KEPCO PROTROL Manual

PROTROL
INSTALLATION & OPERATING INSTRUCTIONS
99320 9/24/97
KESSLER-ELLIS PRODUCTS
10 Industrial Way East
Eatontown, NJ 07724
800-631-2165 • 732-649-7100
Fax: [phone]
http://www.kep.com

DESCRIPTION .......................................................................1
TYPICAL APPLICATION........................................................1
MOUNTING ............................................................................2
JUMPER OPTIONS................................................................2
WIRING ..................................................................................3
WIRING CONNECTIONS....................................................... 3
DEFINITIONS.........................................................................4
FRONT PANEL OPERATIONS..............................................6
PROGRAMMING FLOW CHART...........................................6
PROGRAMMING....................................................................7
SETTING THE PRESETS & PANEL LOCK ........................... 9
CALCULATING THE K FACTORS......................................... 10
INTERFACE CARD RS 232/422 OPERATION......................11
RS 232 / RS422 WIRING .......................................................14
TROUBLESHOOTING GUIDE ............................................... 15
WARRANTY
TABLE OF CONTENTS

1
DESCRIPTION
Description:
Featuring 6 digits of bright, 7-segment
LED displays, the Protrol is a rate, ratio
and draw meter which is field program-
mable. The two inputs (A & B) have
separate scaling factors. The unit can
be programmed to display: two sepa-
rate ratemeters (A & B), the net differ-
ence of A & B, and the ratio of A to B (A
÷B) or the draw [(A - B) ÷B]. Two
assignable set points are standard with
a programmable hysteresis (alarm
range).
Specifications:
Display:
6 digit, .55" high, 7 segment, red or-
ange, LED.
Rate Display: The ratemeters (A&B)
update once per second and are ac-
curate to 4.5 digits. The unit will
sample from 2 to 24 seconds and will
compute a weighted average (normali-
zation).
Input Power:
110 ±15% or 12 to 15VDC
220 VAC ±15% or 12 to 15VDC
24 VAC ±15% or 12 to 15VDC.
Current::
maximum 250 mA DC or 6.5 VA at
rated AC voltage.
Output Power:(AC powered units) +
12VDC @ 50mA
unregulated -10 +50%
Temperature:
Operating:
+32°F (0°C) to +130°F (+54°C).
Storage:
-40°F (-40°C) to +200°F (93°C).
Memory:
EEPROM stores data for ten years if
power is lost.
Reset:
Front Panel:
Resets (updates) normalization pro-
cess.
Remote: Resets control output (if it's in
hysteresis and below the preset).
Control Outputs:
2 each N.O. Relay - 10Amp @ 120/
240 VAC or 28 VDC. (N.C. Relay
contacts or NPN sink from 10VDC to
.5V @ 100mA available with solder
jumpers).
Input:
High Impedance (STD):
Open or 0 to 1V (low), 3 to 30V (high)
10K Ohm impedance. 10KHz max.
input speed.
Mag Pickup (Option M):
30mV input (50 V max. P/P) signals
10 KΩimp. 5 kHz max.
NOTE:
The Mag. input has filtering as fol-
lows: 30mV trigger level up to 300Hz
0.25 V trigger level at 5KHz
Set Points: Two, 5-digit control set
points are provided. The outputs have
a programmable hysteresis alarm
range from 0 to 9999
Programming: Set points, decimal
points, Scaling from .0001 to 99999,
input type, normalization factor, hys-
teresis alarm range, and security
panel lock code are all programmable
from the front panel.
Housing: Standard 1/8 DIN, high im-
pact ABS plastic case (NEMA 4 front
panel).
Shipping Weight: 2 lbs.
TYPICAL APPLICATION
This application involves the monitoring and control of a paint mixture. The paint mixture must be a ratio of .2 gallons of
pigment to every gallon of base. The flowmeter in the pigment line has a K factor of 50 PPG (pulses per gallon). The K
factor for the flowmeter in the base line is 70 PPG. The individual rates must be displayed in GPM (gallons per minute).
To yeild a reading in GPM, the K factors have to be divided by 60. K factor A (pigment) = .8333 (50 ÷60); K factor B
(base) = 1.1667 (70 ÷60). By programming a decimal in the third location, Presets A & B can be set at .201 (upper limit)
and .199 (lower limit) respectively. With both outputs assigned to display C (net value of A ÷B), output A will decrease
the amount of pigment being added and output B will increase the amount of pigment being added. This will keep the
ratio within desired limits.
1. COMMON
2. N.O. (N.C. / NPN)
3. COMMON
4. N.O. (N.C. / NPN
5. A INPUT
6. B INPUT
7. 12 V OUTPUT / +DC INPUT
8. -DC (GROUND)
9. RESET INPUT
10. NOT USED
11. AC INPUT
12. AC INPUT
A
B
INCREASE
DECREASE
BASE BLENDER
PUMP
PUMP
METER
PIGMENT
METER

