Module size: 5.0cm * 2.7cm :A power indicator and data transceiver indicator. Data status panoramic view. The module TTL side uses 5V DC power supply RXD TXD compatible 5V logic signal. RXD receiver output: If A > B 200mV, then RXD is high; If A TXD driver input: The low level forced output Y on TXD is low, while the output Z is high. Similarly, the high level on the TXD forces Y to be high and the output Z to be low. A: Receiver in-phase input B: Receiver inverting input Y: Driver in-phase output terminal Z: Driver inverting output terminal

The module adopts the MAX490 chip, with stability and communication,with a maximum of 2.5 MBPS. The module has 120 ohm terminating resistance, can reduce long-distance communication echo interference effectively. The module has a TVS diode. Anti lightning, anti peak voltage. The module has 15KV ESD protection; Add a 10 ohm overcurrent protection resistor on the board. RS422 interface, two-way communication. A B Y Z ultra-long transmission 1000 meters.