RS232 to RS422/RS485 Converter

This converter realizes RS-232-RS-485/422 active isolation conversion, based on FPGA design, and uses 2500V isolation voltage DC-DC isolation power supply, does not use serial port stealing technology, and the communication signal uses high-speed optocoupler isolation.

The device has its own line short circuit and data error detection functions. The RS485/422 interface has three levels of lightning protection, and the communication distance is up to 1800 meters, which is widely used in complex industrial systems.

● Based on FPGA design, it can automatically generate a precise RS485 transceiver switch enable signal according to the sent data, and can automatically detect and control the RS-485 data stream. The performance is far better than the ordinary Schmitt trigger enable generation method;

● Unique interface adaptive technology, no need to switch settings, freely switch RS-485/RS-422 interfaces;

● Built-in line short circuit detection and data error detection function, can detect the line A and B short circuit in RS485, or T+ and T- short circuit and R+ and R- short circuit in RS422, and has indicator lights to indicate it, and can detect the received data error ( The data received by some nodes when the connection 0 is greater than the minimum baud rate (300) for the longest connection 0 time);

● RS232-RS485/422 baud rate 300-115.2K and 300-921K adaptive two products are optional;

● Adopting isolation voltage 2500V DC-DC power supply, not using serial port to steal electricity, which improves the applicability of the equipment, and the communication signal is isolated by high-speed optocoupler;

● Serial port interface three-level lightning protection, anti-radar to IEC61000-4-5 (8/20μS) 6KV, impedance (2Ω) standard;

● Wide input voltage range (DC9-55V, AC7-43V), and can automatically detect the polarity of the DC power supply, and built-in self-recovery fuse; support overload protection, anti-reverse protection;

● Meet the requirements of industrial level 4 electromagnetic compatibility;

● Super lightning protection function: lightning protection, anti-inductive high voltage, anti-surge, etc.;

● Rail or wall-mounted installation;

● Wide temperature type: working temperature -40℃~ +85℃;

● All models have passed the 100% baking machine test.

● Serial interface          

Standard

EIA/TIA-232 RS-232 (ITU-T V.28)

EIA/TIA-422 RS-422 (ITU-T V.11)

EIA/TIA-485 RS-485 (ISO/IEC8284)

Serial port Interface:

Interface:

RS-232：socket DB9；

RS-422：4-wires；

RS-485：2/4-wires

Followed：SG  = Signal Ground

RS-232: TxD(DB9-2), RxD(DB9-3), SG(DB9-5)

Internal loop：RTS to CTS，DTR to DSR and DCD

RS-422: TxD+, TxD-, RxD+, RxD-, SG

RS-485 4 wires: TxD+, TxD-, RxD+, RxD-, SG

RS-485 2 wires: A(corresponding TX+),B（corresponding TX-）,SG

RES+,RES-: terminal 120 Ω match resistance enable. The matching resistance device is built-in, and RES+ and RES- can be short-circuited when in use.

● Indicator lights           

● Environmental indicators 

working temperature: -10 ℃ – +60 ℃

Storage temperature: -40 ℃ – +85 ℃

Working humidity: 0% -95% ( no condensation)

MTBF: > 100,000 hours