Measurement Computing DBK202 Series - Manual (Page 6)

pg. 6, DBK202, DBK203, and DBK204 Series 938994 DBK Option Cards and Modules
Using Screw-Terminal Blocks
CAUTION
Turn off power to the host PC and externally connected equipment prior to connecting cables or
signal lines to the DBK. Electric shock or damage to equipment can result even under low-voltage
conditions.
Take ESD precautions (packaging, proper handling, grounded wrist strap, etc.)
Use care to avoid touching board surfaces and onboard components. Only handle boards by their
edges (or ORBs, if applicable). Ensure boards do not come into contact with foreign elements
such as oils, water, and industrial particulate.
Do not confuse connectors. Ensure that you only connect P1 I/Os to P1, P2 I/Os to P2, and P3
I/Os to P3. Improper connection may result in equipment damage.
Be sure to align the P4 orientation indicators (Œ) prior to mating the P4 connectors.
1. Review the preceding CAUTIONS and the P4 alignment note.
2. Access the terminal blocks:
a) DBK202 – access of the board is direct, or as determined by your own custom
enclosure.
b) DBK203 – Loosen the two thumbscrews on the front panel and slide the card
drawer free of the unit.
c) DBK203A – Remove the upper inside screw from each of the four corner brackets
(see figure, page 2) and lift the cover plate from the unit.
d) DBK204 and DBK204c – Follow step 2b or 2c as applicable to your unit.
3. Make the wiring connections to the terminals. Refer to the board’s silkscreen and to the pin
correlations on the next few pages.
4. Tighten the terminal block screws snug. Do not over-tighten.
In general, the following terminal block-to-signal relationships apply:
o TB9, TB10, TB11, and TB12 are used for ANALOG IN and provide a connection
option to the P1 (DB37) connector.
o TB5, TB6, TB7, and TB8 are used for DIGITAL I/O and provide a connection
option to the P2 (DB37) connector.
o TB1, TB2, TB3, and TB4 are used for Pulse/Frequency/Digital I/O and provide a
connection to the 40-pin header (P3).