B&B Electronics Zlinx 485 - Manual (Page 46)

Serial Connections
Manual Documentation Number: Zlinx485m-1808
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Figure 41. Zlinx 485 Base Module Terminal Block Pin-out for RS-485 Two-Wire Operation
Signal Name Label Direction Terminal
DataA (-) TDA(-) In/Out 1
DataB (+) TDB(+) In/Out 2
Not used RDA(-) --- 3
Not used RDB(+) --- 4
Signal Ground (COM) COM --- 5