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Tibbit#44-2- Isolated RS232 or 422 or 485 Port (Terminal Block)

Tibbit#44-1: Isolated RS232/422/485 Port (DB9M Connector) and

Tibbit#44-2: Isolated RS232/422/485 Port (Terminal Block)

Tibbits^® (as in "Tibbo Bits") are blocks of prepackaged I/O functionality housed in brightly colored rectangular shells. Tibbit#44-2: This is a "full" serial port that can be electronically configured to work in RS232, RS422, or RS485 mode. The Tibbit is based on the Sipex SP337 universal transceiver.

Galvanic isolation is achieved by using ISO7141 and ISOW7842 digital isolators manufactured by Texas Instruments (ISOW7842 also generates isolated power). These isolators create a separate power domain containing the SP337 transceiver, surrounding circuitry (not shown on the diagram), and the connector (The DB9M Connector is for Tibboit#44-1;The terminal block connector is for Tibbit#44-2).

Due to the isolation, the ground pin (pin 5) of the terminal block is not connected to the system (CPU) ground and exposes the ground of the isolated domain instead. All I/O lines on the terminal block connector are also from this isolated domain. The need to route an isolated ground to the outside world is why this Tibbit is implemented as a hybrid (H2) and not just a module (M2), as is the case with the non-isolated RS232/422/485 Tibbit #02.

The theoretical isolation between the system power domain and the isolated power domain of this Tibbit is large enough to withstand typical ESD events. The isolation also protects against small ground potential differences that may eventually cause equipment failures.

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