Omron CP1H CPU Operation Manual page 723

Cp1h cpu unit

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Connections to Serial Communications Option Boards

Connections for Host Link Communications

Port connections for Host Link communications are shown in the following table. Up to 32 nodes can be con-

nected for 1:N connections.

PLC: C-mode or

PLC: C-mode or

(1) Four-wire connections must be used for RS-422A/485 connections with Host Link communications.

(2) "Resistance ON" indicates the terminating resistance must be turned ON.

(3) "5-V power" indicates that a 5-V power supply is required for the Link Adapter. Refer to the Link

Adapter manual for details. A 5-V power supply is not required for a Link Adapter connected to an

RS-232C Option Board mounted on the CPU Unit because power is supplied from pin 6 of the con-

(4) The maximum cable length for RS-232C is 15 m. The RS-232C standard, however, does not cover

baud rates above 19.2 Kbps. Refer to the manual for the device being connected to confirm support.

Connection Examples

The connection examples in the remainder of this section show only the basic connection diagrams. We rec-

ommend that appropriate noise countermeasures be taken in actual applications, including the use of shielded

twisted-pair cables. Refer to Recommended RS-422A/485 Wiring Examples on page 707 for actual wiring

Host Computer Connections

1:1 Connections Using RS-232C Ports

• IBM PC/AT or Compatible Computers

D-sub, 9-pin

connector (male)

Schematic diagram, RS-232C ports

Resistance ON

Resistance ON

D-sub, 9-pin

connector (female)

Schematic diagram, RS-422A/485 ports

Resistance ON

(See note 1.)

Resistance ON

Resistance ON

Resistance ON

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