3-10 Receiving & Installation MN1853

Figure 3-13 RS485 4 Wire Multi-Drop for UL Installations

*Terminating resistor TR is 120 W typical value. Only

the PC and last control are terminated.

TX+
TX
DGND
GND
TX+
TX
Shields
DGND
GND
*
RX+
RX
DGND
GND
TR
*TR
TX+
TX-
RX+
RX-
RX+
RX-

Use twisted pair shielded cable

with an overall shield.

P= Twisted Pair
P
P
Shields
*
TR
*TR
First
Unit
Last
Unit

PC / Host

Device

Figure 3-14 RS485 4 Wire Multi-Drop for CE Installations

*Terminating resistor TR is 120 W typical value. Only

the PC and last control are terminated.

TX+
TX
DGND
GND
TX+
TX
DGND
GND
*
RX+
RX
DGND
GND
TR
*TR
TX+
TX-
RX+
RX-
RX+
RX-

Use twisted pair shielded cable

with an overall shield.

P= Twisted Pair
P
P
PE
PE
PE
PE
*
TR
*TR
First
Unit
Last
Unit

PC / Host

Device

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.