Baldor MIN1853 9 & 25 Pin RS-232 Cable Connections for UL Installations, RS-232 PC Connections

RS–232 PC Connections

A null modem connection must be made between the LinStep+ 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 3-8. Maximum recommended length for RS232 cable is 6 ft. (1.8 meter).

Figure 3-8 9 & 25 Pin RS-232 Cable Connections for UL Installations

RS232/Keypad Connector

	+5V	+5V
LinStep+	RXD	RXD	Computer
			COM
	TXD	TXD
(DCE)			Port
	GND	GND	(DTE)
	Chassis

If required, RTS, CTS, DSR and DTR may also be connected for a full null modem connection.

Jumper	9 Pin	25 Pin
RTS to CTS	7 to 8	4 to 5
DSR to DTR	4 to 6	6 to 20

9 Pin Connector

Pin Signal

2RXD

3TXD

5 GND

25 Pin Connector

Pin Signal

2RXD

3TXD

7GND

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

RS232/Keypad Connector

	+5V	+5V
Control	RXD	RXD	Computer
			COM
(DCE)	TXD	TXD	Port
	GND	GND	(DTE)
	PE	PE

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.

MN1853 Receiving & Installation 3-7