User manual

32 User Manual
4 Instrument Connection
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Digital I/O Connection
Each channel has a 25 pin female connector with 16 signal lines. Of the 16,
eight are bidirectional input/output signals (for such functions as valve
control) and the remaining eight lines are input-only signals (for such
functions as reading bottle-number inputs). A "Y" adapter cable (Figure 10) is
available to route the 16 digital I/O signals to two 9-pin connectors. This cable
takes the wires from the 8 digital I/O signals in the 25 pin connector and
routes them to the 9 pin female connector labeled "A", and the 8 digital input
only signals and routes them to the 9 pin female connector labeled "B". Use an
instrument-specific cable whenever possible. Use a general purpose cable for
equipment not listed in Table 9 or Table 10. Appendix A lists pin assignments
for all open cables.
1 Turn off the power to both the 35900 and the instrument containing the
digital I/O connections.
2 Attach the "Y" adapter cable's 25 pin connector labeled "C" to the
appropriate channel's digital I/O connector on the rear of the 35900.
3 For instrument-specific cables—Connect one end of the cable to the
instrument's digital I/O connector using the instrument manufacturer's
instructions.
For general purpose cables—Use the pin assignments shown in
Appendix A for connector "A" or "B", and follow the instrument
manufacturer's instructions to connect to the instrument's digital I/O.
4 Connect each instrument's digital I/O cables to the "Y" adapter cable's "A"
and "B" 9 pin female connectors. Note that the "Y" cables "B" connector is for
bottle number type digital input and its "A" connector is for digital I/O used
to control relays.
5 If needed, repeat for the other channel.