U511 User’s Manual Remote Mode Operations
Version 1.1 Aerotech, Inc. 6-1
CHAPTER 6: REMOTE MODE OPERATIONS
In This Section:
• Introduction......................................................... 6-1
• Troubleshooting Remote Communications......... 6-2
• Command Handshake Mode (RS-232 Only) ...... 6-2
• Remote Commands............................................. 6-2
• UNIDEX 511 Remote Timing.......................... 6-26
• C Program Example ......................................... 6-27
6.1. Introduction
The UNIDEX 511 can be completely controlled remotely from a PC. The U511 has three
communications ports, COM1, COM2 and an optional General Purpose Interface Bus
(GPIB) interface. Remote commands can be sent from both serial ports and the GPIB port
at the same time. Remote commands are sent in ASCII format to the U511 followed by an
end of string (EOS) character. Some commands cause the U511 to return data. This data
is in ASCII format terminated by the EOS character set by the port parameter (parameters
612, 621, and 627).
6.1.1. GPIB IEEE-488 Interface
The GPIB is the IEEE-488 standard parallel interface used for attaching sensors and
programmable instruments to a computer. The U511’s GPIB interface is activated when
the GPIB system controller addresses the U511 to become a talker or listener. Only the
EOS character is required to terminate commands to the U511. The Interface Clear (IFC)
and Device Clear (DCL) GPIB functions reset the U511’s interface. These commands can
be used to recover if a communications time out occurs.
The GPIB interface does not use the software handshake ACK/NAK characters
except during file transfers.
In U11 emulation mode, the DCL function causes a hardware reset.
6.1.2. RS-232 (COM1 and COM2) Interface
There are two RS-232 interfaces (COM1 or COM2). The U511 can be controlled through
either RS-232 interface. It can be connected to a PC with a one-to-one 9 pin D to 9 pin D
cable. These interfaces do not use hardware handshake signals.
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