User manual

Using the Relay Multiplexer 35Chapter 2
Chapter 2
Using the Relay Multiplexer
Using This Chapter
This chapter shows how to use the Relay Multiplexer module, including:
• Multiplexer Commands/States . . . . . . . . . . . . . . . . . . . . . . . . 35
• Switching Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
• Scanning Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
• Miscellaneous Multiplexer Functions . . . . . . . . . . . . . . . . . . . 51
Multiplexer Commands/States
This section summarizes Relay Multiplexer module commands, queries,
and reset states. Table 2-1 shows multiplexer commands used in this
chapter. See Chapter 3 for additional information about the commands.
Table 2-1. Selected Multiplexer Commands Used in Chapter 2
Command Description
INITiate[:IMMediate] Starts the scan sequence and closes the first channel in the channel_list.
OUTPut:TTLTrg
n [:STATe] ON Enables selected output to trigger pulses from the TTL Trigger bus line specified.
OUTPut:EXTernal][:STATe] ON Enables selected output to trigger pulses from command module’s "Trig Out" port.
[ROUTe:]CLOSe < channel_list > Closes the channels in the channel_list.
[ROUTe:]CLOSe? <
channel_list > Queries the state of the closed channels in the channel_list.
[ROUTe:]FUNCtion
<
card_number >,< function >
Sets the operating mode to one-wire, two-wire, three-wire, or four-wire.
[ROUTe:]OPEN <
channel_list > Opens the channels in the channel_list.
[ROUTe:]SCAN <
channel_list >< Defines the channels to be scanned. Channels specified in the channel_list 
are closed one at a time.
[ROUTe:]SCAN:PORT Closes bank COM terminals to the analog bus during a scan.
[ROUTe:]SCAN:MODE Sets the scan mode to volts, 2-wire ohms, or 4-wire ohms.
TRIGger:SOURce <
source > Selects the trigger source to advance the scan.
*CLS Clears all switchbox status registers and error queue.
*ESE Enables event status register.
*RST Resets the hardware and software to a known state.
*SRE Enables status register.