Omron Programmable Terminals NT631 Setup Manual page 119

Connecting to the Host's RS-422A/485 Port
Reference:
102
Setting the Front Switches
I/O port selector switch
RS-232C
RS-422A
C200HX/HG/HE(-Z)E, CPM1, CPM2A, CPM2C, CQM1H, or SRM1
The connection method depends upon the model of PLC being used, as
shown in the following table.
PLC model
C200HX/HG/HE(-Z)E Connect to the RS-422A port (port A) on a Communications
Board.
CQM1H Connect to the RS-422A port (port 2) on a Serial Communi-
cations Board.
CPM1 Connect to the peripheral port through a CPM1-CIF11 RS-
422A Adapter.
CPM2A, SRM1 Connect to the peripheral port through a CPM1-CIF11 RS-
422A Adapter.
CPM2C Connect to the peripheral port (on a CPM2C-CN111 or
CS1W-CN114 Connecting Cable) through a CPM1-CIF11
RS-422A Adapter.
(The CPM2C-CN111 splits the Unit's Communications Port
into a RS-232C port and a peripheral port.)
• There are no Communications Boards for the C200HX/HG/HE(-Z)E in
which port B is the RS-422A port.
• There are no Serial Communications Boards for the CQM1H in which port
1 is the RS-422A port.
Section 5-2
• Host link communications method
selection (selector switch)
Set this to RS-422A.
• Communications type setting (DIP SW3)
Set SW3 to OFF.
(for host link communications)
• Host link default value settings
(DIP SW4)
To effect the existing DIP switch
settings, set SW4 to ON.
To effect the values set in the PLC
Setup, set SW4 to OFF.
Note
For CPU Units manufactured before or
during June 1995 (lot No. @@65), the
existing DIP switch settings differ from
the PLC Setup default values as follows.
- Existing DIP switch settings:
2,400 bps, 1 stop bit, even parity, 7 bit
data length
- PLC Setup default values:
9,600 bps, 2 stop bits, even parity, 7
bit data length
For CPU Units manufactured from July
1995 onward (lot No. @@75), the
stipulated values in the DIP switch
settings also are 9600 bps and 2 stop bits
• Terminator setting (DIP SW6)
Set this switch to ON.
(Set terminator ON.)
Connection method