Chapter 1 Introduction 5
Current-loop interface
Signal driver/Receiver: 6N136
Signals: TxD+, TxD-, RxD+, RxD-
Current value: 20 mA (Standard)
Mode: Asynchronous, full duplex
Baud-rate: 50 to 57600 bps
Opto-isolators: HllL1
Transmission distance: 1000 m
