User manual

Relay Multiplexer Command Reference 93Chapter 3
Using the TRIGger Command: You can use TRIGger[:IMMediate] to
advance the scan when TRIGger:SOURce BUS> or TRIGger:SOURce
HOLD is selected.
One Trigger Input Selected at a Time: Only one input (ECLTrg0 or 1;
TTLTrg0, 1, 2, 3, 4, 5, 6, or 7; or EXTernal) can be selected at one time.
Enabling a different trigger source will automatically disable the active
input. For example, if TTLTrg1 is the active input, and TTLTrg4 is
enabled, TTLTrg1 will become disabled and TTLTrg4 will become the
active input.
Using External Trigger Inputs: With TRIGger:SOURce EXTernal
selected, only one switchbox at a time can use the external trigger input
at the E1406A “Trig In” port. The trigger input is assigned to the first
switchbox that requested the external trigger source (with an
TRIGger:SOURce EXTernal command).
Using TTL or ECL Trigger Bus Inputs: With TRIGger:SOURce TTLTrgn or
ECLTrgn selected, only one switchbox at a time can use the trigger bus
selected on the E1406A Command Module bus. The trigger input is
assigned to the first switchbox that requested the trigger source (with a
TRIGger:SOURce TTLTrgn or ECLTrgn command). Only one of the ten
available trigger bus lines (ECL0 to 1 or TTL0 to 7) can be specified at
one time.
Assigning EXTernal I TTLTrg I ECLTrg Trigger Source: A switchbox
assigned with TRIGger:SOURce EXT | TTLT | ECLT remains assigned
to that source until the switchbox trigger source is changed to BUS,
HOLD, or IMMediate. When the source is changed, the trigger source is
available to the next switchbox that requests it (with a TRIGger:SOURce
ECLTn command). If a switchbox requests a trigger already assigned to
another switchbox, an error is generated.
Using Bus Triggers: To trigger the switchbox with TRIGger:SOURce BUS
selected, use the IEEE 488.2 common command *TRG or the GPIB
Group Execute Trigger (GET) command.
“Trig Out” Port Shared by Switchboxes: See the OUTPut command.
Related Commands: ABORt, [ROUTe:]SCAN, OUTPut
*RST Condition: TRIGger:SOURce IMMediate
Example Scanning Using External Triggers
This example uses external triggering (TRIG:SOUR EXT) to scan bank
0, channels 0 through 7 of a single-module switchbox. The trigger source
to advance the scan is the input to the "Trig In" on an E1406A Command
Module. When INIT is executed, the scan is started and bank 0, channel
0 is closed. Then, each trigger received at the "Trig In" port advances the
scan to the next channel. For the example, ROUTe:SCAN:MODE and
ROUTe:SCAN:PORT default values of NONE are used.