User guide

System Hardware
4.8.6 Port Isolation on RS-422 ports
The schematic drawings show the RS-422 ports on the BSD-321.
Each port is isolated from the rest of the electronics on the BSD-321
and has separate Instrument Earth per port.
The signal reference of the driver / receiver is separated from Earth.
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System Description, AutroSafe Integrated Fire & Gas Detection System, 116-P-ASAFE-IFG/XE Rev. B, 2005-10-27,
Autronica Fire and Security AS
Page 39