HESC-T-033 is an industrial level converter with photoelectric isolation and complies with RS-232C and RS-485 standards. It converts single side RS-232 signal to two balanced differential RS-485 signals. The built-in photoelectric isolator can provide as high as 2,500 Vrms isolated voltage. The fast instant voltage restraint is designed to protect two RS-485 interfaces. It adopts advanced TVS (TRANSIENT VOLTAGE SUPPRESSOR). Normally, TVS tube is in high impedance state. When both sides of TVS tube suffer from high power impact in a sudden, the voltage restraint will fast lower the impedance from both sides, and absorb in big current. Therefore, the voltage on both sides are fixed at pre-determined value and protects the component of circuit from damage. This voltage restraint provides 600W each wire with lightning and ESD protection, and the protection to surge voltage and instant over-voltage on circuit which is caused by various reasons. The tiny inter-electrode capacitance ensures high speed transmission for RS-485 ports. RS-232 port connects with RS-232C standard port by DB9 female connector and RS-485 adopts 10-pin terminal block as connector.

This converter has built-in zero delay auto receiving and transmitting conversion and unique I/O circuit auto control data flow direction without any handshake signal (RTU, DTR).Jumper wire setting is not required for realizing half-duplex (RS-485) mode. It is compatible with current communication software and hardware, no need to set the previous working mode which is based on RS-232.

HESC-T-033 photoelectric isolated industrial converter provides connection for point-to-point, point-to-multipoint communication. For point-to-multipoint mode, each converter is allowed to connect 128 RS-485 devices with baud rate 300 bps - 115.2 Kbps. The power and data flow indicators indicate the working status.