Measurement Computing Micro 488/EX rev.2.1 - Manual (Page 150)

Section 5 Command Descriptions
5.80
Address change 6 2 G0: Address status change has not occurred.
G1: Address status change has occurred.
Addressed state 9 1 T: Talker
L: Listener
I: Idle
Service Request 11 2 S0: SRQ is not asserted.
S1: SRQ is asserted.
Error code 14 3 Enn:
Letter 'E' followed by two-digit error code.
Refer to Appendix B for Error explanations.
Triggered 18 2 T0: No IEEE Trigger command received.
T1: Received the IEEE Trigger command.
Cleared 21 2 C0: No IEEE Clear command received.
C1: Received the IEEE Clear command.
Error description 24 17 Text of error message
The Operating Mode (C or P) indicates whether or not the Micro488/EX is the
Active Controller. If the Micro488/EX Passes Control to another device, then the
Operating Mode indicator will change from "C" to "P". When the Micro488/EX
regains control, then the indicator will again be "C". If the Micro488/EX is not the
System Controller, then it will initially be a Peripheral and thus the indicator will be
"P". It will, of course, become "C" when the Micro488/EX receives control from the
Active Controller.
The Bus Address is the IEEE bus device address assigned to the Micro488/EX by
the internal hardware switch.
The Address Change (G0, G1) indicator is set whenever the Micro488/EX
transitions from the idle state to a Talker or Listener, or from a Talker or Listener state
to an idle state. It will not indicate when a change is made from a listener to a talker or
a talker to a listener. The address change is reset when STATUS 1 is read.