Omron Programmable Terminals NT631 Setup Manual page 118

Connecting to the Host's RS-422A/485 Port
Connecting to a CPU Unit
Setting the Front Switches
Communications port 1
(RS-232C)
Communications port 2
(RS-232C/RS-422A)
I/O port selector switch
RS-232C
RS-422A
CVM1/CV-series (-EV@) CPU Units
• CV500-CPU01-EV1/CV1000-CPU01-EV1/CV2000-CPU01-EV1
• CVM1-CPU01-EV2/CVM1-CPU11-EV2/CVM1-CPU21-EV2
PLC Setup
When connecting to a CVM1/CV-series CPU Unit, set the following communi-
cations conditions for the PLC Setup.
Item
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 memory switch at the NT631/NT631C. For details, refer to 6-
7-2 Setting the Host Link Method (page 155).
Either set the PLC Setup directly from a Programming Device (e.g. CX-Pro-
grammer), or transmit the PLC Setup made at a Programming Device to the
CPU Unit.
For details on the PLC Setup, refer to the SYSMAC CVM1/CV500/CV1000/
CV2000 Operation Manual: Ladder Diagrams (W202-E1-@).
• Unit # (SW3, SW4)
Set these switches to 0.
• I/O port selection (selector switch)
Set this to RS-422A.
• Communications condition setting (DIP SW1)
Set this switch to OFF.
Communications are executed in accordance with the
CPU Bus Unit system settings made at the PLC. The
initial values for the system settings are as follows.
- Communications speed: 9,600 bps
- Parity: Even
- Xon/Xoff control: Not executed
- Communications method: Full duplex
- Stop bits: 2 stop bits
- Data length: 7 bits
• Terminator setting (selector switch)
Set this to ON.
Setting at Host
Set the same speed as for the NT631/NT631C.
2 stop bits
Even
ASCII 7 bits
00
Section 5-2
(*1)
101