Jamar RAC Plus I, User Manual

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4-7
Chapter 4 — Key Functions & Operating Procedures
Note:
To view the Clock/Timer while in the normal measuring mode (not
as a Menu function), press the #1 key. D-1 will then display the clock/timer
in hh.mm.ss format. Press the #1 key again to toggle back to distance. This
function does not interrupt the distance count.
IMPORTANT: Once the RAC is turned off, the clock/timer shuts off and
will reset to zero on the next power up. Also note that the Count Hold
does
not
stop the clock/timer.
Menu 5 - Distance Pulse Output (DPO)
Note: Use of the Distance Pulse Output feature with a Modular Distance
Sensor (MDS) requires a factory modification to the MDS. Contact us using
the information on page iii if you need to use this feature with an MDS.
When activated, the distance pulse output (DPO) will provide a +5 VDC
(TTL level) output pulse at a pre-selected distance interval and signal dura-
tion. This low level signal is provided on the red wire in the power/signal
cable. The +5 VDC signal can be used to send distance pulsed to a computer
or other device that can accommodate low voltage, low current signals.
Should you wish to control a +12 VDC high current device, you will need
our optional DPO Amplifier.
In addition to creating a DPO pulse at the pulse interval, one byte of data is
sent out on the RS-232 communications port. This byte contains an ASCII
'S' at 9600 baud. This capability allows the RAC to effectively signal a PC
or other type of unit at the leading edge of the DPO pulse.
CAUTION: The DPO signal can be used to control potentially hazard-
ous equipment. When activated, the DPO could cycle this equipment at
any time. If you are working with this type of equipment, TURN OFF
the RAC, which will deactivate the DPO signal.
To activate the DPO signal:
Step 1
Press the
Menu
key, the
#5
key, then
the
Enter
key. At this point, the RAC
is ready to have an interval distance
entered.
Fig. 4.8 — Enter DPO Distance