![background image](http://html.mh-extra.com/html/omron/nt21/nt21_setup-manual_744541086.webp)
5-1
Section
Connecting to the Host’s RS-422A/485 Port
75
CQM1H CPU Units or SRM1, set the following communication conditions for the
PC Setup.
Item
Setting at Host
I/O port
RS-422A
Communication mode
Host Link mode
Baud rate
Set the same baud rate as for the NT21.
(*1)
Stop bits
2 stop bits
Parity
Even
Data length
ASCII 7 bits
Unit #
00
*1 Set the Host Link baud rate at 9,600 bps or 19,200 bps with the Comm. Speed
at the NT21. For details, refer to Setting the Host Link Method (page 125).
Set the PC Setup settings directly from a Programming Device (e.g., CX-Pro-
grammer).
For details on operations relating to the PC Setup, refer to the manual for the PC
that is used.
The PC Setup addresses and settings to be made depending on the Unit to
which the connection is made are shown below.
When using port A of the Serial Communications 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, baud rate:
9,600 bps
0304
Data length 7 bits, 2 stop bits, even parity, baud rate:
19,200 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, baud rate:
9,600 bps
0304
Data length 7 bits, 2 stop bits, even parity, baud rate:
19,200 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, baud rate:
9,600 bps
0304
Data length 7 bits, 2 stop bits, even parity, baud rate:
19,200 bps
DM6553
0000
Unit # 00