Reno A & E S-1200 Operations Manual
Model S-1200 Series
Operations Manual
Two Channel Menu Driven Programmable Inductive Loop
Detector
Built-in Loop Analyzer for Each Channel
This manual contains technical in formation for the
Model S-1200 Series Loop Detector
pn 889-1903-01 Revision: April 2020
THE FOLLOWING PRODUCT WAS DESIGNED, INSPECTED , TESTED AND
MANUFACTURED IN THE USA BY EBERLE DESIGN, INC. IN PHOENIX, ARIZONA.
INFORMATION CONTAINED HEREIN IS PROPR IETARY TECHNICAL INFORMATION OF
EBERLE DESIGN, INC. PUBLICATION, REPRODUCTION OR USE IN WHOLE OR PART IS
NOT PERMITTED EXCEPT UNDER TERMS AGREED UPON IN WRITING. ALL
REGISTERED TRADEMARKS OF EBERLE DESIGN INC. ARE UNDER
IT IS AN EBERLE DESIGN, INC. RECOMMENDATION THAT EACH UNIT BE TESTED
AT LEAST ANNUALLY TO ENSURE COMPLIANCE WITH FACTO RY
SPECIFICATIONS AND MEETS PROPER OPERATIONAL STANDARDS. THE
RESULTS OF THIS TESTING WILL BE DOCU M EN T ED .
© COPYRIGHT
MAINTENANCE NOTE
Model S-1200 Operations Manual
Table of Contents
Section 1 General Description .......................................................................................................... 1
Section 2 General Characteristics .................................................................................................... 3
2.1 Loop Frequency ..................................................................................................................... 3
2.2 Sensitivity .............................................................................................................................. 3
2.3 Presence / Pulse ..................................................................................................................... 3
2.4 Call Delay .............................................................................................................................. 3
2.5 Call Exte ns ion ........................................................................................................................ 3
2.6 Max Presence Timer .............................................................................................................. 3
2.7 End-Of-Green (EOG) ............................................................................................................. 4
2.8 Option 1: Loop Inductance Display ....................................................................................... 4
2.9 Option 2: Loop Inducatnce -∆L/ L Display ............................................................................. 4
2.10 Option 3: Call Ext ension Control ......................................................................................... 4
2.11 Option 4: Noise Filter .......................................................................................................... 4
2.12 Option 5: Phase Green Loop Compensation ........................................................................ 5
2.13 Option 6: Vehicle Counting Display .................................................................................... 5
2.14 Option 7: Vehicle Counting Loop Configuration ................................................................. 5
2.15 Option 9: Third Card Passage .............................................................................................. 6
2.16 Option 10: Direc tional Logic ............................................................................................... 7
2.17 Option 11: Audible Detect Signal ........................................................................................ 7
2.18 Option 12: Detector Disconnect .......................................... Error! Bookmark not defined.
Section 3 Specifications ..................................................................................................................... 9
3.1 Physical .................................................................................................................................. 9
3.2 Electrical ................................................................................................................................ 9
3.3 Operational ............................................................................................................................ 9
3.4 Table: Sensitivity, -∆L/L, and Response Time ..................................................................... 10
3.5 Table: Default Settings ......................................................................................................... 10
3.6 Table: Pin Assignments ....................................................................................................... 11
Section 4 User Interface ....................................................................... Error! Bookmark not defined.
