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Connecting to the Host’s RS-422A/485 Port Section 5-2
Setting the Front Switches
Connecting to a CPU Unit 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.
*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-@).
I/O port selector switch
RS-422A
• Unit # (SW3, SW4)
Set these switches to 0.
• Communications condition setting (DIP SW1)
Set this switch to OFF.
- 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
• I/O port selection (selector switch)
Set this to RS-422A.
RS-232C
• Terminator setting (selector switch)
Set this to ON.
Communications port 1
(RS-232C)
Communications port 2
(RS-232C/RS-422A)
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.
Item Setting at Host
Communications speed
Set the same speed as for the NT631/NT631C.
(*1)
Stop bit 2 stop bits
Parity Even
Data length ASCII 7 bits
Unit # 00