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5-3 Optional Analog Output (Terminal 10)
5-3.1 Electrical Characteristics of Analog Output
Controlled by an Open Collector transistor, it
gives a linear 4 to 20 (or 0 to 20) mA sink which
corresponds to displayed rate or total readings. A
sinking driver pulls a current to ground, across
the user's external device (such as a strip chart
recorder, computer, external meter, etc). In the
Setup mode the user is prompted to set the
output to correspond to rate or total and set the
low and high (4/0 to 20mA) parameters to which
the analog signal will correspond.
Idea:
The Unit can supply the 24VDC to power
the current loop. (Connect pin 15 to 13,
Pin 16 is now +24 VDC with respect to pin
12.) Connect Pin 16 to the + DC side of
the external device and connect Pin10 to -
DC side of the external device (see Figure
5-3.1).
5-4 Optional RS232 / RS422 Serial
Communications
This option allows The Unit to act as a slave to a
master terminal. It may be accessed for counts,
rate, presets and K Factors. Up to 15 units can be
linked together in parallel and addressed
separately to transmit unit status or accept new set
points using the standard ASCII format. Baud
rates of 300, 600, 1200, 2400, 4800 or 9600 as well as
choice of odd, even, space, or mark parity can be
selected by keypad control. Further information
and more details are provided in Section 8 at the end
of this manual.
Figure 5-3.1
SECTION 6 TROUBLE SHOOTING AND
MAINTENANCE GUIDE
6-1 Warning Messages
6-1.1 RFFFFFFF
Indicates that:
a) The factored input "A" rate has exceeded a
7 digit number.
b) The factored input net rate has exceeded a
7 digit number.
The ratemeter cannot handle numbers larger
than 7 digits (i.e. 9999999). Change the Rate K
Factors to larger numbers to correct this problem.
See Section 3-3, Menu Item 1.
6-1.2 LOCK ON
Indicates that the unit has been locked out! The
unit must be unlocked before any changes can be
made. See Section 3-3, Menu Item 2 to unlock
the unit.
6-2 Troubleshooting
6-2.1 General
The following troubleshooting procedures have
been developed as an aid in locating defects. Not
every possible problem has been listed, but a
general isolation procedure for tracking down
problems has been given. A standard
recommendation is the removal of power for 2
seconds. This allows the microprocessor to go
through a reinitialization cycle at power up. If it
is determined that the unit is faulty, contact your
local Factory Representative or Sales Office
concerning replacement. The Unit is not field
serviceable and all repairs should be performed
by the factory.
Summary of Contents for KEPtrol F/C
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