HESC-T-022 is a port-powered converter with photoelectric isolation. It complies with RS-232C, RS-422, and RS-485 standards. It converts single side RS-232 signal to a balanced differential RS-422 or RS-485 signal. The built-in photoelectric isolator can provide as high as 2500 Vrms isolated voltage. The fast transient voltage suppression is designed to protect RS-485/422 interface. The device 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 suppression will fastly lower the impedance from both sides, and soak in large current, therefore the voltage on both sides are fixed at pre-determined value and protects the component of circuit from damage. This voltage suppression provides 600W for each wire with lightning and ESD protection, and surge voltage and instant over-voltage protection on circuit which is caused by all reasons. The tiny inter-electrode capacitance ensures high speed transmission for RS-485/422 ports. RS-232 port connects with RS-232C standard port by DB9 female connector and RS-485/422 adopts 10-pin terminal block as output.

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 (RTS, DTR). There is no need jumper wire setting for full-duplex (RS-422) and half-duplex (RS-485) mode. The device is plug & play. It is compatible with current communication software and hardware, no need to set the previous working mode which is based on RS-232.