2
MOUNTING
HOW TO MOUNT:
Slide the body of the unit through the rubber gasket. Insert the unit into the panel. Slide the
brackets up the groove to press against the back of the panel, as shown in "FIG. A". Insert
the screws into the rear of the brackets.
Tighten the screws evenly and alternately. A panel less than .1" may distort if the clamps are
screwedtootightly. Donotovertighten! Anormalleveloftorqueisrequired. Maximumtorque
should be 3" pounds.
FIG. A
3.622
(92)
3.925
(99.7) 4.437
(112.7)
2.62
5
(66.6
8
4.245
(107.8)
JUMPER OPTIONS
Output Jumper Selections
Before making any board modifications, be sure power is
disconnected and locate the plastic extender to the case at
the rear of the unit. To remove the extender locate and
remove the two screws which hold it in place. After the
extender is removed the PC board will be exposed.
The unit must be removed from the case to access jumpers
C & F, all other jumbers can be accessed by removing the
plastic extender.
J4
J5
J6
J3
J1
J2
CR1
R3
C8R7R5
R4
U1
CR2
REV
20229
CR6
CR3
U3
P1
R10 R6 C6
C7
CR4
CR5
C4
R2
R1
C3
C5
U2 U4
U6
U5
R8
R9
C1
C2
C9
B
C=CLOSE, O=OPEN
4-30V INPUT Millivolt INPUT
Input A J1-O, J2-C, J3-O J1-C, J2-O, J3-C
InputB J4-O, J5-C, J6-O J4-C, J5-O, J6-C
Mag. Input Jumper Selections
If the unit has the millivolt input bd.# 20229, A & B inputs
can be separately solder jumper programmed to accept
either a low millivolt or 4-30 V input. Each unit shipped is
programmed according to part number. If solder jumpers
are made, the part number should be modified to reflect the
changes made
FUNCTION
"A" RELAY
N.C. OUTPUT
"B" RELAY
N.C. OUTPUT
"A" PRESET
TRANSISTOR (NPN)
"B" PRESET
TRANSISTOR (NPN)
MODIFICATION
CUT JUMPER
AT "A" "B" TO "2"
CUT JUMPER
AT "D" "E" TO "4"
CUT JUMPER
AT "A" "C" TO "2"
CUT JUMPER
AT "D" "F" TO "4"
BOTTOM VIEW AT TERMINAL
DE
G
H
20192
12 11 10 9 8 7 6 5 4 3 2 1
L
4AB2
FC

3
WIRING
AC / DC CONNECTIONS:
NOTE: Connect power only after other connections are finished. Do not touch the live AC power terminals.
The unit has been designed with an isolated AC input, therefore polarity is not a concern for the AC power.
The chasis is plastic, therefore earth ground is not used. For DC operation, connect +DC to terminal 7 and -
DC to terminal 8.
Although the unit is designed to be immune from line or RF interference, the unit is controlled by a micropro-
cessor and an electrically "noisy" environment could cause operating problems. The input power lines should
not be common to power lines for motors, pumps, contactors, etc.
Four sources of noise can occur:
1) AC power line noise- If the unit cannot be connected to an electrically clean power source, an inductive
load supressing device (MOV as GE#V130LA1 or Resistor Capacitor as Paktron# .2uf/220 ohm @ 400V) can
be installed. Although locating the suppressor across the AC supply at the unit should help, best results are
obtained by connecting the suppressor across the leads of the "load" at the device causing the spikes.
2) Input line noise- The noise is carried on the input and DC ground lines. Make sure the input wires are not
run into the unit in a bundle with power input lines. We recommend using shielded cable. Connect the shield
to DC ground of the unit and "earth" at one point in the circuit preferably at the DC ground terminal of the unit.
3) Output lines- The unit has Two relay outputs. When these outputs are used to run external relays or
solenoids, spikes can be generated upon activation. This noise can spread through the instrument causing
operating problems. If the source is a D.C. operated device, a general purpose diode (IN4004) placed across
the solenoid prevents electrical noise spikes. Connect the cathode (banded side) to the more positive side of
the coil. If the source is an A.C. operated device, use a Resistor Capacitor or MOV across the coil.
4) 12 VDC output supply- Noise can be generated on the 12 VDC output supply if it is used to drive inductive
loads or if the current draw exceeds 50 mA. Insure that all inductive loads have a diode (such as IN4004)
across the coil and that the current does not exceed 50 mA.
WIRING CONNECTIONS
1. COMMON
2. N.O. (N.C. / NPN)
3. COMMON
4. N.O. (N.C. / NPN)
5. A INPUT
6. B INPUT
7. 12 V OUTPUT / +DC INPUT
8. -DC (GROUND)
9. RESET INPUT
10.NOT USED
11. AC INPUT
12. AC INPUT
A
B

