UT-1128
8-PORT RS-485 ISOLATED HUB
User Manual
2.
Voltage input: DC12-48V 350Ma
3. Transmission media: twisted pair or shielded cable
4. Working mode: asynchronous half-duplex
5. Indicators: signal, PWR, TX, RX, E1-E8
6. Isolation: non-stop isolated voltage 2500VRMS 500VDC,
DC/DC isolated module
7. Transmission rate: 300bps-115.2Kbps
8. Protection:
15KV ESD protection for RS-232 ports each line
1500W lightning and surge protection for RS-485 ports
2000V lightning and surge protection for power supply
9. Transmission distance: 0-1.2km (115,200-300bps)
10. Dimension: 145mm x 90mm x 40mm
11. Working environment: -40
-85
, 5%-95% relative humidity
1.
Ports: EIA/TIA RS-232C, RS-485 standards
1
1
2
2
3
3
UT-1128 indicators:
PWR- power indicator, it is red when working;
TX- data transmission indicator, it is blinking in green when
working, input data is transmitting to output port 1- port 8;
RX- data receive indicator, it is blinking in yellow, and output
data from port 1- port 8 is transmitting to input port;
E1-E8- fault indicators, when the lights on, the device from
corresponding port is short-circuit;
. Port definition
No.
1
2
3
4-5
6-15
16
17
18
19
20
21
22
23
24
25
26
27
28
29-32
33
34
35
36
37
38
39
40
Definition
VCC
GND
Empty
EARTH
Empty
A
B
GND1
232RXD
232TXD
A1
B1
A2
B2
A3
B3
A4
B4
GND
A5
B5
A6
B6
A7
B7
A8
B8
Remarks
Power +
Power -
Empty
Earth connection
Empty
RS485+ input
RS-485- input
Ground connection input
RS232 receiving terminal
RS232 transmitting terminal
1 RS485 output
1 RS485- output
2 RS485 output
2 RS485- output
3 RS485 output
3 RS485- output
4 RS485 output
4 RS485- output
RS485 output ground connection
5 RS485 output
5 RS485- output
6 RS485 output
6 RS485- output
7 RS485 output
7 RS485- output
8 RS485 output
8 RS485- output
UT-1128 is a RS-485 BUS hub with built-in dual core, and non-stop
working design. It is special design for RS-485 system under
complicated electromagnetic field. The transmission rate can be as
high as 115.2Kbps. To ensure the data communication safety and
reliability, it adopts optoelectronic isolation technology, and provides
with lightning and surge protection on RS-485 ports; the built-inoptoelectronic
isolator and 1500W surge protection circuit provide 2500V isolated
voltage, this prevent the devices from lightning and ESD, and ground
interference. With external power, UT-1128 is quite safe for outdoor
projects.
Under RS-485 working mode, the circuit can distinguish the data flow
direction, and switch it automatically to control the circuit; this easily
solves the transmission delay issue. The transmission distance is over
1200m. UT-1128 is a high performance converter, which is widely
used in highway toll collection system, road monitoring system, and
power collection system.
UT-1128 provides RS-485 BUS connection, each port supports
short-circuit and open circuit protection. 2500V isolated voltage
allows user improve the RS-485 BUS structure, divide the network
segment easily. When the device under lightning stroke or the device
is breakdown, these network segments will be isolated, so as to ensure
the other network segments working normally; this improves the RS-485
network reliability, makes the network maintain time shorten. UT-1128
is the best choice for reliable RS-485 system.
