Product name:

UOTEK Industrial RS-232 to RS-485/422 Converter with Isolation

Model: UT-503

Standards: RS-232C/ RS-485, /RS-422 EIA/TIA

● RS-232 DB9 female connector input; RS-422/485 10 bits terminal block output

● Port protection: RS-232 ±15KV ESD protection; RS-422/485 each line 600W surge, lightning protection

● Isolation: isolated voltage 2,500VRMS 500VDC

● Working mode: asynchronous half-duplex or full-duplex

● LEDs for indicating PWR TXD, and RXD activity

● Transmission media: twisted-pair or shielded cable

● Baud rate: 115.2Kbps to 300m

                38.4Kbps to 2.4Km

                9,600bps to 5Km

● Dimension: 117×80×25mm

● Operating temperature: -40℃ to 85℃

● Relative humidity: 5% to 95 % (Non-condensing)

● Transmission distance: 0-5,000m(115,200bps-9,600bps)

UT-503 is an industrial converter with optoelectronic isolation. It complies with RS-232C, RS422, and RS-485 standards; it converts single side RS-232 signal to a balanced differential RS-422 or RS-485 signal. The built-in optoelectronic isolator can provide as high as 2,500Vrm isolated voltage; the fast instant voltage restraint is designed to protect RS-422/RS-485 interface; it adopts advanced TVS (TRANSIENT VOLTAGE SUPPRESSOR) instant voltage restraint; 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; with this, the voltage on both sides are fixed at presupposed value, protects the component of circuit from damage. This voltage restraint provides 600W each wire with lightning and ESD protection, and surge voltage, instant overvoltage protection on circuit which causing by all reasons; the tiny interelectrode capacitance ensures high speed transmission for RS-422/485 ports. RS-232 connects with RS-232C standard port by DB9 female connector; RS-422/RS-485 adopts 10 bits terminal block as output. This converter is with 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); there is no need jumper wire setting for full duplex (RS-422) and half duplex (RS-485) mode, plug & play. It is compatible with current communication software and hardware, no need to set the previous working mode which base on RS-232.


UT-503 industrial optoelectronic isolated converter provides connection for point to point, point to multipoint communication. For point to multipoint mode, each converter is allowed to connect 128 sets RS-422 or RS-485 device with baudrate 300-115.2Kbps. The power and data flow indicators indicate the working status.