4
DEFINITIONS
FACTOR - SCALING FACTOR; This portion of the programming menu sets up the input
scaling factors. Each input has a seperate dividing scale factor.
DP F A - DECIMAL POINT FOR FACTOR A; This sets a decimal for factor A if desired.
DP F B - DECIMAL POINT FOR FACTOR B; This sets a decimal for factor B if desired.
RATE - RATE; This portion of the programming menu sets up the ratemeter information.
DP LOC - DECIMAL POINT LOCATION; This sets a decimal location for the rate displays
(A, B and C). This is a fixed decimal and will effect the rate displays as well as presets A &
B.
A-B - A - B; This sets the C display to show the difference of the A & B inputs.
A-B /B - (A-B)÷B; This sets the C display to show the draw (ratio of A - B) of the A & B
inputs.
A/B - A ÷B; This sets the C display to show the ratio of the A & B inputs.
HI CPS - HIGH COUNTS PER SECOND; This sets the A & B inputs for a high count speed
input ( 0 to 10 KHz).
LO CPS - LOW COUNTS PER SECOND; This sets the A & B inputs for a low count speed
input ( 0 to 40 Hz).
NOR ## - NORMALIZATION FACTOR; This is an averaging factor (00 to 99). Higher
settings provide more normalizing (averaging) for a more stable display. Derived from the
equation:
(OLD DATA x "NOR" + NEW DATA)
("NOR" + 1)
DLY ## - DELAY FACTOR; The amount of time (02 to 24 sec.) that the unit will "look" for
valid input data before the display defaults to zero.
LOC - LOCK; This portion of the programming menu sets the security lock parameters.
LC ALL - LOCK ALL; This sets the unit to lock the program and the presets when the lock is
"on". The Presets can be viewed but not changed.
LC PRG - LOCK PROGRAM; This sets the unit to lock the program when the lock is "on".
The Presets can be viewed and changed.

5
CODE - CODE; This message flashes for approximately 3 sec. and is followed by the
existing lock code.
RELAY - RELAY; This portion of the programming menu sets up the relay output configura-
tions.
A RATE - A RELAY ASSIGNED TO A RATE; This assigns the A relay to the rate of A
(display A). When the rate of the A input equals or exceeds Preset A, relay A will activate.
A NET - A RELAY ASSIGNED TO NET; This assigns the A relay to the net value of the A &
B inputs (display C). When the net value (display C) equals or exceeds Preset A, relay A
will activate.
HYS - HYSTERESIS; This sets the hysteresis value for relay A. This prompt is displayed for
approximately 3 seconds.
A ##### - This is the existing hysteresis value. This value is the number of units below
the preset that the output will remain "on". The hysteresis value will assume the same
decimal location as the preset. EXAMPLE: Prest A set at 100, Hys A set at 10. Output A
will activate when the display equals 100 and remain activated until the display falls below
90 (10 below preset A).
B RATE - B RELAY ASSIGNED TO B RATE; This assigns the B relay to the rate of B
(display B). When the rate of the B input equals or exceeds Preset B, relay B will activate.
B NET - B RELAY ASSIGNED TO NET; This assigns the B relay to the net value of the A &
B inputs (display C). When the net value (display C) equals or exceeds Preset B, relay B
will activate.
HYS - HYSTERESIS; This sets the hysteresis value for relay B. This prompt is displayed for
approximately 3 seconds.
B ##### - This is the existing hysteresis value. This value is the number of units below
the preset that the output will remain "on". The hysteresis value will assume the same
decimal location as the preset. EXAMPLE: Prest B set at 1000, Hys B set at 100. Output
B will activate when the display equals 1000 and remain activated until the display falls
below 900 (100 below preset B).
A##### - DISPLAY A; When in the run mode , display A ( rate of input A) is displayed with
an "A" in the left side of the display.
B##### - DISPLAY B; When in the run mode , display B ( rate of input B) is displayed with
a "B" in the left side of the display.
C##### - DISPLAY C; When in the run mode , display C ( net value of A & B) is displayed
with a "C" in the left side of the display.

