National Instruments NI-488.2 EADR (3), EARG (4)

Appendix C Error Codes and Solutions
NI-488.2 User Manual for Windows C-4 www.natinst.com
EADR (3)
EADR occurs when the GPIB interface is CIC and is not properly
addressing itself before read and write functions. This error is usually
associated with board-level functions.
EADR is also returned by the function ibgts when the shadow-handshake
feature is requested and the GPIB ATN line is already unasserted. In this
case, the shadow handshake is not possible and the error is returned to
notify you of that fact.
Solutions
Possible solutions for this error are as follows:
•Make sure that the GPIB interface is addressed correctly before calling
ibrd, ibwrt, RcvRespMsg, or SendDataBytes.
•Avoid calling ibgts except immediately after an ibcmd call.
(ibcmdcauses ATN to be asserted.)
EARG (4)
EARG results when an invalid argument is passed to a function call. The
following are some examples:
•ibtmo called with a value not in the range 0 through 17.
•ibeos called with meaningless bits set in the high byte of the second
parameter.
•ibpad or ibsad called with invalid addresses.
•ibppc called with invalid parallel poll configurations.
•A board-level traditional NI-488.2 call made with a valid device
descriptor, or a device-level traditional NI-488.2 call made with a
board descriptor.
•A multi-device NI-488.2 call made with an invalid address.
•PPollConfig called with an invalid data line or sense bit.
Solutions
Possible solutions for this error are as follows:
•Make sure that the parameters passed to the NI-488.2 call are valid.
•Do not use a device descriptor in a board function or vice-versa.