Section 5 Installation and Set-Up ................................................................................................... 12
5.1 Program Mode Display Screens ........................................................................................... 13
5.2 Normal Mode Display Screens ............................................................................................ 17
5.3 Loop Fail Indications ........................................................................................................... 21
5.4 Setting Sensitiviy using the Bargraph .................................................................................. 22
5.5 Setting Sensitivity for Motorcycle Detection using the Bargraph ........................................ 23
5.6 Full Restore to Factory Default Settings .............................................................................. 23
5.7 Display Test ......................................................................................................................... 23
Section 6 Block Diagram ................................................................................................................ 24
Section 7 The o ry of Operation ....................................................................................................... 26
Section 8 Maintenance and Troubleshooting ................................................................................ 27
8.1 Troubles hooting Power Problems ........................................................................................ 27
8.2 Troubleshooting Initialization Problems .............................................................................. 27
8.3 Troubleshooting Loop Fail Problems ................................................................................... 28
8.4 Troubleshooting Intermittent Loop Fail Problems ............................................................... 29
8.5 Troubleshooting Intermittent Detector Lock-Ups ................................................................ 29
8.6 TroubleshootingDelay Problems .......................................................................................... 30
8.7 Things to Know About loops ............................................................................................... 30
Section 1 General Description
This Operation Manual was written for peop le installing, operating, and maintaining Reno A & E Model S1200 Series inductive loop vehicle detectors. The Model S-1200 is a two channel, shelf mount type, inductive
loop vehicle detector designed to meet or exceed NEMA Standards TS 1-1989.
The Model S-1200 incorporates a microco ntroller tha t monito rs and proce sses signals from two sepa rate loop /
lead-in circuits and two Phase Green Inputs. The microcontroller uses these inputs to d ete rmine how to control
the detector outputs. A Liquid C rysta l Display (LCD), t wo light e mitting diodes ( LEDs), and four front pa nel
pushbu tto ns a re us ed t o dis pla y and pr ogra m a ll det ect or funct io ns. Several diagnostic modes are available to
aid technicians and service personnel in troubleshooting detectio n proble ms.
The use of a LCD is what distinguishes this detector from that of other manufacturers. It allows more
information, never before available, to be displayed to the user d uring normal operation of t he detector. The
LCD makes it easy to view and adjust all programmable detector options and settings. It is no longer necessary
to check or change detector settings with DIP switches. An eight-segment bargraph at the top of the LCD can
be used to provide a graphical represe ntation o f the relative c hange of inducta nce as seen by the detector at the
current sensitivity level. The bargraph automatically takes into account loop size, loop inducta nce, number of
loops, number of turns, loop geometry, lead-in length, etc. The bargraph functions as a sliding scale that relates
to the programmed Sensitivity Level. The first (left-most) bargraph segment represents the minimum
inductance change necessary for the detector to output a call at the currently selected sensitivity level. Larger
inductance changes will indic ate more segments. Each addit ional segment indicates that the ne xt sensitivity
level has also been met or exceeded. When used in this manner, the bargraph provides an indication of whether
the sensitivity is set too high or too low, fac ilita ting the ideal setting of the sensitivity level.
All programmed settings a re stored in non-volatile memory and ca n only be changed by programming new
settings. Loss of power or a detector reset will not change any of the progra mmed settings. If a loop failure
occurs, the LCD w i l l displa y t he type of loop fa i l ur e a s L lo (for -25% change or shorted loop conditio ns) or L
hi (for +25% change or open loop condit ions). Each loop failure is counted and accumulated in the Loop
Failure Memory. The number of loop failures since the last detector reset or power interruption is very useful
information to have available during analysis of intermittent loop operation.
The Model S-1200 Series detector is a scanning detector. T he scanning operation sequentially activates the ON
and OFF cycle of each channel’s oscillator. Since only one channel’s loop(s) is (are) active at a given time,
crosstalk between adjacent loops connected to the same scanning detector is minimized. The Model S-1200
Series’ unique scanning process also disconnects the capacitors and dampens the oscillator during the OFF
cycle. This eliminates oscillation past the OFF point (ringing or deca y) every time the loop circ uit is scanned,
which can result in crosstalk. When operating in the Program Mode, t he Model S-1200 Series displays the r eal
time loop frequency reading for each cha nnel. The eight frequency settings can be incremented or decremented
to provide precise frequency readings, removing any guessw ork when cha nging frequ ency settings to eli minate
crosstalk. NOTE: Adjacent loops conne cted to different channels of a non-scanning detector or different
scanning detectors should be set to different frequencies with maximum separat ion.