6
A B C D E
RST
ENTER LOCK PRE A PRE B VIEW PRGM
FRONT PANEL OPERATIONS
Press to RESET
in operating
mode; Press to
"ENTER" in
programming
mode.
Press to "enter
LOCK code for
panel lock.
Press to view or
change Preset A Press to view or change Preset B Press to alter- nately view A, B
and C dispays.
Press to cycle
through PRO-
GRAM choices;
Press to step
through set up
choices in
program mode.
PROGRAMMING FLOWCHART
START HERE
FACTOR RATE
DP LOC
LOC
LC ALL LC PG
CODE
RUN MODE
RELAY
RUN MODE
RUN MODE
DP F A
#####
DP F B
#####
A / B
A - B /B
A - B
LO CPS HI CPS
NOR ##
DLY ##
A RATE A NET
HYS
A ####
B RATE B NET
HYS
#####
B ####
RUN MODE
ENTER
PRGM
ENTER
ENTER
ENTER
ENTER
ENTER
ENTER
ENTER
PRGM
PRGM
PRGM
ENTER
ENTER
ENTER
ENTER
ENTER
PRGM
ENTER
PRGM
ENTER
PRGM
ENTER
ENTER
ENTER
PRGM
ENTER
ENTER
ENTER
PRGM

7
PROGRAMMING
REMARKS
Thissectionofthemenuisusedtoset
the scaling factors for inputs A & B.
Keyinthedesireddecimallocationfor
factor A and pressENTER.
Key in the desired scaling factor for
input A and press ENTER .
Keyinthedesireddecimallocationfor
factor B and press ENTER .
Key in the desired scaling factor for
input B and press ENTER .
Key in the desired decimal location
and press ENTER.
Press the PRGM key to step through
choices. Press ENTER to "enter" dis-
played choice.
Press the PRGM key to step through
choices. Press ENTER to "enter" dis-
played choice..
Key in the desired normalizing (aver-
aging) factor (00 to 99). Higher set-
tings provide more normalizing (aver-
aging) for a more stable display.
Keyinthedesireddelay(window)value
(02 to 24). Press ENTER to "enter"
displayed value.
DISPLAY
FACTOR
DP F A
#####
DP F B
#####
FACTOR
RATE
DP LOC
A/B, A-B or
A-B/B
LO CPS or HI CPS
NOR ##
DLY ##
STEP
1
SETTING
SCALING
FACTORS
PRESS
STEP
2
SETTING
RATE
DISPLAY
PRGM
ENTER
ENTER
ENTER
ENTER
PRGM
PRGM
ENTER
ENTER
ENTER
ENTER
ENTER

8
STEP
3
SETTING
PANEL
LOCK
PRESS DISPLAY REMARKS
FACTOR
RATE
LOC
LC ALL
or
LC PRG
CODE
flashes
followed by...
#####
FACTOR
RATE
LOC
RELAY
A RATE
or
A NET
HYS
flashes
followed by...
A ####
B RATE
or
B NET
HYS
flashes
followed by...
B ####
Press the PRGM key to step through
choices. Press ENTER to "enter" dis-
played choice.
Thisisthe security lock code. To change
press the keys under the digits to be
canged and press ENTER to "enter" dis-
playedvalue. RECORD THIS NUMBER
FOR FUTURE USE!!
Press the PRGM key to step through
choices. Press ENTER to "enter" dis-
played choice.
Keyindesiredhysteresisvalue and press
ENTER.
Press the PRGM key to step through
choices. Press ENTER to "enter" dis-
played choice.
Keyindesiredhysteresisvalue and press
ENTER.
STEP
4
SETTING
THE
RELAYS
PRGM
PRGM
PRGM
ENTER
PRGM
PRGM
PRGM
PRGM
ENTER
ENTER
ENTER
ENTER

