Omron NT31 NT31C Setting the Front Switches, Connecting to a CPU Unit CVM1/CV-series -EVj CPUs

Connecting to the Host’s RS-422A/485 Port Section 5-2

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

@Unit # (SW3, SW4)

Set these switches to 0.

@I/O port selection (selector switch) Set this to RS-422A.

@Communication condition setting (DIP SW1) Set this switch to OFF.

Communication is executed in accordance with the CPU bus unit system settings made at the PC. The initial values for the system settings are as follows.

-Communications speed: 9,600 bps

-Parity: Even

-Xon/Xoff control: Not executed

-Communication method: Full duplex

-Stop bits: 2 stop bits

-Data length: 7 bits

@Terminator setting (selector switch) Set this to ON.

Connecting to a CPU Unit

CVM1/CV-series (-EVj) CPUs

•CV500-CPU01-EV1/CV1000-CPU01-EV1/CV2000-CPU01-EV1

•CVM1-CPU01-EV2/CVM1-CPU11-EV2/CVM1-CPU21-EV2

PC Setup

When connecting to a CVM1/CV series CPU, set the following communication conditions for the PC Setup.

Item	Setting at Host
Communications speed	Set the same speed as for the NT31/NT31C. (*1)
Stop bit	2 stop bits
Parity	Even
Data length	ASCII 7 bits
Unit #	00

*1 Set the host link communications speed at 9600 bps or 19200 bps with the Comm. Speed memory switch at the NT31/NT31C. For details, refer to Setting the Host Link Method (page 158).

Either set PC Setup directly from a Programming Device (e.g. SYSMAC support software), or transmit the PC Setup made at a Programming Device to the CPU.

For details on the PC Setup, refer to the SYSMAC CVM1/CV500/CV1000/

CV2000 Operation Manual: Ladder Diagrams (W202-E1-j).

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