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Transition Module Preparation and Installation
The EIA-232-D SIMs employ MC145406 ICs as line transmitters to convert the TTL output
signals from the CPCI-6020 module to EIA-232-D voltage levels. As line receivers, the
MC145406 ICs convert the EIA-232-D input signals to TTL voltage levels which are sent to the
CPCI-6020. For all port interfaces, the SIMs support the transmitter signal element timing as
either input or output signals.
The MC145406 transceiver IC requires a series diode on the +12 V supply and a clamp diode
to logic ground on the -12 V supply. The diodes are located on the transition module rather than
on the SIM due to space limitation.
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CPCI-6020 CompactPCI Single Board Computer Installation and Use (6806800A51C)
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Serial Interface Module Circuitry
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