Feig Electronic VEK S4C User manual

VEK S4C Manual
2023-04-24
S4C_Manual_en_5.docx
Traffic Detector - VEK S4C

Manual VEK S4C
2 11/17 FEIG ELECTRONIC GmbH
Note
Copyright 2018 by FEIG ELECTRONIC GmbH
Industriestraße 1A
D - 35781 Weilburg
http://www.feig.de
The specifications contained in this document may be changed without prior notice.
This edition replaces all earlier editions of the document.
The information in this guide has been compiled to the best of our knowledge and in good faith. FEIG
ELECTRONIC assumes no liability for the accuracy of the specifications in this guide. In particular FEIG
ELECTRONIC cannot be held liable for consequential damages resulting from improper installation.
Since errors can never be completely precluded in spite of all our efforts, we are always grateful for
corrections and suggestions.
The installation recommendations contained in this guide assume the most favourable circumstances. FEIG
ELECTRONIC assumes no liability for perfect function of the traffic detector in a foreign system environment.
Photocopying and reproduction of this guide in whole or in part as well as translations into other languages
are not permitted without prior written permission from FEIG ELECTRONIC. Also prohibited is storage of this
guide in whole or in part on modern storage devices for the purposes of further processing in data
processing systems.
Please read this manual and safety instructions carefully and in full before starting up the traffic
detector!

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Contents
1Functional Description ............................................................................................................................ 4
1.1 Vehicle detection................................................................................................................................. 5
1.2 Compensation ..................................................................................................................................... 5
1.3 Classification of vehicles ..................................................................................................................... 5
1.4 Possible outputs.................................................................................................................................. 6
1.5 Multiplexing ......................................................................................................................................... 6
1.6 Synchronisation................................................................................................................................... 7
2Settings ..................................................................................................................................................... 8
2.1 Frequency selection ............................................................................................................................ 8
2.2 Multiplexing sequence......................................................................................................................... 8
2.3 Classification ....................................................................................................................................... 9
2.4 Output modes.................................................................................................................................... 10
2.5 Response time of output signals....................................................................................................... 10
2.6 Simulation of output signals .............................................................................................................. 11
2.7 RS485 interface ................................................................................................................................ 11
2.8 CANopen interface............................................................................................................................ 11
3Initial Start-up ......................................................................................................................................... 12
4Display and Operation ........................................................................................................................... 13
4.1 Display elements............................................................................................................................... 13
4.2 (M)ode button.................................................................................................................................... 13
4.3 Factory settings ................................................................................................................................. 14
4.4 Device address ................................................................................................................................. 15
4.5 DIP switches...................................................................................................................................... 16
4.6 Synchronisation display .................................................................................................................... 18
5Mechanical data...................................................................................................................................... 19
5.1 Dimensions........................................................................................................................................ 19
5.2 Board elements ................................................................................................................................. 19
6Technical data......................................................................................................................................... 20
6.1 Approval / Standards......................................................................................................................... 21
6.2 Current consumption......................................................................................................................... 21
7Connectors and pin assignment........................................................................................................... 22
7.1 DIN connector ................................................................................................................................... 22
7.2 2x7-pole pin IDC connector for ribbon cable..................................................................................... 23
7.3 Power supply contacts ...................................................................................................................... 23
7.4 Interface contacts.............................................................................................................................. 23
7.5 Reset input ........................................................................................................................................ 23
7.6 Synchronisation connection .............................................................................................................. 23
7.7 Open Drain Outputs .......................................................................................................................... 24
7.8 Opto coupler Outputs ........................................................................................................................ 24
7.9 Fault Output....................................................................................................................................... 24
7.10 PE connection ................................................................................................................................... 24
8Accessories ............................................................................................................................................ 25
8.1 VEK S4C – connection kit ................................................................................................................. 25
8.2 Service software................................................................................................................................ 25
9Safety instructions and warnings......................................................................................................... 26
10 Functions in 4-channel mode................................................................................................................ 27
10.1 Scanning speed (4Ch) ...................................................................................................................... 27
10.2 Response sensitivity (4Ch) ............................................................................................................... 28
10.3 Hysteresis drop (4Ch) ....................................................................................................................... 29
10.4 Holding time (4Ch) ............................................................................................................................ 29
10.5 Direction recognition (4Ch) ............................................................................................................... 30
11 Notes........................................................................................................................................................ 38

