Dual gpib cards in the same network with NT4

Question

Is it possible to use 2 Pc as masters on the same GPIB network. For now we have to disable CIC for the PC that is inactive but this is awkward since we allways have to log in to both PC's.
BRG Anders Olme

Answer 1

If you are not the controller-in-charge, you will not be able to perform any "Controller" duties. Controller duties are primarily to send command bytes (determine the flow of information by defining talkers and listeners). Therefore, you will not be able to do the following:
1) Perform ANY device-level call. These address the bus by sending the appropriate command bytes, then they may send or receive data bytes
2) Perform the ibcmd board-level call. This sends command bytes.
3) Perform ibsic or ibsre -> These are both System Controller calls.
You can:
1) Invoke any other board-level call. This includes ibrd and ibwrt.
2) Invoke some 488.2-style calls. This includes SendDataBytes and RcvRspMsg, but not Send or Receive.
You have two options to get your system working:
1) The controller can address the non-controller to talk and the device to listen and then the non-controller can send the data bytes. Similar things exist for receiveing data
2) You can design your system such that the controller will "pass control" (see ibpct) to the current non-controller. The non-controller then becomes the controller-in-charge and can invoke any NI-488.2 method. Keep passing control back and forth to allow them to share the bus.