Advantech TPC-651T-E Series User Manual
Also see for TPC-651H-E Series: User manual
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17 TPC-651T/TPC-651H User ManualChapter 2 System Setup2.5 Power/Digital Ground and Earth GroundThe purpose is to block all the external interference on the chassis, and prevent anypossibility of bad grounding design to cause electric shock of people. This is so calledlevel 1 isolation which consumer PC do not implement this kind of design. TPC Chassis and Earth (Power pin3) are short, TPC Chassis and Power / Digital GND are OPENThe TPC is and industrial grade product, designed to prevent external interferenceand the possibility of electric shock. To complete the isolation design, we need toconsider the following: The Ethernet is isolated, a LAN connection will not impact the isolation design. For general USB devices, to solve EMI and ESD issues, they are designed as achassis and digital short. But the TPC prevents damage to USB devices, ESDand EMI solutions are designed to use the Power GND as a vent path to ensurePower GND and Chassis GND will not have potential difference abnormalities. For COM ports, since there are different COM port designs, long distance con-nection cause voltage level difference between the two COM port chassis.Sothe shell ground of cable must be isolated to signal digital groundIn real cases, many customers may break the level 1 isolation by 3rd party Device orcable design, in this situation, we need to consider making all the GND short (PowerGND/Digital GND/Earth GND), and ensure customers have good Earth GND connec-tion. |
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