X6 RS232 / 485 Connections

RS232

A null modem cable (also called a modem eliminator cable) must be used to connect the control and the computer COM port. This will ensure that the transmit and receive lines are properly connected. Either a 9 pin or a 25 pin connector can be used at the computer, Figure 3-21. Maximum recommended length for RS232 cable is 3 ft. (1 meter).

Figure 3-21 9 & 25 Pin RS-232 Cable Connections for UL Installations

9 Pin Connector

Pin

Signal

2

RXD

3

TXD

5

GND

 

25 Pin Connector

Pin

Signal

2

RXD

3

TXD

7

GND

Null Modem Cable Connections

X6

RXD

Control TXD

(DCE) GND

Chassis

RXD

Computer

TXD COM

Port

GND

(DTE)

Figure 3-22 9 & 25 Pin RS-232 Cable Connections for CE Installations

Null Modem Cable Connections

X6

RXD

Control TXD

(DCE) GND

PEPE

RXD

Computer

TXD COM

Port

GND

(DTE)

Note: For CE installations, connect the overall shield at each end of the cable to PE. The voltage potential between the PE points at each end of the cable must be Zero Volts.

3-16 Receiving & Installation

MN1851

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Baldor MN1851 manual X6 RS232 / 485 Connections, Null Modem Cable Connections, Control TXD, Computer, Port