Realize half-duplex conversion from RS-232 interface to RS-485 interface. When applying RS-485 network communication, because the whole communication system is connected through RS-485 bus and each control unit is far from each other, to ensure the system reliable, RS-485 interface terminal adopts the separate driving mode in each channel and photoelectric isolation with 3500V isolating voltage to connect host-linked RS-232 with RS-485 interface terminal. The high-speed transient voltage suppresser (TVS) can effectively restrain lightening and ESD, and effectively avoid lightening strike or other interferences.

Technical Specification

• Interface characteristics:	RS-232C and RS-485 standard compatible with EIA/TIA.
  Electric Interface:	DB9 female connector of RS-232C interface and RS-485 interface module with a 10-pin terminal.
  Transferring media:	Twisted-pair or shield cable.
  Work mode:	Asynchronous half-duplex.
  Signal indicator light:	Two double-color indicator light TXD and RXD.
  Isolation voltage:	Isolated voltage 3500VRMS, 500VDC continuous.
  Transmission rate:	115.2K bps for 1.2Km, 38.4K bps for 2.4Km and 9600 bps for 5Km
  Protection grade:	+15KV ESD protection for RS-232 and 1500W lightening strikes surging protection of each line for RS-485.
  Transmission distance:	0-5Km (115200-9600bps)
  Environment:	Operating temperature: 0-60
  Relative humidity:	5%- 90%, non-condensing
  Dimension:	100mm x 70mm x 115mm