Rockwell-automation 1758-RTU202 DataSite Hardware User Manual User Manual download pdf (Page 36)

Publication 1758-UM001D-EN-P - June 2011

36 Wiring the Controller

RS232 DB-9P Connector

When using RS232 serial connection, connect the interface COM of PC and

interface COM1 or COM2 of controller with data cables of 9-pin standard

connector (DB-9P).

In the following table an EFFECTIVE level means a voltage of +3V or

greater; a LEISURE level means a voltage of –3V or less.

Stop bits 1 or 2 bits

Communication protocol Modbus RTU, Modbus ASCII, DNP3

Protocol mode Master, Slave (DNP3 supports only slave mode.)

Connecting type DB-9P

Pin Assignments for RS232 Connector

Pin Function Type Description

Pin 1 DCD NC This pin is not connected.

Pin 2 RXD Input LEISURE for being in waiting state.

EFFECTIVE for receiving data, and the RXD LED will be

blinking.

Pin 3 TXD Output LEISURE for being in waiting state.

EFFECTIVE for transmitted data, and the TXD LED will be

blinking.

Pin 4 DTR NC This pin is not connected.

Pin 5 GROUND GND This pin is connected to the system ground.

Pin 6 — NC This pin is not connected.

Pin 7 RTS Output EFFECTIVE if full duplex operation is selected for the port.

EFFECTIVE just before and during transmission of data if

half duplex operation is selected.

LEISURE when no data is being transmitted.

RTS LED is lighting for an EFFECTIVE level.

Serial and protocol communication parameters (Continued)

Parameter Engineering value

GND

CTS RTS

TxD RxD

432

9876

44377

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Rockwell-automation 1758-RTU202 DataSite Hardware User Manual User Manual Page 36