ELECRAFT KAT500 Manuel d'installation

Elecraft KAT500 Automatic Antenna Tuner

Serial Command Reference

Revised 4/26/2016 firmware version 01.70

Elecraft KAT500 Automatic Antenna Tuner Serial Command Reference .....................................................1

Serial port overview...................................................................................................................................... 4

Command Format ..................................................................................................................................... 4

Using KAT500 Utility to Test Commands ..................................................................................................5

Commands and responses............................................................................................................................ 6

; (null command, GET only)....................................................................................................................... 6

AE (Antenna Enable, GET and SET) ........................................................................................................... 6

AFT (Automatic Fine Tune, GET and SET)..................................................................................................6

AKIP (Amplifier Key Interrupt Power Threshold, GET and SET) ................................................................ 7

AMPI (Interrupt amplifier key, GET and SET)............................................................................................ 8

AN (Select Antenna, GET and SET)............................................................................................................8

AP (Antenna Preference, GET and SET) .................................................................................................... 8

ATTN (Enable Attenuator, GET and SET)................................................................................................... 9

BN (Band Number, GET and SET).............................................................................................................. 9

BR (Serial I/O Speed, GET and SET).........................................................................................................10

BYP (Bypass, GET and SET)......................................................................................................................10

C (Select capacitors, GET and SET)..........................................................................................................11

CT (Cancel Full Search Tune, SET only) ...................................................................................................12

EEINIT (Clear configuration and frequency memories, SET only)........................................................... 12

EM (Erase frequency memory, SET only)................................................................................................12

F (Frequency, GET and SET) .................................................................................................................... 12

FA (Memory Recall Tune, SET only) ........................................................................................................12

FCCS (Frequency Counter Consecutive Sample Time, GET/SET) ............................................................13

FCMD (Frequency Counter Match Distance, GET/SET)...........................................................................13

FLT (Fault query, GET only) .....................................................................................................................14

FLTC (Clear Fault, SET only).....................................................................................................................14

I (Identify, GET only)................................................................................................................................15

L (Select Inductors, GET and SET)............................................................................................................16

MD (Mode, GET and SET)........................................................................................................................17

MT (Memory Recall Tune, SET only)....................................................................................................... 17

MTA (Memory Recall Tune on frequency change in mode AUTO, GET/SET) .........................................17

MTM (Memory Recall Tune on frequency change in mode MAN, GET/SET) .........................................18

PS (Power off/on, GET/SET) ....................................................................................................................18

PSI (Power Status Initial, GET/SET) .........................................................................................................18

RSTx (Reset, SET only)............................................................................................................................. 18

RV (Firmware version, GET only) ............................................................................................................19

SIDE (Select Side, GET and SET)...............................................................................................................19

SL (Enable or disable Sleep when Idle, GET and SET) ............................................................................. 20

SM (Save Memory, SET only) .................................................................................................................. 21

SN (Serial Number, GET only) .................................................................................................................21

ST (SWR Threshold, GET and SET)...........................................................................................................22

T (Start Full Tune, SET only) ....................................................................................................................22

TP (Tune Poll, GET only).......................................................................................................................... 22

VFWD (Forward coupler voltage ADC count, GET only) ......................................................................... 23

VRFL (Reflected coupler voltage ADC count, GET only)..........................................................................23

VSWR (Voltage Standing Wave Ratio, GET only) ....................................................................................23

VSWRB (Voltage Standing Wave Ratio in Bypass, GET only) ..................................................................23

Serial port overview

KAT500 commands and their responses use the printable ASCII character set. Commands are sent to the

KAT500 via its “PC DATA” serial port. Use 4800, 9600, 19200, or 38400 bit/s, 8 bit characters, one stop

bit and no parity. There is no flow control. The KAT500 Utility discovers the KAT500’s serial port speed

by sending a few null commands (semicolons) at each of the speeds and selects the speed that results in

responses. You can change the KAT500’s serial port speed with the Baud Rate (BR) command.

Beginning with firmware version 01.38, the microcontroller may be configured to “sleep”when logically

“off” or otherwise idle. It takes a few serial port characters and about 100 milliseconds to wake up, and

characters sent during the wakeup period may be lost. The KAT500 Utility sends semicolons at

approximately 100 millisecond intervals until the KAT500 firmware begins to respond. See the SL

command.

Command Format

KAT500 commands are either GET or SET.

GET commands are used to get information from the KAT500; the KAT500 provides that information in a

RESPONSE message.

SET commands are used to change the KAT500’s internal state or to initiate an action. SET commands do

not generally generate a RESPONSE. SET can be followed by a GET to verify the SET. In some cases (FT;) a

SET causes a response at the completion of an action. RESPONSEs generally look like the corresponding

SET command.

