Rice Lake 550-10 Installation Guide download pdf (Page 22)

of where the resonator was before you removed it back on page 8. Over on the

DPU board, you can find ground at the “out” connector's left pin. This is the

pin closest to the corner of the DPU board. You should see a dead short

between these two points. If your meter initially shows it shorted but then an

open, this implies that you are seeing filter capacitors which would mean one

of the cable ends is on backwards. Fix this before moving on.

22. [ ] Again using your meter, verify that you do not have a dead short

between power and ground. You can access these nodes at the power

connector bolted to the DRO enclosure.

23. [ ] The full version of the DPU-550 enables you to have two more scales,

two more electronic edge finder inputs, another tachometer input, and an

RS232 port

. Connect these as you see fit.

24. [ ] If you choose to install a piezo beeper, connect it to one of the Flex

connectors. They may be labeled Tach or AUX. I used the one on the DRO

circuit board.

The red wires goes to the +5 volt pin and the black wire goes to the center pin

which is normally the input. The software will pull this center pin down to ground

to make the beeper sound. You may need to put a large resistor across the piezo

beeper to quiet it when not turned on. There is a small leakage current at all times.

I used a 10K resistor. Just be sure that the total current flow is less than 8 mA. See

8 The RS-232 connection on the DPU-550 is primarily intended for software development

since it's where all of the pretty debug messages go but it's perfectly usable for programming

and PC automation. It is not include on the Lite board because most people will probably

prefer the USB. The RS-232 only uses three connections - transmit, receive, and ground. The

DB-9 connector is wired to the DPU-550 by connecting pins 2 & 3 to the Tx and Rx ports,

respectively, on the RS-232 header. Pin 7 on the DB-9 is wired to ground.

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Rice Lake 550-10 Installation Guide Page 22