9
SETTING THE PRESETS & PANEL LOCK
PRESS DISPLAY REMARKS
PRE A = Preset A; The set point at which
output A will trigger. If the displayed
value is not the desired preset, press
the key(s) under the digit to be changed.
PRE B = Preset B; The set point at which
output B will trigger. If the displayed
value is not the desired preset, press
the key(s) under the digit to be changed.
Key in the lock code (see programming
step 3) by pressing the keys under the
digits to be changed. Each time a key is
pressed the digit will increment one.
Press the ENTER key to enter the dis-
played code.
After the code is entered the unit will
display LOC (unit is locked) or UN LOC
(unit is un-locked). This message will
be displayed for approximately 3 sec-
onds before the unit returns to the run
mode.
PRE A
Followed by...
#####
( Preset A value)
PRE B
Followed by...
#####
( Preset B value)
CODE
Followed by...
0
LOC
or
UN LOC
SETTING
THE
LOCK
STATUS
LOCK
PRE B
PRE A
SETTING
THE
PRESETS
ENTER

10
CALCULATING THE K FACTORS
Each input (A & B) has a seperate K factor.
The K factor (divider) is the number of pulses
per the desired unit of measure. The K fac-
tor can be any 5 digit number from .0001 to
99999. The K factors for A & B can be
easily calculated by following two simple
steps.
STEP 1 - Calculate a base K factor:
The base K factor is the number of pulse per
the desired unit of measure. Calculate the
base K factor using:
Pulses = Base K factor
Units value
EXAMPLE #1:
An Encoder with 100 pulses per revolution is
sensing material. 1 Revolution of the shaft
equals 1 foot of material.
Base K factor = 100 (pulses) = 100
1 (foot)
EXAMPLE #2:
An inductive proximity sensor is sensing a
notch on a paper roll (1 pulse per revolu-
tion). Each revolution of the paper roll equals
3 meters of paper.
Base K factor = 1(pulse) =.3333
3 (meters)
STEP 2 - Calculate the rate K factor:
The rate K factor is the actual number to be
programmed into the unit. Caculate the rate
K factor using:
Rate K factor = Base K factor
Time conversion factor
TIME CONVERSION FACTORS
Desired rate reading Factor
Rate Per Second 1
Rate Per Minute 60
Rate Per Hour 3600
EXAMPLE #1:
Using the base K factor from example #1
above, the desired rate reading is Feet Per
Hour.
Rate K factor = 100 (base K factor) = .0277
3600 (time factor)
EXAMPLE #2:
Using the base K factor from example #2
above, the desired rate reading is Meters
Per Minute.
Rate K factor = .3333 (base K ) = .0055
60 (time factor)
The Rate K factor is the number to enter in
the factor section of the program menu (see
Programming Step 1).
TIME CONVERSION CHART
To Convert: Divide By:
Sec. to Min. 60.00
Sec. to Hrs. 3600
Min. to Sec. .01667
Min. to Hrs. 60.00
Hrs. to Min. .01667
Hrs. to Sec. .00028

