9. TRIGGER(GET):
Enables the 4278A to respond to a TRIGGER bus command. This command
may be sent to a selected device or to all devices addressed as listeners on the
HP-18 bus. The 4278A must be addressed to listen before the trigger message is
sent. Refer to Bit 2 of the status byte in paragraph 4-2-8 for information on
proper triggering techniques.
SEND 7; UNL MTA LISTEN 17
TRIGGER 7
UNL=UNLISTEN: unaddresses all listeners
MTA=MY TALK ADDRESS: sets the controller to talk
LISTEN: sets the instrument addressed as 17 to listen
NOTE
1. The 4278A does not have Parallel Poll capability.
2. See "BASIC Interfacing Techniques for HP 200 Computers" for a fur-
ther description of HP-lB bus commands.
4-2-6. 4278A DEVICE DEPENDENT COMMANDS
Device dependent commands are used with Option 101 that are only used for the 4278A.
This section consists of three parts:
1. Command Index:
All commands in the command index are listed in alphabetical order.
2. Command Reference:
Each command is fully explained in the command reference.
3. Command Functional Order:
In the command functional order list, all commands are listed in their functional
order. This is convenient when you are writing a program.
4-8
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