The Reno A & E Model S-1200 Serie s uti lizes the fi rst ma jor in nova tion i n induc tive loop detectors since the
introduction of digital detecto rs. The pr ogra mming of a ll of t he detect or’s para meters with four nor mally ope n
pushbutton switches not only simplifies setup b y removing binary coded DIP switche s, but also increases the
reliability of the detector by eliminating the dependence on switch contacts d uring normal operation. The
detailed descriptions displayed on the LCD eliminate the interpretation of numerous LED flash rates to
determine the detector status. In add ition, the Model S-1200 offers the versatility of software control. Special
functions are possible with a simple change of the socket-mounted microprocessor. Special functions are
defined as unique options (e.g. Option 6, Option 12, etc.). Special option functions are activated t hrough the
use of the LCD menu option programming.
The Model S-1200 Series is comprised of the following detectors:
S-1200-R For NEMA TS 1-1989 app lications calling for a two channel, 120 volt
S-1200-R-12D For NEMA TS 1-1989 applications calling for a two channel, 12 volt
S-1200-R-240A For NEMA TS 1-1989 app lications calling for a two channel, 240 volt
S-1200-SS For NEMA TS 1-1989 app lications calling for a two channel, 120 volt
AC, she lf mo unt d et ec to r w it h re la y out p ut s a nd a n audible detect signal
(buzzer).
DC, she lf mo unt d et ec to r w it h re la y out p ut s a nd a n aud ib le d et ec t s ig na l
(buzzer).
AC, she lf mo unt d et ec to r w it h re la y out p ut s a nd a n a udib le det ec t s ig na l
(buzzer).
AC, shelf mount detector wit h solid state outputs and an a udible detect
signal (buzzer).
889-1903-01 Model S-1200 Operations Manual Page 1 of 28
S-1200-SS-12D For NEMA TS 1-1989 applications calling for a two channel, 12 volt
S-1201-R For NEMA TS 1-1989 app lications calling for a two channel, 120 volt
S-1201-SS For NEMA TS 1-1989 app lications calling for a two channel, 120 volt
DC, shelf mount detector wit h solid state outputs and an a udible detect
signal (buzzer).
AC, shelf mount detector wit h True Count
TM
outp uts , re la y outp uts , a nd
an audible detect signal (buzzer).
AC, shelf mount detector wit h True Co unt
TM
outputs, solid state outputs,
and an audible detect signal (buzzer ).
889-1903-01 Model S-1200 Operations Manual Page 2 of 28
Section 2 General Characteristics
2.1 LOOP FREQUENCY
There are eight (8) selectable loop frequency settings (normally in the range of 20 to 100 kilohertz) per
channel. The actual loop operating freq ue ncy is a function of the loop / lead-in network and the components of
the loop oscillator circuit. The digita l display of the actual loop operating frequency for each setting makes it
easy to quickly identify a nd eli minate cross talk in the most diffic ult to co nfigure intersecti ons . T he fr eq ue nc y
display is typically very stable when the loop is vacant and vehicles are not passing nearby the loops. If the
readi ng is vary i ng by more than ±1 in the last digit, this is an indicatio n of poss ible cros s talk betwee n loops.
2.2 SENSITIVITY
There are nine (9) selectable sensitivity levels per channel, plus Continuous-Call and Channel-Off. The
sensitivity levels are designed so that a one level increase actually d oubles the sensitivity and a one level
decrease halves the sensitivity. A unique bargraph displayed on the LCD makes it easy to quickly set
sensitivity at the ideal level for any loop / lead-in network configuration. (See Section 3.4 for actual detection
levels at eac h sensitivity level. )
C
ONTINUOUS-CALL: When set to t he Continuous-Call state, t he channel output is continuous ly in the Call
state regardless of the presence or absence of vehicles over the loop. The loop oscillator is disabled when in
the Cont inuous -Call state. This state is indicated b y CALL flashing on the LCD. Th is optio n is se lecte d
from the Sensitivity menu in Program Mode and is useful for checking controller response and other
troubleshooting activities.
C
HANNEL-OFF: When s et to the C han nel-O ff state, the channel outp ut is continuously in t he No Call state
regardless of the presence or absence of vehicles over the loop. The loop oscillator is disabled when in the
Channel-Off State. This state is indicated by OFF flashing o n the LCD. This opt ion is selected fro m the
Sensitivity menu in Program Mode a nd is useful for checking co ntroller respo nse and other tro ubleshootin g
activities.
