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Documentation Number 3PCIOSD1x-3903m Manual Appendix E E-1
B&B Electronics Mfg Co – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104
B&B Electronics Ltd – Westlink Comm. Pk. – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445
Appendix E: ISOLATION AND GROUND
The 3PCIOSD1x provides 2000 VDC minimum isolation on all
lines from the DB25 connector to the host computer. The
3PCIOSD1x cards have no connection from pin 1 (chassis ground)
to ground of the host computer. This was done to completely isolate
the computer end of the communications. In most applications, the
shield wire should be connected to ground on only one end of the
network. Board space is provided to connect pin 1 to the isolated
port ground (pin 7). If you wish to make this connection, it is
recommended that a 100Ω ½ watt resistor be installed in R5 of the
3PCIOSD1x. The purpose of the resistor is to limit large currents
flowing through the ground connection.
E-2 Appendix E Documentation Number 3PCIOSD1x-3903m Manual
B&B Electronics Mfg Co – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104
B&B Electronics Ltd – Westlink Comm. Pk. – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445