Baldor MN1851 manual = Twisted Pair, TX+ Dgnd GND, TX+ RX+ Dgnd GND

Figure 3-25 RS485 4 Wire Multi-Drop for UL Installations

	Host
	Computer
P	TR*	P
	RX+
= Twisted Pair	RX–
	TR*	P
	TX+
	TX-
	DGND
	GND

Use twisted pair shielded cable with an overall shield.

*Terminating resistor TR is 120 W typical value. Only the PC and last control are terminated.

X6

TX+

TX–

RX+

RX-

	DGND
Shields		GND
*T		X6
	R	TX+
		TX–
*T	R	RX+
		RX-
	DGND
Shields		GND

Figure 3-26 RS485 4 Wire Multi-Drop for CE Installations

	Host
	Computer
P	TR*	P
	RX+
= Twisted Pair	RX–
	TR*	P
	TX+
	TX-
	DGND
	GND	PE

Use twisted pair shielded cable with an overall shield.

*Terminating resistor TR is 120 W typical value. Only the PC and last control are terminated.

X6

TX+

TX–

RX+

RX-

	DGND
PE		GND
PE		X6
*T
	R	TX+
		TX–
*T	R	RX+
		RX-
	DGND
PE		GND

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.

See Section 4 of this manual for the description of switch “AS1-1 to AS1-4” for address settings for multi-drop applications.

3-18 Receiving & Installation MN1851