ProSoft Technology PLX31-EIP-SIE - Manual (Page 47)

PLX3x Series Hardware Information
Ethernet and Serial Gateways User Manual
ProSoft Technology, Inc. Page 47 of 218
September 17, 2014
4.1.1 Serial Port Specifications
Type Specifications
Serial Port Isolation 2500 Vrms port signal isolation per UL 1577
serial port communication signal uses RF(Radio
Frequency) modulation signal as isolation media, IC
chip model is Silicon Labs Si844x
(Si8440,Si8441,Si8442).
Serial Port Protection RS-485/422 port interface lines TVS diode protected
at +/- 27V standoff voltage.
RS-232 port interface lines fault protected to +/- 36V
power on, +/- 40V power off.