RS232 to RS485 Serial Converter , UT-2017 with Optical Isolation
1. Interface characteristic: compatible with the standards of RS232
and RS485 issued by EIA/TIA.
2. Electric interface: DB9 female connector for RS232 interface
input end, RJ45 and 4PIN connector for RS-485 interface output end.
3. Protection grade: ±15KV ESD protection for RS232 interface, and
600W surge protection each line for RS-485 interfaces.
4. Isolation degree: isolation voltage 2500Vrms 500DC non-stop.
5. Operation mode: asynchronous half duplex or asynchronous full
6. Signal indication: 3 pilot lamps for Power (PWR), Send (TXD) and
7. Transmission media: twisted pair cable or shielded cable.
8. Transmission rate: 115.2Kbps to 300M, 38.4Kbps to 2.4KM and 9,600bps to 5KM.
9. Dimensions: 63mm×33mm×17mm.
10. Working circumstance: -25℃to 70℃, relative humidity 5%-95%.
Compatible with the Recommended Standards of RS232 and RS485,
UT-2017 photoelectric isolation interface converter can convert the
single-ended RS232 signal into balance differenced RS485 signal.
The built-inphotoelectric isolator can provide an isolation voltage
of as high as 2500Vrms.
Also, there is a rapid transient voltage suppression protector for
protection of RS485 interface with advanced TVS(TRANSIENT VOLTAGE
SUPPRESSOR) technology adopted. Under normal conditions, the TVS
tube is in the state of high resistance. However, when both ends of
the TVS tube are hit by a transient high energy,the impedance at
both ends can be depressed by the TVS at a very high speed,and
after absorbing a high current, the voltage between the two ends is
suppressed and kept at a pre-set value, therefore no damage is
caused to the electrical components behind by the transient high
The protector can effectively restrain lightning or ESD (electro
static discharge) with a protection voltage of 600W on each line
for lightning surge and surge voltage or transient over voltage
possibly caused up by various reasons, and at thesame time, a
high-speed transmission of RS485 interface is ensured by the tiny
capacitance between the poles. Through a DB9 female connector RS232
interface is connected to other interfaces compatible with RS232
standard, and for RS485 interfaces RJ45 and 4PIN connector is to be
used for connection.
The unique I/O circuit of the internal zero delay auto transceiver
contained in the converter controls the data stream direction
automatically without any handshaking signal (for example RTS, DTR
etc). The converter is plug-and-play without any jumper settings
needed for mode shift between full duplex half duplex (RS485).
The converter is applicable for all the existing communication
software and interface hardware without any software modifications
for the previous working mechanism based on RS232.
A reliable and stable point-to-point and point-to-multipoint
communication can be ensured by UT-2017 photoelectric isolation
interface converter. For point-to-multipoint communication, as many
as 32 interface facilities of RS-485 standard can be connected to
each converter, and a high data transmission rate of 300-115.2Kbps
can be achieved. Power indicator light and data traffic indicator
light are also available with the converter for malfunction
indication. Two conversion communication modes including RS232 to
RS485 are supported.
Connector and signal
RS-232C bay-line distribution
RS-232C Interface signal
Receive data SIN(RXD)
Send data SOUT (TXD)
Data terminal ready DTR
Ground signal GND
Data setting ready DSR
Request send RTS
Clear send CTS
Ring indication RI
RS-485 output signal and connector end bay-line distribution
RJ-45 bay-line distribution