2.3 PRESENCE / PULSE
One of two mutually exclusive modes of operation for each channel is available. Presence or Pulse mode is
toggled by momentarily pressing e ither the (UP) or (DOWN) button.
P
RESENCE MODE: Provides a call hold time of at least four minutes (regardless of vehicle size) and typically
one to three hours for an automobile or truck.
P
ULSE MODE: An output Pulse of 125 ±10 milliseconds duration is generated for each vehicle entering the
loop detection zone. Each detected vehicle is instantly tuned out if it remains in the loop detection zone
longer than two seconds. This enables de tection of subsequent vehicles entering the loop dete ction zone.
After each vehicle leaves the loop detection zone, the channel resumes full sensitivity within 0.5 seconds.
2.4 CALL DELAY
Each channel’s Call Delay is adjustable from 0 to 255 seco nds in one-second steps. Call Delay time s tarts
counting down when a vehicle enters the loop dete ctio n zone. The remaining C all D elay time is continuo usly
displayed on the LCD. Whene ver a Pha se Green Input (Call Delay Ove rride) signal (pin J o f the MS c onnector
of channel 1 or 2) is active, the Call Delay function for the channel is aborted and the Call De lay time is fo r ce d
to zero.
2.5 CALL EXTENSION
Each channel’s Call Extension is adjustable from 0 to 25.5 seconds in 0.1-second ste ps. Extension time starts
count ing down when the last ve hicle c lears t he loop detecti on zone. The re mainin g Call E xtensio n time is
continuously displayed on the LCD. Any vehicle e ntering the loop detection zo ne during the Call E xtension
time period causes the channel to return to the Detect state, and later, when the last vehicle clears the loop
detection zone, the full Call Extension ti me starts count ing down again. (See Option 3, Call Extension C ontrol,
for an a lternate mode of operation for C all Exte nsion.)
2.6 MAX PRESENCE TIMER
When activated, each channel’s Max Presence time r is adjustable from 1 to 999 seconds in one-second steps.
A setting of OFF turns the Max Presence timer off. The Max Presence function is used to limit presence time,
by automatically resetting the channel. If this function is enabled (ON), the Max Presence timer begins
889-1903-01 Model S-1200 Operations Manual Page 3 of 28
counting down when a call is initiated and the remaining ti me is continuously displayed on the LCD. If the
loop becomes vacant before the Max Presence timer reaches zero, the call is dropped and no automatic reset
occurs. If the End-Of-Green (EOG) function is not enabled (OFF) and the call is s til l pres ent w hen the M ax
Presence timer reaches zero, the channel then is automatically reset. If the EOG function is enabled (ON) and
the call is still present when the Max Presence time r reaches zero, the channel enters a Wait state. The Wait
state continues until either the loop becomes vacant or the Phase Green Input signal for a channel (pin J of the
MS connector) transitions fro m green to not green with the call still prese nt. If the loop becomes vaca nt first,
the call is dropped and no auto matic reset occurs. If the Phase G ree n Input trans itions from green to not green
while a channel is in a Wait state, the channel is automatically reset. The signals on pin J of the MS connectors
of channels 1 and 2 are also called Call Delay Overrides. (See Section 3.2, Phase Green Input specification for
volta ge le ve ls . )
2.7 END-OF-GREEN (EOG)
Each c hannel’s EOG setti ng can be to ggled O N or OFF by momentar ily press ing eithe r the (U P) or
(DOWN) button. The EOG function is used to synchro nize resetting of a detector with the termination of the
associated phase green. The assumption is that this is the safest point in time to reset the channel. This
assumption is based on the premise that at the termination of the associated phase green, traffic should be
moving, and therefore, a reset would not result in the loss of a call when traffic comes to rest ove r the loop(s).
The EOG function is only available when the Max Presence function is set between 1 and 999 seconds. It is
not ava ila ble w he n the Ma x Pre se nce func tio n is OFF. Whe n t he EO G fu nct ion is e nab led (ON ), t he c hanne l
will automatically be reset at the same time the Phase Green Input signal (pin J of the MS connector)
transitions from the ON state to the OFF state, if the Max Presence Time has counted down to zero and is
resting in the wait state. The signals on pin J of the MS connectors of channels 1 and 2 are also called Ca ll
Delay Override. (See Section 3.2, Phase G reen Input specifications for voltage levels.)
