RS-232C
ZX-GT User’s Manual
100
RS-232C
Communications on the RS-232C Interface
You can use the RS-232C connector of the Interface Unit to perform serial communication
with external devices such as a PC or PLC.
Communications Interface Specifications
This interface allows data communications compliant with the EIA RS-232C standard up
to a maximum speed of 38400 bps.
Communications on the RS-232C interface p.80
Communication Method
The ZX-GT uses the "command response method."
By this method, command processing is executed when a command is sent to the
Controller from an external device, and a response is returned to the external device from
the Controller, when command processing ends. An error response is returned when the
command sent from the external device is in error or when an error occurs during
command processing on the Controller.
When commands are issued continuously, issue the next command after the response is
received.
Communication method
Full duplex
Synchronization method Start-stop
Transmission code
ASCII
Baud rate
1200, 2400, 4800, 9600, 19200, 38400 (bps)
Data length
7, 8 (bits)
Stop bit
1, 2 (bits)
Parity
NONE (none), ODD (odd), EVEN (even)
Header/footer
ST.ET (STX+ETX), CR, CR.LF (CR+LF)
Controller
External device
Command
Response
Command
processing
zx_gt.book Page 100 Wednesday, May 30, 2007 3:29 PM
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