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903-0623-00 Rev. A
5.2
DIB-232-16 - High Density RS-232 Card
Card P/N 903-5020-00
The High Density RS-232 card (DIB-232-16) supports sixteen bidirectional channels of RS-232 data.
Channels 1-8 are located on the motherboard; channels 9-16 are located on a daughtercard. The front
panel connector is a high density, 62-pin D-subminiature type, as shown below in Figure 5.2-1. Pin
connections are given in Appendix A.
Each channel includes pins for receive, transmit, and isolated ground, where receive data is defined as
coming into the front panel of the Model 903 from an external device. Each channel is fully opto-isolated
from the other channels and the internal digital ground of the Model 903.
Maximum RS-232 NRZ data rate is 115 kbps. Switch S1:1 should be set "off" (open) for correct operation
with FMB-X-2.5 systems, which support high speed sampling on all data ports. Figure 5.2-2 shows the
DIB-232-16 motherboard PCBA, including the location of switch S1. If the daughtercard is replaced for
some reason, ensure that the alignment dot on the daughtercard matches the location of the alignment
dot on the motherboard.
Options for breakout boxes and harnesses are available from the factory. For testing, mating pigtail
harness is P/N 903-9002-02.
Focal Technologies Corp.
PIN 42
PIN 62
PIN 43
PIN 22
Figure 5.2-1: DIB-232-16 High Density RS-232 Board
Model 903 User's Guide, FMB-X-2.5 Version
PIN 21
RS-232
PIN 1
Page 5-4
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