2.8 OPTION 1: LOOP INDUCTANCE DISPLAY
Each channel’s Loo p I nductanc e D is p la y s e t t i ng c a n b e t o g g led O N o r OFF by mo mentari l y pr es sing eit her the
(UP) or (DOWN) button. When this opt ion is e nabled (ON ), the LCD displays the tota l loop ind uctance
(actual loop inductance plus actual lead-in inducta nce) i n mic ro henr ies f or lo op ind uc tanc e va lues in the ran ge
of 20 to 2500 microhenries. By recording the inductance of the loop / lead-in circuit when it is first insta lled,
the actual inductance can be compared to the expected inductance to help identify defective loop / lead-in
circuits. Loop / lead-in inductance can be easily estimated using the simple formulas included in Section 8.7 of
this manual. NOTE: Enabling t his option activates it for bot h channe ls. This optio n is auto matically disabled
15 minutes after activation or on loss of power.
2.9 OPTION 2: LOOP INDUCTANCE -∆L/L DISPLAY
Each cha nnel’ s Loop I nducta nce -∆L/L Display setting can be toggled ON or OFF by momentarily pressing
either the (UP) or ( D O W N) button. W he n t h is o pt ion is enab led (ON), t he LCD d isplays t he perce ntage
of induc t a nc e c hange (-∆ L/L value) during the Call state. To fac ilitate t he view ing of the maximu m amo unt of
change in the -∆L/L value while traffic is in motion over the detection zone, the channel holds the peak -∆L/L
value for a period of two seconds. NOTE: Enabling this option activates it for both channels. This option is
automatically disabled 15 minutes after activation or on loss of power.
2.10 OPTION 3: CA L L EXTENSION CONTROL
Each channel’s Call Extens ion Co ntro l set ting ca n be t oggl ed ON or OF F by mo me ntar ily pr essi ng ei ther t he
(UP) or (DOWN) button. Whe n this optio n is enable d (ON), the c hannel wi ll extend ca lls for the
progra mmed ext ensio n time only when the Phase Gre en Inp ut signa l (pin J of the MS connector) is active.
When th is opt ion is OF F, the channe l ex tend s ALL cal ls for t he pr ogra mmed exte nsio n time . The s igna ls o n
pin J of the MS connectors of channels 1 and 2 are also called Call Delay Overrides. (See Sect ion 3.2, Phase
Green Input specifications for voltage levels.)
2.11 OPTION 4: NOISE FILTER DISABLE
The detector’s Noise Filter Disab le setting can be toggled O N or OFF by mo mentarily pressing either the
(UP) or (DOWN) button. When Option 4 is enable d (ON), internal noise filtering is disabled thus providing
a faster response time. When this option is OFF, internal noise filtering is utilized. When the detector is used
in speed and/or occupancy applicatio ns, the noise filter should be disabled ( i.e. Option 4 ON) to provide the
most accurate data possible. It is recomme nded that this option not be activated. The factory default setting of
OFF provides stable operation in high cross talk environments. NOTE: Enabling this option activates it for
both channels. Changing the setting of this feature will reset both detector channels.
889-1903-01 Model S-1200 Operations Manual Page 4 of 28
The Loop Fail Count is not reset w he n t he setting of Option 4 is changed. Also, changing the setting of Option
4 will not cause the prior Loop Fail indication to cease (see Section 5.3, Loop Fail Indications).
