RS-232/RS-485/RS-422 UT-217E
NO Power Photoelectric Isolation
Interface Converter
User Manual
The converter is applicable for all the existing communication
software and interface hardware without any software modifications
for the previous working mechanism based on RS-232.
A reliable and stable point-to-point and point-to-multipoint
communication can be ensured by UT-217E photoelectric isolation
interface converter. For point-to-multipoint communication, as
many as 32 interface facilities of RS-422 or 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 RS-232 to RS-422 and
RS-232 to RS-485 are supported.
II. Performance parameters
1. Interface characteristic: compatible with the standards of
RS-232C and RS485/RS-422 issued by EIA/TIA.
2. Electric interface: DB9 female connector for RS-232 interface
input end, RJ-45 and 4PIN connector for RS-422/RS-485 interface
output end.
3. Protection grade: +/-15KV ESD protection for RS-232 interface,
and 600W surge protection each line for RS-422 and RS-485
interfaces.
4. Isolation degree: isolation voltage 2500Vrms 500DC non-stop.
5. Operation mode: asynchronous half duplex or asynchronous
full duplex.
6. Signal indication: 3 pilot lamps for Power (PWR), Send (TXD)
and Receive (RXD).
7. Transmission media: twisted pair cable or shielded cable.
8. Transmission rate: 115.2K BPS to 300M, 38.4K BPS to 2.4KM
and 9,600 BPS to 5KM.
9. Dimensions: 93mm 74mm
22mm.
10. Working circumstance: -40 to 85
, relative humidity 5%-95%.
11. Transmission distance: 0-1,200meters (115,200bps-9,600bps).
III. Connector and signal
RS-232C bay-line distribution
Earth protection
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
1
2
3
4
5
6
7
8
9
DB 9 Female
(PIN)
RS-232C Interface signal
IV. Hardware installment and application
Read the user manual carefully before installing the
U T - 2 1 7 E p h o t o e l e c t r i c i s o l a t i o n i n t e r f a c e c o n v e r t e r.
Connect the attached communication cable to RS-232
interface, and insert the power supply converter to power
socket. The product adopts the DB-9/RJ-45 general used
connector for input and output interface without jumper
setting for RS-485 or RS-422 automatic communication
mode. Either twisted pair cable or shielded cable is
a p p l i c a b l e f o r e a s y i n s t a l l a t i o n o r u n - i n s t a l l a t i o n .
T/R+T/R-represents sending and receiving the A+/B-,
R X D + / R X D - r e p r e s e n t s r e c e i v i n g t h e A + / B - , V C C
represents power input or output, GND represents public
underground line. Point-to-point and point-to-multipoint
RS-485/RS-422 output signal and connector end
bay-line distribution
88
11
RJ-45 bay-line distribution
4PIN
(PIN)
Output signal
RS-422
full-duplex
connection
RS-485
half-duplex
connection
T/R+
T/R-
RXD+
RXD-
GND
Send(A+)
Send(B-)
Receive(A+)
Receive(B-)
Underground line
RS-485 (A+)
RS-485 (B-)
None
None
Underground line
RJ-45
1
2
3
6
4.5.7.8
1
2
3
4
1
2
3
Compatible with the Recommended Standards of RS-232C,
RS-422 and RS-485
UT-217E photoelectric isolation interface
converter can convert the single-ended RS-232 signal into
balance differe nced RS-422 or RS-485 signal. The built-in
photoelectric isolator can provide an isolation voltage of as high
as 2500Vrms. Also, there is a rapid transient voltage suppression
protector for protec tion of RS-422/RS-485 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 volt age 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 voltage impact.
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 the same time, a
high-speed tra nsmission of RS-422/RS-485 interface is ensured
by the tiny capacitance between the poles. Through a DB9 female
connector RS-232 interface is connected to other interfaces
compatible wit h RS-232C standard, and for RS-422 and RS-485
interfaces RJ- 45 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 (RS-422)
and half duplex (RS-485).
I. Summary