Each command is followed by a terminating semicolon character. For example, to query the current

firmware revision, send “RV;” (send R, V, and semicolon).

Examples:

RV; GETs the firmware revision number. The RESPONSE is of the form RV01.13;

AN1; SETs the KAT500 to use Antenna 1. There is no response.

AN; GETs the currently selected antenna. The RESPONSE is of the form AN1;

After sending a GET command, you should generally wait for the corresponding RESPONSE before

sending more commands. The KAT500 has a limited size input command buffer. You may safely “stack

up” 64 bytes of commands without risk of overrun. If you wish to send a very long sequence of SET

commands, break them up with an intervening GET (such as the null command or RV;) that returns a

RESPONSE and wait for those responses. Flow control is at the application level.

Commands may be entered in UPPER or lower case. RV; and rv; are equivalent. Responses (with the

exception of the permanent boot block response to I;) are UPPERCASE.

Using KAT500 Utility to Test Commands

The KAT500 Utility Command Tester can be used to try individual commands. Try typing “RV;” in the

input area. The command and its response are shown on the output area.

Commands and responses

; (null command, GET only)

GET format: ; (a single semicolon)

RESPONSE format: ;

The KAT500 Utility sends a few semicolons to determine the serial port speed during a connection

sequence and to wake up a sleeping microcontroller.

AE (Antenna Enable, GET and SET)

GET format: AEbba;

SET/RESPONSE format: AEbba0; for disable; AEbba1; for enable.

Enables or disables an antenna connector for a specified band. bb is the band number; see the BN

command. a is the antenna number: 1, 2, or 3. Successive presses of the ANT button skip disabled

antennas.

Example: AE0030; disables ANT3 on 160 meters. AE1031; enables ANT3 on 6 meters.

Disabling the currently selected antenna may result in a KAT500 ANT change.

This command is used by the KAT500 Utility Edit Configuration dialog.

AFT (Automatic Fine Tune, GET and SET)

GET format: AFTbb;

SET/RESPONSE format: AFTbb0; (disabled) or AFTbb1; (enabled) where bb is a band number (see BN).

For example, AFT031; enables this capability on band number 03, which is 40 meters.

Full search tune starts with a “coarse” step that tests several inductance values to find an approximate

starting point for finer granularity searches. In some cases with high SWR antennas, particularly on low

bands, not enough inductance values are tested to find a good starting point. Enabling AFT causes full

search coarse tune to try more inductor settings. Full search coarse tune takes longer, but may find

matching solutions for some difficult antenna loads that are not otherwise found.

This command is used by the KAT500 Utility Edit Configuration Auto Fine Tune tab.

A similar fine tune is accomplished by pressing the KAT500 TUNE button within five seconds of

completion of a full search tune. If the first tune doesn’t find a match, the second tune might.

AFT was added in firmware version 01.39.

AKIP (Amplifier Key Interrupt Power Threshold, GET and SET)

GET format: AKIP;

RESPONSE format: AKIP wwwwW VFWD aaaa;

SET format: AKIP wwww;

If you are using an Elecraft KPA500, you should increase this value to 1500. If you are using an

amplifier with a frame or vacuum relay that cannot be “hot switched” at full amplifier output power,

set AKIP to the power your relay can hot switch. The default “factory” value for this threshold is 30, but

that may change in future firmware versions.

AKIP GETs or SETs a transmit power threshold below which the KAT500 can interrupt the amplifier key

line. The KAT500 must interrupt the amplifier key line before it changes other relays during Memory

Recall or Full Search Tune: bypass, antenna, capacitors, and inductors.

Some amplifiers, such as the Elecraft KPA500, use solid-state transmit/receive switching devices that are

designed to permit the amplifier key line to be interrupted while transmitting. For the KPA500, the AKIP

threshold should be set to its “unlimited” value: 1500 watts (AKIP 1500;). Use 1500 even if the amplifier

is incapable of supplying that much power.

Some amplifiers, such as my Ameritron AL-1200, use a frame relay and “hot switching” the amplifier key

line with high transmit power might damage the relay. I use 100 watts (AKIP 100;), which is enough to

pass all the unamplified power of my K3, but lower than the power I’d expect with the amplifier in

“operate”.

The RESPONSE format shows the power in watts, and the VFWD threshold that is used to monitor this

threshold.

While the transmitter power exceeds this threshold, some KAT500 front panel button presses are

ignored, as are serial commands (and KAT500 Utility functions) that change relays: MD, AN, BYP, C, L,

SIDE, etc.