11
INTERFACE CARD RS 232/422 OPERATION
RS 232/422 SET-UP:
All serial communication mode changes must be
done through serial communications. Mode
changes cannot be done through the front panel.
To initialize the unit, place a jumper between pin
7(+12V )[bottom board] and pin 1(init) (DB -9
connector) on initial power up. The unit de-
faults to: 300 baud rate,"MARK" parity and de-
vice number 01. To enter the program mode you
must set your terminal for 300 baud rate and
"MARK" parity. Next, type D1(s), (s)= space
bar. The unit will echo back "DEVICE #1:".
Now type EP (enter program) and a carriage
return (enter). The unit will echo back "PRO-
GRAM SETTING". You are now in the pro-
gramming mode.
SETUP PROCEDURE:
The following sections consists of the communi-
cations setup options as they appear in the
menu. (If you wish to exit the program mode, at
any time you can hit the "escape key" (Hex
Code: 1B) and the unit will save the changes
made but not effect the remaining data values.)
When each section of the setup menu is dis-
played, the current data will appear in the < >
signs. If you wish to change the data, type in
the number of the desired choice and press return
(enter). If you wish to keep the current data,
simply press return.
DEVICE NUMBER:
Each unit in the hook-up must be assigned it's
own device number (1 to 99). Zero is reserved
for a dedicated hook-up to only one terminal,
and it's transmit output line remains in an "on"
active state. The device number is entered in the
program mode. The unit will prompt you:
DEVICE# <XX>?
If XX is the desired device number press return
(enter), If not enter the desired number after the
question mark and press return (enter).
BAUD RATE:
The baud rate is the speed at which data is trans-
mitted, expressed in bits per second. Baud rates
of 300, 600, 1200, 2400, 4800 or 9600 are avail-
able. When in the baud rate section of the menu,
the unit will list :
BAUD RATES:
1:300 2:600 3:1200
4:2400 5:4800 6:9600
then prompt you:
BAUD RATE <300>?
Press return (enter) if this is the desired baud rate
or enter the assigned number of one of the six
possible baud rates. If an invalid baud rate is
entered the unit will prompt you to choose an-
other baud rate. This will occur until a valid
baud rate is entered or escape is pressed.
PARITY:
Parity is a bit of information that is inserted be-
fore the stop bit and is used to help check if the
transmission is correct. When setting the parity
you may select "ODD" (parity bit is logic 0 if
total number of logic 1's in the first seven data
bits is odd), "EVEN" (parity bit is logic 0 if total
number of logic 1's in the first seven data bits is
even), "MARK" (parity bit is always logic 1 -
High / Mark) or "SPACE" (parity bit is always
logic 0 - Low / Space). If a "MARK" parity is
chosen, it will appear that two stop bits are used.
Use the "MARK" parity with terminals using
parity "OFF" or "NONE". These terminals ig-
nore the parity. The unit does not check the
parity but does transmit the parity chosen. When
setting the parity, the unit will print:
PARITIES:
MARK-0 SPACE-1 EVEN-2 ODD-3
Then the unit will prompt you:
PARITY<MARK>?
If this is the desired parity press return (enter), if
it isn't enter the number of the desired parity then
press return (enter).

12
STROBE LIST:
The serial interface card is also equiped with a
strobe line. When the strobe line is triggered, a
chosen set of data will be transmitted to be dis-
played or printed. The selections for the display
list are entered in the program mode. Enter "1"
to add selections to the list and enter "0" to de-
lete selections from the list. The seven available
items for the strobe display list are: (1) Preset A,
(2) Preset B, (3) K-Factor A, (4) K-Factor B, (5)
Rate of A, (6) Rate of B, (7) Rate of C. When
setting the strobe list the unit will print :
ENTER STROBE LIST:
DO NOT DISPLAY-0 DISPLAY-1
The unit will prompt you:
PRESET A<DISPLAY>?
PRESET B<DISPLAY>?
K-FACTOR A<DISPLAY>?
K-FACTOR B<DISPLAY>?
RATE A<DISPLAY>?
RATE B<DISPLAY>?
RATE C<DISPLAY>?
If the above choices are entered, when the strobe
line is triggered (3-30V positive pulse) the unit
will transmit:
DEVICE# 1:
PA XXXXX
PB XXXXX
KA XXXXX
KB XXXXX
DA XXXXXX
DB XXXXXX
DC XXXXXX
(SEE COMMANDS BELOW FOR DESCRIP-
TION OF COMMAND CODES).
Each time the strobe line gets triggered the unit
will transmit this data unless the program mode
is entered and the strobe list altered.
After these four items have been entered they
will remain unaltered unless the program mode
is entered again and the values changed. The
unit is now set and must be addressed by it's
device number to come on line again.
SERIAL INPUT COMMANDS:
To get a unit on line you must address it by it's
device number. This is done by typing DXX(S),
XX= device number. The unit comes on line
and echos back DEVICE# XX. Insure that "DE-
VICE# XX:" is received before requests are sent.
The unit is now ready to receive a command or
string of commands seperated by a space. A
carriage return (enter) will enter the commands
and processing of requests begins. The carriage
return (Hex Code "D") puts the unit "off line"
after data is processed.
COMMANDS:
EP...........Unit will enter program mode.
DA..........Unit will display (transmit) Rate A.
DB..........Unit will display (transmit) RateB.
DC..........Unit will display (transmit) RateC.
KA..........Unit will display K-factor A.
†*KA(S)XXXXX....Unit will load K-factor A
with entered number.
KB..........Unit will display K-factor B
†*KB(S)XXXXX....Unit will load K-factor B
with entered number.
PA...........Unit will display Preset A.
†PA(S)XXXXX....Unit will load Preset A with
entered number.
PB...........Unit will display Preset B
†PB(S)XXXXX....Unit will load Preset B with
entered number.
RR..........Relays will drop out if they are in hys-
teresis.
RN..........This resets (updates) normalization.
*THE UNIT WILL RECOGNIZE A DECI-
MAL IF ONE IS PLACED IN ANY OF
THESE DATA VALUES.
†THE UNIT WILL ONLY RECOGNIZE
THE LAST FIVE DIGITS ENTERED.

