Measurement Computing Micro 488/EX rev.2.1 - Manual (Page 149)

Section 5 Command Descriptions
5.79
STATUS
STATUS is a system command which is useful for determining which mode the
Micro488/EX is in, its current address or the type of ERROR that has occurred. At
power-up, issuing the STATUS command will cause the Micro488/EX to return the
string...
CONTROLLER 10
After issuing a PASS CONTROL or PERIPHERAL command the Micro488/EX
will respond with...
PERIPHERAL 10
If PASS CONTROL was issued and the Micro488/EX then receives control again
it will respond with....
CONTROLLER 10
This is useful for checking when control is returned after a PASS CONTROL has
been issued.
If an ERROR has occurred, as indicated on the front panel of the Micro488/EX,
issuing the STATUS command will cause an error message to be returned to the host.
Once the error message is sent by the Micro488/EX the error condition is cleared.
Refer to Appendix B for error message explanations.
The Micro488/EX also includes and extended status command, STATUS 1. The
STATUS 1 command returns various items detailing the current state of the
Micro488/EX. They are returned as one long character string as follows:
Item Starting Col. # Cols. Values
Operating mode 1 1 C: Controller
P: Peripheral
Bus address 3 2 Two-digit decimal number 00 to 30