CS I/O port (to provide power to

SC105) while setting SC105 parameters on the RS-232 port, although CS I/O

communications would be inactive until exiting the Set-up Menu.

SC105 CS I/O to RS-232 Interface

SC105 - SW Version 2.0

Main Menu: Current Configuration

(1) CS I/O Port Configuration [Modem Enable]

(2) RS-232 Port Configuration [9600]

(3) Restore Factory Defaults

(4) Save and Exit

(5) Exit w/o Saving Settings

(9) Help

Enter Choice:

FIGURE 3-1. Set-up Menu

3.1 Set-up Menu Selections

1) CS I/O Port Configuration

An SC105 may be activated either by the Modem Enable signal or by a

Synchronous Device (SDC) address (7, 8, 9, 10, or 11).

If PakBus Networking is being used, SDC address 7, 8, 10, or 11 should

be selected.

Addressed Print Device is a mode that allows output from the datalogger

when it executes the P96 instruction.

2) RS-232 Port Configuration

RS-232 baud rate, data bits, and parity are configured here, as well as the

RS-232 Auto Power Down (APD) Mode. The APD mode should be left

enabled, unless the attached RS-232 device requires power from the

RS-232 lines.

The DTR and RTS Mode setting allows control over how these two lines

behave.

DTR is on pin 4 of the RS-232 connector; RTS is on pin 7.

‘PC/PDA mode’: DTR and RTS are both driven to 5 V.

‘Modem mode’: DTR will be driven to +5 V when the CS I/O interface

is active for Modem Enable, SDC Address 9, and

Addressed Print Device configurations. When the

CS I/O is inactive, DTR will be 0 V.

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