13
The following is an example of requests and re-
sponses:
Transmit from terminal Receive from unit
(s)=Space
D5(s) [Unit #5 Activated] DEVICE# 5:
PA(s)12345(s)PA PA 12345 PA
KA(s)1576(s)KA KA 1576 KA
KB(s)6751(s)KB KB 6751 KB
RR(s)RN [RETURN] RR RN
(UNIT PRESETS AND A & B K-FACTORS
ARE SET AND BOTH THE RELAYS AND
THE NORMALIZATION ARE RESET)
12345
1576
6751
SERIAL INTERFACE OPERATION:
Data is received and transmitted over standard
EIA RS232 or RS422 levels. Each ten bit char-
acter is made up of a start bit, seven bit ASCII
code, a parity bit and a stop bit. Device number,
baud rate, parity and strobe list are entered in the
program setup mode and will remain in memory
even if power is lost.
The input impedance of RS232 is 3KΩto 7KΩ
worst case. The terminal addressing the unit
must be capable of driving all loads in the loop.
The input impedance of RS422 is much higher
and there should be no problem driving as many
as 99 units. The transmit line remains in a high
impedance "off" state until addressed. Only one
unit is to be on line at a time!!! More than one
unit on line could damage the unit or destroy the
transmitted data.
When the unit is active (on line) it will operate in
a full duplex, echo back mode, so that data sent
from the terminal will be transmitted back for
verification. When the unit is "on line", use the
proper serial transmit commands to request data
or set a new value. Up to 80 characters of data
can be linked together and transmitted to the unit
in a string as long as there is a space between the
commands. If an error is made, a correction can
be made by back spacing and retyping correct
data before the return (enter) is sent. Once a
return (enter) is sent, the unit begins processing
the data and will transmit the requested data on a
non-priority basis over the data transmit line. A
keypad entry or incoming data will halt the data
communication cycle. Therefore, there should
be a pause after data is requested to insure that
all data has been transmitted before making an-
other request or addressing another unit. If the
unit is not busy, it should not take longer than
300 msec to process each request. To find the
cycle time to process and transmit a request, cal-
culate the bit transmit time by using this for-
mula: [(1÷baud rate) x (80) + .005] x number of
requests made. This time will be extended if the
unit must service the front keypad. If transmis-
sion has not started within two seconds after data
is requested, it can be assumed that there is a
problem. The unit transmits a carriage return
and line feed after each data value. Any new
communication must be started with DXX(S)
(device number and space).
RS232/RS422 -PC INTERFACE:
The following BASIC program is for setting up
RS232/RS422 on serial port (#1) at 300 baud.
Run this program after connecting the serial
interface connections.
10 SCREEN 0,0:WIDTH 80
20 CLS:CLOSE
30 OPEN "COM1:300,n,7,1,CS,DS,CD" AS #1
40 ON ERROR GOTO 110
50 B$=INKEY$
60 IF B$< >"" THEN PRINT #1,B$;
70 IF EOF (1) THEN 50
80 A$=INPUT$ (LOC(1),#1)
90 PRINT A$;
100 GOTO 50
110 RESUME
See the following page for RS232/RS422 serial
communication wiring.

