Omron NT631C manual 100

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

Connecting to a CVM1/CV- series Host Link Unit

CVM1/CV-series Rack-mounting Unit: CV500-LK201

ACVM1/CV-series Host Link Unit (CV500-LK201) has two connectors (com- munications ports 1 and 2). To use the RS-422A host link method, set com- munications port 2 to RS-422A.

Communications port 2 is a 9-pin connector which allows selection of the RS- 232C or RS-422A method. When this port is used with the RS-422A method, the I/O port selector switch on the front of the Unit must be set to RS-422A (the lower position).

CPU Bus Unit Settings

When connecting to a CVM1/CV-series Host Link Unit, set the following com- munications conditions for the CPU Bus Unit settings.

Item	Setting at Host
Communications speed	Set the same speed as for the NT631/NT631C. (*1)
Transfer code	ASCII, 7 data bits, 2 stop bits
Parity	Even
1-to-1/1-to-N	1-to-N(*2)
Instruction level	Level 1, 2, 3

*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).

*2 The 1-to-N setting enables BCC (Block Check Character). It is not actually possible to connect more than one NT631/NT631C in a single host link.

Set the CPU Bus Unit settings directly from a Programming Device (e.g. CX- Programmer).

For details on the CPU Bus Unit settings, refer to the SYSMAC CVM1/CV- series Host Link Unit Operation Manual (W205-E1-@).

100