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5-2SectionConnecting to the Host’s RS-422A/485 Port
109
CQM1H CPUs or SRM1, set the following communication conditions for the PC
Setup area.
Item Setting at Host
I/O port RS-422A
Communication mode Host link mode
Communications speed Set the same speed as for the NT31/NT31C.
(*1)
Stop bit 2 stop bits
Parity Even
Data length ASCII 7 bits
Unit # 00
*1 Set the host link communications speed at 9600 bps or 19200 bps with the
Comm. Speed at the NT31/NT31C. For details, refer to Setting the Host Link
Method (page 158).
Set the PC Setup area settings directly from a Programming Device (e.g. CX-
Programmer).
For details on operations relating to the PC Setup area, refer to the manual for
the PC which is used.
The PC Setup area word numbers and settings to be made depending on the
unit to which the connection is made are shown below.
When using port A of the communication board of C200HX/HG/HE(-Z)E
Word # Writing Value Settings
DM6555 0001 Host link mode, no CTS control
Communication conditions set by the contents of DM
DM6556 0303 Data length 7 bits, 2 stop bits, even parity,
communications speed: 9600 bps
0304 Data length 7 bits, 2 stop bits, even parity,
communications speed: 19200 bps
DM6558 0000 Unit # 00
When using a CPM1, CPM2A, CPM2C, SRM1
Word # Writing Value Settings
DM6650 0001 Host link mode, no CTS control
Communication conditions set by the contents of DM
DM6651 0303 Data length 7 bits, 2 stop bits, even parity,
communications speed: 9600 bps
0304 Data length 7 bits, 2 stop bits, even parity,
communications speed: 19200 bps
DM6653 0000 Unit # 00
When using a CQM1H
Word # Writing Value Settings
DM6550 0001 Host link mode, no CTS control
Communication conditions set by the contents of DM
DM6551 0303 Data length 7 bits, 2 stop bits, even parity,
communications speed: 9600 bps
0304 Data length 7 bits, 2 stop bits, even parity,
communications speed: 19200 bps
DM6553 0000 Unit # 00