User manual

Relay Multiplexer Command Reference 81Chapter 3

Comments Order of Command Execution: The [ROUTe:]SCAN:MODE and

[ROUTe:]FUNCtion commands must be executed before the

[ROUTe:]SCAN <channel_list> command.

[ROUTe:]SCAN:MODE versus [ROUTe:]FUNCtion:FRES: Measurement

mode is not supported when FUNCtion is set to WIRE1 (one-wire mode).

NONE and VOLT Mode: When selected, channel_list is setup for volts

measurements. VOLT mode is also used when making two-wire ohms

measurements using two-wire multimeters.

RES Mode: When selected, channel_list is setup for two-wire ohms

measurements. Control relay 0994 is closed when SCAN:PORT ABUS

is selected. When selected, the multimeter SENSE/SOURCE leads are

used to make the measurement. When using the HI/LO leads on a

multimeter to make the measurement, use the VOLT mode.

FRES Mode: When selected, channel_list is setup for four-wire ohms

measurements. When using four-wire ohms measurement mode, only

the lower bank (0-3) is specified with the [ROUTe:]SCAN <channel_list>

command. The upper bank pair (4-7) will automatically select the

specified channel. Selecting an upper bank (4-7) channel causes an

error.

*RST Condition: [ROUTe:]SCAN:MODE NONE

Example Selecting Four-Wire Ohms Measurements

This example selects four-wire ohms measurement mode (FRES) on

card #1 of a single-module switchbox.

FUNC 1,WIRE4

!Set mode to four-wire

TRIG:SOUR EXT

!Selects external trigger source

SCAN:MODE FRES

!Selects four-wire W scan mode

SCAN (@130:137)

!Scan channels 0 to 7 in bank 3 (paired



with channels 0 to 7 in bank 7)

INIT

!Starts scanning cycle