Publication No. 980855 Rev. A 1256 User Manual
EADS North America Test and Services SCPI Command Basics 5-19
data in state 0. This effectively tells the 1256 to open all relays
at power-up
. This default may be overwritten by placing all relays
in the desired power-up state, and then executing the command.
*SAV 0
In the manner indicated earlier, a separate SYSTEM:NVUPD
command must follow to actually update the non-volatile memory.
If new relay modules are added to the system after the *SAV 0
command has been executed, the new relay modules will not be
programmed at power-up. Also, if module addresses are changed
after the execution of the *SAV 0 command, the modules whose
addresses have changed will not be programmed.
In general, whenever new modules are added, or module
addresses are changed, then the *SAV 0 command should be
used to place the relays of the new modules into the desired
power-up state.
*SPE Command
The status byte is returned to the controller in response to a Serial
Poll Enable (SPE) message.
The status byte carries the following information:
Bit Number
Bit Value
Description
1 (LSB)
1
Unused
2 2
Unused
3 4
Unused
4
8
Scan list at break point
5 16
Ready
6 32
Programming
error
7 64
Service
requested
8 (MSB)
128
Unused
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