IMPACT SUBSEA
INNOVATIVE UNDERWATER PRODUCTS
www.impactsubsea.com
Document No:
0000.1913 |
Version No:
1.2 | 23
rd
April 2020
10
4.2.2 Power
The ISA500 is polarity protected and fused with a 400mA resettable poly fuse. Internal
circuitry isolates the supply from the outside environment requiring the serial interface.
4.2.3 Serial Interface
The ISA500 serial communications protocol can be set to either RS232 or RS485. For use
with the ISFMD Topside Interface box, the unit must be configured to RS485
communications.
The RS232 and RS485 interface is isolated from the supply and has in-line fused protection
on the serial lines. A prolonged transient voltage on these lines will blow the surface
mount fuses which will require replacement by Impact Subsea or an approved distributor.
4.2.4 RS232 Wiring
Note: RS232 will not function if the digital 0V pin is not use as the RS232
ground.
