| Features | 　 |
Able to convert RS-232 signal to RS-485 balanced differential signal and extend the communication distance to 1.2km
Uses a particular pump to gain power from RS-232 signal (RTS, DTR, TXD) without initializing the RS-232 series interface
This interface converter does not require any AC or DC power |
| General Specs | 　 |
| Brand & Model | STM485S |
| Material | ABS |
| Serial port feature | Concurrently compatible with RS-232C, RS-485 standard of EIA/TIA |
| Electric interface | D89 hole interface of RS-232 end, DBP pin connector of RS-485 end, compatible with post (4 or 5 connection) |
| Work methods | Asynchronous half duplex, differential transmission |
| Transmission media | Common wire, double wire or UTP or shielding Line |
| Transmission rate | 300~115200bps |
| Transmission distance | 5 meters (RS-232 end) 1.200 meters (RS-485 end) |
| Tel-communication agreement | Transparent |
| Work environment | -10°C to 85°C, relative humidity: 5% to 95% |
| Signals | RS-232: TXD, RXD, RTS, CTS, DTR, DSR, DCD, CND; RS-485: Date+ , Date, Date. GND |
| Dimensions | 95 x 33 cm x 17 mm |