2.12 OPTION 5: PHASE GREEN LOOP COMPENSATION
Each channel’s Phase Green Loop Co mpensation setting ca n be toggled ON or O FF by momentarily p ressing
either the (UP) or (D O WN ) b ut to n. Whe n O pt io n 5 is e nab le d (O N ), no rma l loo p c o mpe ns at io n is us ed
until the Phase Green Input signal (pin J of the MS connector) becomes active. Once the Phase Green Input
signal is active, the channel desensitizes the loop. Maximum desensitization is 0.05% (-∆L/L). This
desens it iza t io n tu nes o ut s ma ll cha n ges , s uc h as adjacent lane pickup, therefore minimizing the chance of max
timing an empty lane. Note: A small motorcycle may also be tuned out in a short period of time following the
start of Phase Green. This option is useful in minimizing false detect ion resulting from adjacent lane pickup
when a c ha nne l mu st be ru n w ith a h igh s ens it iv it y se tt in g. W he n Op t ion 5 is no t ena b led ( O FF ), no r ma l lo op
compensation is use d.
2.13 OPTION 6: VEHICLE COUNTING DISPLAY
Option 6 has two parameters, Option 6.0 and Option 6.1.
When Option 6.0 is enabled (ON) for a c hannel, the normal operating display for that channel is replaced
with the accumulated vehicle count. The unit is capable of accumulating 65,535 vehicle counts before
rolling over to zero. T he display will s how the hundreds, tens, and ones d igits until the accumulated co unt
exceeds 999. At this point t he disp lay will a lternate betwee n the ten tho usands a nd thousa nds d igits a nd the
remaining three digits for hundreds, tens, and ones.
When the detector is first powered up, the detector enters a training mode. Operation in the training mode is
indicated by the accumulated vehicle co unt flashing on the LCD. Training mode enables the detector to
identify what degree of inductance change a typical vehicle causes as it is detected. When the training
period is complete, the flashing display of the accumulated vehicle count on the LCD will cease and the
LCD will show the actual accumulated vehicle count. The most accurate vehicle counts are obtained once
the detector is operating in this mode, i.e. after the training period is complete.
Option 6.1 is used to reset the accumulated vehicle co unt for the selected channel. When Option 6.1 is
changed from the OFF state to the ON state, the accumulated vehicle count for the selected channel is reset
to zero. Option 6.1 will always be in the OFF state when first viewed. The accumulated vehicle count is
also cleared by loss of power.
2.14 OPTION 7: VEHICLE COUNTING LOOP CONFIGURATION
This feature is only available on the True CountTM version of the Mod el S-1200 detector (S-1201). The
detector’s Vehicle Counting Loop Configuration se tt ing ca n be set fro m 01 to 04 for each channel. This setting
should indicate the number of loops installed in a single lane. The setting 01 would indicate a single loop.
This could be a single 6 ΄ x 6΄ or a long loop such as a 6΄ x 50΄ Quadrupole
indicate the number of 6΄ x 6΄ loops installed in a single lane of traffic.
Several factors can influence the accuracy achieved with this detector:
1. Lanes per Detector - The detector was designed to be used in applications where each channel is used to
count vehicles in a single lane o f traffic. It is not intended to be used in applications where it is
necessary to count cars across multiple lanes of traffic.
2. Loop Geometry - In t he mu l t iple loo p s e t t i n gs (02-04), all l oops must be of the same configuration, i.e.
the same number of turns a nd t he same size. Also, all loops must be equally spaced. The idea l spac ing
for 6 ft. by 6 ft. loops is 15 ft. center to center or 9 ft. spacing between loop edges. Further, multiple
loops should always be wired in a ser ies network. This is important to e nsure that a vehicle passing
over the group of loops causes the sa me amount of ind uctance change in e ach loop. I n the single loop
setting (01), square or rectangular co nfigurations will give slightly better results than Quadrupo le
configurations.
3. Loop Placement - Loops should always be placed in the center of the traveled lane. Loops should
extend out in front o f the stop bar. For t urning move ments, loops should not e xtend so far out in front
of the s to p bar that exitin g vehicles w o u ld e x it mo re out of t he side of t he lo o p t ha n out the f ro nt o f t he
loop. If the detector is operating in the multiple loop mode and other move ments of traffic c lipping the
front edge of the loop are a concern, the detector will only count vehicles that cross more than one loop.
It will ignore all vehicles that clip a single loop.
4. Sensitivity Setting - The se nsitivit y should be set so that a single pass enger vehicle in the detection
zone creates a seven dot deflection on the bargraph on the LCD.
TM
. The remaining three settings
TM
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