Remote Mode Operations U511 User’s Manual
6-12 Aerotech, Inc. Version 1.1
6.4.10. Q: Serial Pol command
This is the Serial Pol status byte initiated by a “Q” command in RS-232 mode or a Serial
Pol GPIB function. UNIDEX 511 is requesting service if bit number 6 is set. Reading the
Serial Pol byte clears this bit. Bit assignments are as shown in Table 6-17.
Table 6-17. Status Byte Bit Assignments
Bit Function
bit 0: 1 = communications port error: break, frame, parity, or overrun error
This bit indicates that a communications error has occurred and
the communications port is unreliable at the selected baud rate.
Try decreasing the baud rate. A shielded cable should always
be used. Cleared after read.
bit 1: 1 = program is currently running
bit 2: 1 = program execution error / Immediate command error (I...). Set when:
1. program runtime error
2. Immediate command syntax error (I...)
This bit is cleared when a new program is loaded or a new
Immediate (I...) command is sent to the controller. Use the “PE”
command to get an ASCII error message.
bit 3: 1 = illegal remote command
An illegal remote command was sent to the U511 or a syntax error
occurred with that command. The Serial Pol command (Q) in RS-
232 mode or the Serial Pol function in GPIB mode clears this bit.
Use the “PE” command to get an ASCII error message.
bit 4: 1 = axis fault
An axis fault occurred (i.e., position error, RMS current error, limit,
etc.). This bit is cleared by the Fault Acknowledge command (IFA).
Use the “PE” command to get an ASCII error message.
bit 5: 1 = command is executing
bit 6: 1 = service request pending
bit 7: 1 = any error
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