Technical Specifications​

RS232 interface: DB9 connector, EIA/TIA-232 compliant.

RS485 interface: screw terminal block, two-wire half-duplex differential bus according to standard configuration; four-wire option depends on version.

Baud rate: 300 bps to 115200 bps.

Data format: 5, 6, 7 or 8 data bits; 1, 1.5 or 2 stop bits; none, odd or even parity.

Isolation voltage: 2500 VDC or 3000 VDC according to version, optocoupler isolation.

Power supply: 9-30 VDC typical, 24 VDC standard; some versions support 5-24 VDC or serial-powered configuration.

RS485 distance: up to 1200 m with shielded twisted pair at suitable baud rate.

RS485 load: up to 32 standard unit loads; more nodes require repeater according to bus design.

Functional Features​

Automatic transmit/receive direction control for RS485 half-duplex operation.

Built-in 120 Ω termination resistor enabled through DIP switch according to version.

Optocoupler isolation between RS232, RS485 and power circuits.

TVS, ESD and surge protection for bus lines.

Power reverse-polarity protection according to version.

LED indicators for power, RS232 activity and RS485 activity.

Performance Parameters​

Signal conversion delay: microseconds级 according to hardware design; typical industrial converter data path below 1 ms.

ESD protection: up to ±15 kV contact discharge according to version.

Operating temperature: -20°C to +70°C according to standard industrial version; some versions list -40°C to +85°C.

Humidity: 5%-95% non-condensing.

Material Composition​

Housing: flame-retardant ABS or metal shielded enclosure according to version.

PCB: FR4 industrial board.

Isolation: high-speed optocouplers.

Terminals: copper alloy with nickel plating according to industrial converter construction.

Protection devices: TVS diodes, ESD suppressors and isolated power components.

Structural Features​

35 mm DIN-rail mounting.

Compact width suitable for control cabinet installation.

DB9 RS232 port and screw-terminal RS485 port.

DIP switches for termination, baud rate or operating mode according to version.

Front LEDs for power and communication status.

Working Principle​

The RS232 side receives asynchronous single-ended frames from a computer, PLC or device. The converter isolates and translates the data to balanced differential RS485 signals. On receive, RS485 differential bus data is converted back to RS232 levels. Automatic direction control switches the RS485 driver without external RTS/CTS hardware.

Installation Requirements​

Mount on 35 mm DIN rail inside a sealed or ventilated control cabinet.

Use shielded twisted pair for RS485 A/B wiring.

Install 120 Ω termination only at the two physical ends of the RS485 bus.

Separate RS485 and power cables from variable-frequency drive and high-current AC cables.

Connect shield to ground at one point to prevent ground loops.

Usage Precautions​

Do not reverse 24 VDC or supply polarity.

Verify A/B polarity; reversed A/B prevents communication.

Do not exceed 32 standard unit loads on one RS485 segment without repeater.

Avoid condensation, corrosive gas and conductive dust environments.

Disconnect power before plugging or unplugging DB9 connectors.