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UT-2204 4-port RS-485 Smart Data Converter
Instruction Manual
Overview
UT-2204 is a RS-485 bus split hub designed for RS-485 system
used in dema nding envir onments. It supports a data communication
rate up to 115.2KBPS and has data buffers and microprocessors. It
uses external switching power supply for safety and reliability and is
ideal for engineering applications.
The built-in discrimination circuit can automatically sense the
direction of data flow and switch the enable control circuit to ensure
the switch of transmit and receive in RS-485 mod e. The comm unication
distance of RS-485 can exceed 1200m for stable performance, so it's
widely used in applications such as video supervision system as a
high-performance data interface converter.
UT-2204 RS-485 HUB provides star-type RS-485 bus connection.
Users can im prove the RS -485 bus structure and split bus segments
conveniently to improve the communication reliability. This feature
significantly improves the reliability of existing RS-485 network and
reduces maintenance interval. Reasonable use of UT-2204 RS-485HUB
can help to design a unique, highly reliable RS-485 system.
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Features
Interface: Compatible with RS-232 and RS-485 standards of EIA/TIA
Electric connection: DB9/F socket for RS-232C interface, wiring
terminal for RS-485 end
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10. 210mm
140mm
32mm
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Transmission media: twisted-pair cable or shielded cable
Operation mode: Asynchronous half-duplex
Signal indicator: 9 signal LEDs: power (PWR), transmit(TXD1),
(TXD2), receive (RXD1),(RXD2) and error (E1-E4)
Data rate: 1200BPS-115.2KBPS
Protection class:
15KVESD protection;1500W lightning surge
protection for RS-485 interface
Transfer distance: 0-1.2 Kilometers (115200-1200BPS)
Power supply: DC9-30V 1A
Dimension
Working environment: -40
to 85
,relative humidity of
5% to 95%
Panel and signal indication
There are 9 indicator lights on the front panel of UT-2204.
Wiring terminal and socket are on the rear panel. RS-232 Setup
port is used for baud rate setting (please refer to the software
instruction manual), SIGNAL OUT is alarm relay output, DC9-30
is the power input socket and wiring terminal, RS-485INPUT and
RS-485OUTPUT are data communication ports.
Figure 2 Rear panel view of UT-2204
Figure 1 Front panel view of UT-2204
Explanations of indicator lights on the front panel of UT-2204
power indicator, normally red
data transmitting indicator, normally flashing green,
indicating that the data is transmitted from RS-485 Output
1-4 to RS-485 Input 1-2ports
data receiving indicator, normally flashing yellow, indicating
that the data is transmitted from RS-485 Input1-2 to RS-485 Output
1-4 ports
error alarm indicator for port1-port4; If it always turns
ON then the RS-485 interface devices connected to port1-port4
are short-circuited or reverse connected, and E1 corresponds to
port 1, and E4 corresponds to port 4, and at the same time alarm
relay will operate and the normally open contacts will be closed.
Users can determine the failed port and the connected faulty device
according to the state of these error alarm indicators.
PWR
TX
RX
E1-E4
Electric interface and its definition
Figure 3 RS-232 interface
RS-232C
interface definition
RS-485
interface definition
2
RS-485
interface definition
Wiring terminals
D x +
D x -
GND
Note: X can be 1, 2, 3 or 4
Description
485+
485-
GND
E2
RX1
TX1
PWR
4-port RS-485 Smart Data Converter
E1
E4
E3
Model:UT-2204
RX2
TX2
Protective earth SIN (RXD)
Transmit data SOUT(TXD)
Receive data SIN(RXD)
Empty
Signal ground GND
Empty
Empty
Empty
Transmit data
DB9 Female
(PIN)
1
2
3
4
5
6
7
8
9
RS-232C Interface signals
1
RS-232C interface definition
5
1
9
6
RS-485+ RS-485-
GND
D
2
D
1
D
1
+
G
N
D
G
N
D
D
2
+
D
4
D
3
D
3
+
G
N
D
G
N
D
D
4
+
D
2
SIGNAL OUT
NO NC COM
DC9-30V
+
RS-232 Setup
D
1
D
1
+
G
N
D
G
N
D
D
2
+
RS-485 OUTPUT
RS-485 INPUT
5
1
9
6
Figure 4 RS-485 interface
