California Instruments 2001RP, User And Programming Manual

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User and Programming Manual - Rev N
8.7 Trouble Shooting - IEEE-488 / GPIB
This section provides guidelines for resolving communication problems that may occur when
using the 2001RP with or without the PGUI32 software with a IEEE-488 / GPIB interface.
Symptoms:
1. Unable to verify connection to the power source through IEEE-488 interface. Time-out
occurs any time an attempt is made to verify connection.
2. Communication seems to work but Error 100, Command Errors occur when sending a
series of setup commands to the AC source.
Things to check first:
1. Is the 2001RP interface option set to use the IEEE-488 interface instead of the RS232C
interface? The DIP switch on the rear panel is used to select the desired interface mode.
Refer to section 8.3.
2. Does the bus address selected in the System, Interface dialog match the address set using
the DIP switches on the 2001RP? The GPIB address selected must match the settings on
the DIP switch. If changes are made to the DIP switch setting, the 2001RP power must be
cycled off and on to have the new settings take effect.
3. Did you connect the cable in correctly and are both ends of the GPIB cable securely tied
down?
Resolution for Symptom 1
When using a fast IEEE-488 bus controller, the 2001RP’s IEEE-488 interface may not
handshake fast enough to satisfy the controllers timing requirement. If this is the case, a time-
out will result any time a command is sent to the power source. To rectify this situation, the
IEEE-488 controller must be set to use delayed bus timing. For National Instruments GPIB
controller cards running under Windows™, this can be done from the device manager.
Select the GPIB interface and click on the NI-488.2M Settings tab. An Advanced button at the
bottom of the screen will provide access to the Bus Timing parameter. Set this value to 2
µ
sec to
operate with the 2001RP GPIB
interface.
Figure 8-7: NI AT-GPIB/TNT Settings
Figure 8-8: NI AT-GPIB/TNT Advanced
Settings Dialog
70 April 2007 2001RP