Shanghai ZLAN Information Technology Co., Ltd Tel: +86-17321037177 http://www.zlmcu.com
8
485A, 485B
RS485 main port
RS232
RS232 main port, can choose 1 between it and RS485 main port
OUT1A, OUT1B
RS485 slave port 1
OUT2A, OUT2B
RS485 slave port 2
OUT3A, OUT3B
RS485 slave port 3
OUT4A, OUT4B
RS485 slave port 4
GND, +9
～
24V
Power supply terminal input
5. Usage
1)
Extension usage:
when master RS485 device need connect 4 RS485 slave
stations through star-type, connect master station with 9440 master port, slave
station connect 9440 slave port, it can prevent interference between RS485 as
effectively isolation.
2)
Isolation:
connect one end of RS485 wire to the RS485 master port, the other
end connect to any of the RS485 slave ports, so the RS485 wire is isolated
effectively, can be lightning protection and anti-interference. Effectively protect
the RS485 device in other end from damage by big voltage and strong current.
3)
Relay:
when RS485 wire exceeds 1200m, the signal will attenuate and the
interference will increase. ZLAN9440 is adopted to extend the communication
distance.
4)
Conversion:
can realize RS232 converting to RS485, and it’s active converter
with strong compatible. Also has isolation character, prevent the monitoring
computer to be damaged by RS485 strong voltage.
6. After-service
