GPIB Communication Error

[liuhongbo11]

All experts,

I have a strange problem. I am using GPIB write to control a attenuator. Sometimes, when I send commands too quickly, GPIB write has error message, and then after that I've got to physically switch off the attenuator in order to communicate with this machine. I have tried GPIB clear and 488.2 device clear. They all don't work.

Could anybody here to help me out please?

Thanx in advance.

All the best,

Liuhongbo

[danielmechanics]

Hi, maybe you can try this

Problem 1 :
Use a wait for the multiple sending of command in your VI

Problem 2
As for the clearing of the remote status, maybe you can use the GPIB misc icon. All under the GPIB palette.
For the string cmd, you can use "rsc 0" and then write another one "sre 0"

This rsc 0 string is to Release System control
The sre 0 string command is to clear remote enable of the instrument

[danielmechanics]

Hi, maybe you can try this

Problem 1 :
Possible solution :Use a wait for the multiple sending of command in your VI

Problem 2
As for the clearing of the remote status, maybe you can use the GPIB misc icon. All under the GPIB palette.
For the string cmd, you can use "rsc 0" and then write another one "sre 0"

Possible Solution :
"rsc 0" string is to Release System control
"sre 0" string is to clear remote enable of the instrument

[liuhongbo11]

Dear Regular,

If I am right, GPIB mis requires to be a system controller status when sending command sre 0/1. However sending rsc 0 is to release system control.

Liuhongbo

[danielmechanics]

Good Day,
Thankz dude, maybe you just have to wait for someone out there who knows more than 😃 If you want to be the system controller just write rsc 1

Cheers

[Shawn B.]

Liuhongbo,

What is the error message that GPIB write returns? This might give us some idea of what is going wrong.

Shawn B.
National Instruments

[liuhongbo11]

Thanx guys,

The error message is GPIB write.vi time out. I have tried to use NI explore to talk to the machine, it doen't seem the communication can go through. I believe if that happens, there is nothing software can do about it. Pls correct me if I am wrong.

Thank all of you guys very very much for trying to help me out. 🙂

Take care,

Liuhongbo