TUNE may be started with a higher transmitter power, but power must drop below this threshold before

TUNE interrupts the amplifier key line. Tune-level power must be applied again to complete the tuning

process. After tuning, transmit power must be reduced to zero before the amplifier key interrupt relay is

released, unless the “unlimited” value 1500 watts is used.

AKIP was added in firmware version 01.05

AMPI (Interrupt amplifier key, GET and SET)

GET format: AMPI;

SET/RESPONSE format: AMPI0; (amplifier key line connected), AMPI1; (amplifier key line interrupted).

GETs or SETs the amplifier key line interrupt relay, K23. AMPI1; selects the relay, interrupting the

amplifier key line. AMPI0; releases the relay, connecting the amplifier key line.

The amplifier key line must be run through the KAT500’s amplifier key line interrupt relay.

15-pin ACC cables used between the K3, KAT500, and KPA500 provide this amplifier key line interrupt

capability. Alternatively, two-wire cables with RCA connectors may be used between transceiver and

KAT500, and KAT500 and amplifier. See the KAT500 Owner’s Manual for connection diagrams.

It may take a few tens of milliseconds after issuing an AMPI SET before the relay is changed.

The SET form of this command may be ignored if the current transmit power exceeds the AKIP power

threshold.

The amplifier key interrupt relay may be changed by TUNE operations.

AN (Select Antenna, GET and SET)

GET format: AN;

SET/RESPONSE format: AN0; AN1; AN2; or AN3;

Antenna selection is deferred if a tune is in progress. Antenna selection is ignored if the antenna is

disabled on the current band (see the AE command).

AN0; advances to the next enabled antenna, simulating a press of the ANT button on the KAT500 front

panel. AN0; was added in firmware revision 01.55

It may take a few tens of milliseconds after issuing an ANx; setter before relays are changed.

The SET form of this command is ignored while transmitting or tuning.

AP (Antenna Preference, GET and SET)

GET format: APbb; where bb is a Band Number, see the BN command.

SET/RESPONSE format: APbba; where bb is a Band Number and ais an antenna number, 0, 1, 2, or 3. 0

is interpreted as “the last used antenna on this band”.

The KAT500 normally returns to the last-used antenna on band change. However, a “preferred” antenna

may be configured so that the ATU always starts at a fixed antenna for a given band.

For example, AP103; causes ANT3 to be selected whenever you band switch to 6 meters, regardless of

the last-used antenna on 6 meters.

AP SET is ignored if the antenna is disabled (see AE).

ATTN (Enable Attenuator, GET and SET)

GET format: ATTN;

SET/RESPONSE format: ATTN0; (disabled) or ATTN1; (enabled).

Selects relay K22, which switches in an attenuator resistor.

It may take a few tens of milliseconds after issuing an ATTNx; setter before the relay is changed.

Firmware releases the attenuator if it detects power high enough to damage to the attenuator.

Firmware normally inserts the attenuator during “full search tune” to present a more consistent load to

a transceiver during tune operations. The attenuator is disabled if the tune power is too low with the

attenuator in place.

BN (Band Number, GET and SET)

GET format: BN;

SET/RESPONSE format: BNbb; where bb is 00 to 10, see the table below.

The ATU is switched to the target band. The appropriate last used or “preferred” antenna is selected.

The ATU inductor and capacitor relays are set to the most recent setting used for the tuner on the

indicated band.

KAT500 Band Numbers are the same as the K3 Programmer Reference Band Numbers, but differ from

the BCD values of the four BAND lines.

It may take a few tens of milliseconds for this command to have an effect. Relays will not change until

the transmitter power is below the AKIP threshold.

The Band may be subsequently overridden by a change to the four BAND lines in the accessory

connector, or by counting the transmit frequency.

Band

160 meters

80 meters

60 meters

40 meters

30 meters

20 meters

17 meters

15 meters

12 meters

10 meters

6 meters

BR (Serial I/O Speed, GET and SET)

GET format: BR;

SET/RESPONSE format:

BR0; for 4800 bit/s,

BR1; for 9600 bit/s,

BR2; for 19200 bit/s or

BR3; for 38400 bit/s. Firmware load automatically chooses 38400 bit/s.

Serial I/O speed significantly affects the time required for configuration save and restore. 38400 bit/s is

recommended unless you have a specific reason to use a lower speed.

BYP (Bypass, GET and SET)

GET format: BYP;

SET/RESPONSE format: BYPN; (not bypassed) or BYPB; (bypassed).

Gets or sets the bypass relays K20 and K21. These relays are in the bypassed position when not

energized.

It may take a few tens of milliseconds after issuing a BYPx; setter before relays are changed. Relays are

not changed until the transmit power is below the AKIP threshold.

Firmware releases inductor, capacitor, and SIDE relays while bypassed to reduce power consumption.

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