Avlink MRM-602P - Manual (Page 23)

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6.5.2 RS-485
RS-485 is a standard defining the electrical characteristics of drivers and receivers for
use in balanced digital multipoint systems. Digital communications networks
implementing the RS-485 standard can be used effectively over long distances and in
electrically noisy environments. The Switcher support up to two RS-485 ports allows you
to control more than one relative Device. If the master device is specified for IPM, it
allows you to control all the series devices with web browser. Remember all the ID of
each device upon series connection has to be uniquely.
Figure 6-10 RS-485 Connection
See Pin definitions as below:
RS-485
+ - + -
Figure 6-11 RS-485 Port
Serial connection between Matrix RS-485:
Pin1 TX（+） TX（+）--- Transmitted Data +
Pin2 TX（-） TX（-）--- Transmitted Data -
Pin3 GND (Ground)
Pin4 RX（+） RX（+）--- Received Data +
Pin5 RX（-） RX（-）--- Received Data -
 RS-232 and RS-485 baud rates: 9600bps, no odd or even calibration address, 8bit
data transmission address, 1bit stop address (9600, N, 8, 1).