I'm using the NI GPIB-RS232 converter box in S-Mode connected to a PLC which is sending the box command strings. When I send "rsv 65", it should turn on the SRQ signal and set bit zero of the request byte to 1. However, the SRQ light stays off. If I send "rsv" again to check the status, it replies with "65" which means bit 6 of the request byte is ON. According to the manual, asserting bit 6 turns on the SRQ line. However, when I send "lines" (status of GPIB control lines), it shows that the SRQ line is OFF which coincides with the status light also being off. So my question is: how do I turn on the SRQ control line in S-Mode?
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