IMPACT SUBSEA
INNOVATIVE UNDERWATER PRODUCTS
www.impactsubsea.com
Document No:
0000.1913 |
Version No:
1.2 | 23
rd
April 2020
11
4.2.5 RS485 Wiring
The RS485 termination resistor is software selectable.
The digital 0V must be connected on an RS485 interfaces, otherwise the
voltage potential between one of the A+ or B- lines to ground could
reach a damaging level
4.2.6 Establishing Communications
The default serial settings for FMD are
RS485, 9600, N81
If the communications require to be changed to RS232 or an alteration in baud rate is
required, this can be conducted using the below method:
If the ISA500 is tilted from vertical to upside down 3 times within the first 10 seconds of
power up then it will temporarily configure the serial interface to
RS232, 9600, N81
and
output an ASCII message displaying the settings.
Note:
When the device is power cycled the serial interface setting will revert back to the
last configuration.
