User-Defined Ttl Input/Output - HP 8712ET User Manual Supplement

CAUTION
Operator Interaction
User-Defined TTL Input/Output
User-Defined TTL Input/Output
The USER TTL port can be used as a general-purpose input or output.
Like the LIMIT TEST IN/OUT line, the USER TTL IN/OUT line is an
open-collector drive. When used as an input, the state of the USER TTL
IN/OUT line can be read with either the SCPI command
"DIAG:PORT:READ? 15,1"
or with the IBASIC command
I = READIO(15,1)
When used as an output, the state of the USER TTL IN/OUT line can be
set with either the SCPI command
"DIAG:PORT:WRITE 15,1,value"
or with the IBASIC command
WRITEIO 15,1;value
The USER TTL IN/OUT port can also be used in conjunction with an
external switch for softkey auto-stepping, or as a "sweep out" port. Be
sure that USER TTL IN/OUT port is configured properly for
general-purpose I/O by pressing
User TTL Config Default
SYST:COMM:TTL:USER:FEED DEFAULT
Be sure to observe static precautions when using this port.
3-18
SYSTEM OPTIONS
. Or use the following SCPI command:
Automating Measurements
System Config