Omron NT31 Operation Manuals page 136

Connecting to the Host's RS-422A/485 Port
Reference: There are no communication boards for which port B is the RS-422A port.
C-series C200HX/HG/HE(-ZE), CPM1 CPUs, SRM1
Connect to the RS-422A/485 port (port A) of the communication board. Note
that the connection to a CPM1 or/and SRM1 must be made via an RS-422A
adapter (CPM1-CIF11).
[PC system setting area settings]
When connecting to a C200HX/HG/HE(-ZE) or CPM1 CPUs or SRM1, set the
following communication conditions for the PC system setting area.
Item
I/O port
Communication mode
Communications speed
Stop bit
Parity
Data length
Unit #
*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 175).
Set the PC system setting area settings directly from a peripheral tool (e.g. SYS-
MAC support software).
For details on operations relating to the PC system setting area, refer to the
manual for the PC which is used.
The PC system setting 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(-ZE)
Word # Writing Value
DM6555 0001
DM6556 0303
0304
DM6558 0000
When using a CPM1, SRM1
Word # Writing Value
DM6650 0001
DM6651 0303
0304
DM6653 0000
Setting at Host
RS-422A
Host link mode
Set the same speed as for the NT31/NT31C.
2 stop bits
Even
ASCII 7 bits
00
Host link mode, no CTS control
Communication conditions set by the contents of DM
Data length 7 bits, 2 stop bits, even parity,
communications speed: 9600 bps
Data length 7 bits, 2 stop bits, even parity,
communications speed: 19200 bps
Unit # 00
Host link mode, no CTS control
Communication conditions set by the contents of DM
Data length 7 bits, 2 stop bits, even parity,
communications speed: 9600 bps
Data length 7 bits, 2 stop bits, even parity,
communications speed: 19200 bps
Unit # 00
Section 5-2
(*1)
Settings
Settings
125