Delta TP70P-211LC1T - Page 56

TP70P-211LC1T/TP04P-20EXL1T Operation Manual
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 TP04P-20EXL1T
You can find the definitions of RS-485 ports on the product case as the image shown below, D1+, D1-, D2+,
D2- and SG. D1+ and D1- are for PLC Mode while D2+ and D2- are for TP Mode.