RS-232 system communication extending modules. Auto sense serial ratetransmission rate, no external power needed. Ideal for use in noisey environments. Transmission distance at 9,600bps is 2,000m, stable performance. Model RS232D has 2500 volts of isolation twice the rating of most isolators to protect RS-232 equipment from lightning strikes, accidental high voltage shorts and ground loops.
Features:
1. Extend RS-232 signal 2Km
2. Plug-and-play
3. Port-powered, lowest consumption
4. Auto sense serial signal rate
5. Isolation serial device(RS-232)
6. 2500V isolation
Specifications:
Performance parameter
Standard: EIA RS-232 standard
RS-232 signal: TXD,RXD, GND
Working: Asynchronous, point to point
Transfer rate: 300-115200bps,auto sense serial signal rate
Isolate signal: TXD,RXD, GND
Transfer distance: 2Km(9600bps)
Isolation: 2500V
Port type: DB9F, DB9M(wire)
Power
Input powered:No power supply needed, powered from TXD, RTS, DTR signal in RS-232 port
Consumption:Static consumption less than 10mA,dynamic consumption less than 40mA
Environment
Working environment: -10°C to 60°C
Storage temperature: -40°C to 85°C
Relative humidity 5% to 95%
Appearance
L×W×H: 90mm×33mm×16.5mm (DB9)
Shell: Plastic
Color: White
Weight:30g (DB9)
Approvals: FCC,CE, RoHS approvals

Sold as a pair. 2 x modules as pictured.