14
RS232 / RS422 WIRING
COMPUTER HOOKUP:
RS 232: When connecting the unit to a computer
with RS 232 communication, only three connec-
tions are needed. These connections are: Receive
data, Transmit data and Ground. The connections
should be made as follows:
DP -9 CONNECTOR COMPUTER
Transmit data (pin 2) Receive data
Receive data (pin 3) Transmit data
Ground (pin 5) Ground
RS 422: When connecting the unit to a computer
with RS 422, five connections are needed. These
connections are: Receive data A (+), Receive data
B (-), Transmit data A (+), Transmit data B (-) and
Ground. The connections should be made as fol-
lows:
DP -9 CONNECTOR COMPUTER
Transmit data A(+) (pin 2) Receive data A(+)
Transmit data B(-) (pin 7) Receive data B(-)
Receive data A(+) (pin 3) Transmit data A(+)
Receive data B(-) (pin 8) Transmit data B(-)
Ground (pin 5) Ground
PRINTER HOOKUP:
When connecting the unit to a printer, you must
first program the desired baud rate, parity and
strobe list with a computer. After the unit is
programmed it can be connected to the printer.
Connect the transmit line(s) of the unit to the
receive line(s) of the printer and be sure that both
devices have common grounds. When the strobe
line is triggered the unit will transmit the selected
strobe list which you had previously programmed.
TRANSMIT PIN (2)
GROUND PIN (5)
RECEIVE PIN (3)
TRANSMIT A(+)PIN (2)
TRANSMIT B(-) PIN (7)
RECEIVE B(-)PIN (8)
RECEIVE A(+)PIN (3)
GROUND PIN (5)
RS 232
RS 422
12345
6789
RS 232
1. INITIALIZE
2. TRANSMIT
3. RECEIVE
4. N/C
5. GROUND
6. STROBE
7. N/C
8. N/C
9. N/C
RS 422
1. INITIALIZE
2. TRANSMIT A (+)
3. RECEIVE A (+)
4. N/C
5. GROUND
6. STROBE
7. TRANSMIT B (+)
8. RECEIVE B (+)
9. N/C
TRANSMIT A (+) PIN (2)
GROUND PIN (5)
+12V PIN 7
(bottom board)
STROBE PIN (6)
TRANSMIT B (-)PIN (7)
RS 232
RS 422
TRANSMIT PIN (2)
GROUND PIN (5)
+12V PIN 7
(bottom board)
STROBE PIN (6)

15
TROUBLESHOOTING GUIDE
PROBLEM POSSIBLE CAUSES SOLUTIONS
Power is applied to unit but
the display does not light.
Unit works but occasionally
the display freezes or skips
counts.
Input signal is connected but
the display reading is inaccu-
rate.
Any display (A,B or C)
reading FFFFF.
Display C reading 0
1. AC or DC power wiring is
incorrect.
1. Line noise is effecting the
processor due to a current
spike or surge.
1. Input wiring is incorrect
2. Scaling K factors are incor-
rect.
3. Transmitting device is de-
fective.
4. Unit is defective.
1. Display is in overflow con-
dition.
1. This will be displayed if:
A-B= 0 orwhen the unitis set
forA÷BorA-B÷BwhereAorB
equals 0.
1. Recheck power wiring.
1. Use a different power sup-
ply or install a surge suppres-
sor.
1. Recheck input wiring.
2. Recheck K factor settings.
3.Replacetransmittingdevice.
4.To confirm, set K factors @
1. Apply a 3-30V signal @
1Hz to input A (pin 5). When
viewing the A display the unit
should display the frequency
valuethatisapplied. Ifnotcall
factory for an RMA#.
1. Change the decimal point
location.
1. Check input wiring.
2. Be sure display C is set at
desired reading.
IF YOU HAVE ANY OTHER PROBLEMS, PLEASE CALL THE FACTORY.

Wehopeyouwillbe pleasedwith ourproduct. Ifyouhaveanyquestionsconcerningour
warranty,repair,modificationorreturnedgoodsprocess,pleasecontactyourlocal distributor.
HOW TO ORDER:
Kessler - Ellis Products Co.
10 Industrial Way East
Eatontown, NJ 07724
800-631-2165 • 732-649-7100
Fax: [phone]
WARRANTY
This product is warrantied against defects in materials
and workmanship for a period of two (2) years from the date
of shipment to Buyer.
The Warranty is limited to repair or replacement of the
defectiveunitattheoptionofthemanufacturer.Thiswarranty
is void if the product has been altered, misused, dismantled,
or otherwise abused.
ALL OTHER WARRANTIES, EXPRESSED OR IM-
PLIED, ARE EXCLUDED, INCLUDING BUT NOT LIMITED
TO THE IMPLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE.
Series
Protrol= dual ratemeter and net rate
(A-B) ratio (A ÷B) or draw (A-B)÷B
Operating Voltage
A= 110 VAC ±15% or 12 to 15 VDC
B= 220 VAC ±15% or 12 to 15 VDC
C= 24 VAC ±15% or 12 to 15 VDC
Options
1= RS232 communications
2= RS422 communications
M= Mag. Input; 30 mV input for Inputs A & B
Accessories
Separate non keyboard panel order # 34235
Separate keyboard panel order # 34237
SAMPLE: PR A 1