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903-0623-00 Rev. A
5.7
907-232E Data Board (8-Channel RS-232)
Card P/N 903-5056-00
The 907-232E data board supports eight RS-232 channels. This card combines the eight I/O channels
onto the 5 data lines of the model 903 backplane. Each I/O channel supports a maximum baud rate of
115 Kbaud.
The 907-232E card is a Model 907 PC/104 form-factor card mounted on a Model 907 Eurocard adaptor
board. The adaptor board provides the necessary power supply and data interface to connect the 907
card to a 903 system.
5.7.1 Input/Output
The 907-232E cards may be installed in any data slot. Also, this card is interchangeable between remote
and console modules assuming configuration settings are identical.
The front panel view of the 907-232E card is shown in the figure below. Transmit (TXD) and receive
(RXD) lines are relative to the board.
Channels 1A, 1B, 2A, 2B are electrically isolated as a bank of 4 channels (shared isolated power, isolated
signals). Channels 3A, 3B, 4A, 4B are also electrically isolated as a bank of 4 channels (shared isolated
power, isolated signals).
Although inputs and outputs are protected from ESD (electro-static discharge), some internal circuits are
not. Hence, observe ESD precautions during handling of the boards.
The LEDs on the 907-232 board are not visible at the front panel once the card is mounted on the
907-EURO card.
Focal Technologies Corp.
Figure 5.7-1: 907-232E Front Panel
Model 903 User's Guide, FMB-X-2.5 Version
Page 5-37
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