Daun Yeagley wrote: > Hi David > > Don't worry about all the level stuff. That's internal to the box (59306). > The only thing you need to worry about is how to generate the proper > commands on the bus for your particular H/W-S/W combination. > But looking at the example program, one sends
* "?" to clear all listeners * "%" to listen * The commands to set relays, such as "B123", or "A1" * REN=H to reset to local control. But all 4 combinations have different TTL levels on the control lines. On my bench multimeter, something as simple as dd=ibdev(0, gpib_address, 0, T3s, 1, 0); /* open a device at address 'gpib_address' with 3 s timeout. */ ibclr(dd); /* Clear it */ ibwrt(dd,"PRESET",6); /* Can't recall what this command did on my meter, but it works! */ ibwrt(dd,"DCV",3); /* Set to DC voltage. Command ends in 3, as DCV is 3 characters */ will set it to DC voltage. If I want frequency, the last command would be ibwrt(dd,"FREQ",4); /* ends in 4, as FREQ is 4 characters */ But this HP 59306A relay actuator will *not* respond similarly if I send ibwrt("A1",2); /* Unsuccessfully try to join contacts A-C on relay 1 */ In various attempts, I've managed to get the odd click from the relays, but nothing useful is happening. I've got two of these, and neither is doing what I expect, so I suspect the units are not faulty, but just my bad programming. > In hopefully simple terms, you need to address the 59306 as a listener, and > then send the ASCII string that represents the relay state you need. In > Didier's example: > >> 1) to turn all channels off, send "B123456" >> 2) to turn channel 1 on: send "A1" >> > > You don't need (or want an end of line sequence or anything). When done > sending the command, just unaddress it. > Perhaps that is what I am doing wrong. I am not un-addressing it. But I've never had to before. I've normally on other instruments just sent the command via ibwrt(), then read responses with ibrd(). For this instrument, I don't believe there is anything that can be read - you can't for example read the state of the relays, so I don't think there is any need for using ibrd(). > Hope that removes a bit of fog. > > Daun > > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.