Table of Contents
Advertisement
903-0623-00 Rev. A
5.8
907-485E Data Board (8-Channel RS-485/422)
Card P/N 903-5053-00
The 907-485E data board supports eight RS-485/422 channels. In the default configuration this card
combines the eight channels onto the 5 data lines of the model 903 backplane. The card has a maximum
baud rate of 250 Kbaud per each of the eight channels.
The 907-485E 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.
5.8.1 Input/Output
The 907-485E 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 907-485E
card is shown in the figure below.
Channels 1A, 1B, 2A and 2B are electrically isolated as a bank of 4 channels (shared isolated power,
isolated signals). Channels 3A, 3B, 4A and 4B are also electrically isolated as a bank of 4 channels
(shared isolated power, isolated signals).
RS422 and RS485 I/O have fail safe biasing, which ensure a defined state when the inputs are open or
shorted.
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 following figure shows the recommended wiring connections when using the 907-485E cards in 485
mode. In this case, the connection between CH1 (CH1A) and one external RS-485 device is shown. The
same connection diagram should be used for the other seven channels.
Focal Technologies Corp.
Figure 5.8-1: 907-485E Front Panel
Model 903 User's Guide, FMB-X-2.5 Version
Page 5-40
Advertisement
Table of Contents
