Hardware Style Owner's manual

Appendix A

Setting Up the DH-485 Network

A–13

Grounding and Terminating the DH-485 Network

One (only one) of the link couplers at the end of the link must have

Terminals 1 and 2 of the network connector jumpered together. This

provides an earth ground connection for the shield of the communication

cable.

Link couplers at both ends of the network must have Terminals 5 and 6 of the

link connectors jumpered together. This connects the termination impedance

(of 120Ω) that is built into each link coupler as required by the DH–485

specification. See the figure below for the proper jumpering.

End-of-Line Termination

Belden

#9842 Cable

(1219 m) 4000 ft Maximum

Jumper