San Telequip (P) Ltd.,
4 Crystal House, 235, Navi Peth
Off LBS Road, Pune 411 030, India
Phone : 91-20- 24320023, 24334423, 65001587 Connecting. Converting. Leading !
email : info@santelequip.com
.
Document Name : User Manual for 4 RS485 Hub, Model SC08 S4
SC08S is a RS485 hub specially designed to meet the requirements of RS485 under difficult field environments.
A transmission rate as high as 115.2 Kbps is supported, RS485 is 2.5KV Opto isolated, 1500W surge protected
to avoid lighting or surges, ensuring safety and reliability of the device. All the terminals are Short circuit
protected.
The transmission distance is as far as 1200 meters. This product is widely used in Express way toll system,
Energy monitoring system etc.
Specifications
Interface
: Compatible with RS232C and RS485 standards of EIA/TIA
Serial Input
: RJ45 ports for RS232 & RS485
Working mode
: Asynchronous half-duplex
Indicators
: 7 signal indicator including P, TD, RD and failure (E1-E4)
Isolation
: 2500 VRMS
Baud rate
: 300bps -115.2Kbps
Protection RS-232
: 15KV ESD
Protection RS-485
: 1500W lighting strike surge protection for each line
Protection
: Short Circuit
Port Isolation
: Each port is isolated with all other ports
Transmission distance
: 1200m
Dimension
: 90mm X 69mm X 23mm
Power Supply
: 230V AC External adapter. 5V DC, 1A output
Working environment
: Temp 0 to 50
°
C, Relative humidity 5% to 95%
Panel and Indicators
There are 7 indicator lights on the front panel of SC08S, and on the back panel there are RJ45 connectors for
RS485 or RS232 ports
Front Panel
Back Panel
PWR
Power, Green for Power ON
TXD
Data send from Input to 4 Output ports, Green for normal transmission
RXD
Data receive from 4 Output to 1 Input port, yellow for normal reception
E1-E4 Failure alarms, ON to indicate short circuit or wrong signal connection of ports 1-4
Pin Definitions
RS232 Interface
RS485 Interface
RJ 45
Connector
Definition Direction RJ 45
Connector
RS485
2
TX
OUT
1, 2
TX+/D+
3
RX
IN
3, 4
TX- / D-
5
GnD
7, 8 of Port 4
Ground
Cable Connection Diagram
RJ45 Pin
TO
DB9 Male
RS232
TX
2
2
RX
RX
3
3
TX
GND
5
5
GND
Note : Pin 7 & 8 of Port 4 is Protection Ground for Surge circuit. Ground these pins properly