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1 Functional Description
The VEK S4C traffic detector is a dual system for inductive detection of vehicles. Information about speed,
length and class of a vehicle can be provided using the measuring system (two loop principle) and its
evaluation. The data determined in this way are assembled in a data protocol and provided to a higher level
system (host computer) for further evaluation.
Features:
•4-channel induction loop detector
•two classification modules (for vehicle classification of, e.g. two lanes)
•automatic speed and length measurement
•vehicle classification in 8+1 classes according to TLS guidelines 2002
•vehicle detection and classification in both directions
•recording of the net time gap (time distance between two vehicles)
•loop dimensions according to TLS guidelines*
•automatic adjustment of the system after switching on
•continuous readjustment of frequency drifts for largely eliminating environmental influences
•sensitivity independent from loop inductance
•frequency band adjustment
•long loop supply lines possible (up to 300 m)
•simple installation using ribbon cable connection
•RS485 interface and
•CANopen Interface
•4 Open Drain outputs
•5 Bit codeable hardware address on DIN connector
•external Reset input
Other features:
•19” plug-in board, 100 mm x 160 mm (Euro card), DIN 41612 type B connector
•avoidance of mutual influencing of loop channels by using multiplexing methods
•avoidance of mutual influencing of several detectors using synchronisation
•LED display of the loop conditions
•insulation between loop and electronics
•gas surge arresters for improved surge resistance
•4 Opto coupler outputs and 1 general fault Opto coupler output
Setting options:
•five fixed frequency bands independent from loop inductance
•per classification module:
- head gap of loops
- sensitivity adjustment of loop pairs
- adjustment of the vehicle length
•classification modules can be disconnected by deactivating unused detector channels
•output can be set as presence signal, direction signal or general fault indicator, signal for excessive
speed, class-selective signal output
•hardware addresses (1..254) can be set using DIP switch (2..30) or DIN connector (2..62) and address
offset via RS485 interface
•other setting options (functions in 4-channel mode) :
- actuation threshold per channel in 255 steps
- hysteresis drop of 20-80% per channel
- holding time 1-255 minutes and indefinite per channel
- scanning speed
- direction logic
*Publisher of the TLS (Technical delivery conditions for route stations) is the Federal Highway Research Institute (BASt)
in Bergisch Gladbach

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Compatibility:
•downwards compatible to the TLS and FEIG protocol of traffic detector VEK S3-1
•software compatible to VEK S4 with plastic housing and DIN rail mounting
1.1 Vehicle detection
It is established using an LC oscillator whether a metallic vehicle is in the loop area. The output of the
channel is switched depending on the selected output function.
Loop head gap and loop length are freely selectable and adjustable (see 6 Technical data ). The optimum
loop position must be determined with appropriate measuring methods for installing the loops over reinforced
underground. The installation recommendations must be considered. It is recommended to use the standard
loop geometry TLS type 2 for best classification quality.
1.2 Compensation
A calibration is performed each time the detector is powered up or by pressing the button for longer than 1 s.
After a power interruption, automatic calibration is performed only if the supply voltage was absent for at
least 0.5 s. The calibration time is approx. 1 s if during this time no vehicles have passed through the loop.
Longer calibration times are caused by frequency instabilities; their causes must be determined and
remedied.
1.3 Classification of vehicles
The VEK S4C detector has two classification modules for vehicle detection. These can be parameterised
independently from each other.
1.3.1 Vehicle data
The typical frequency change for vehicles and its time course on two induction loops with known geometric
dimensions are used for deriving the following factors:
•vehicle class
•vehicle speed
•vehicle length
•net time gap between the vehicles
•occupied time of the loops
•travel direction
The vehicles are classified in 8+1 classes according to TLS guidelines 2002:
•car
•car with trailer
•truck
•truck with trailer
•van
•bus
•motorcycle
•articulated vehicle
•non-classifiable vehicles, e.g. lane changers
1.3.2 Traffic Jam Detection
The detector signals a traffic jam if the traffic is flowing too slowly <10 km/h. In this state, a dummy vehicle
with class = Other, l = 40 dm, v = 5 km/h is reported. Every individual vehicle is also recognised and reported
for traffic queues if the gap between the vehicles enables both loops. The jam signal will be reset when both
loops become free.
Note: A correct detection of driving direction is not guaranteed for all traffic jam situations.

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1.3.3 Classification in the case of loop fault
Speed and length measurement and classification is not possible in the case of a defective loop. A dummy
vehicle (class = Other, l = 40 dm, v = 0 km/h) is reported for every vehicle which crosses the second intact
loop. If both loops of a classification module are defect no vehicle data is reported .
Note: A loop fault is not reported if one or both loops have been intentionally deactivated as the classification
module concerned in this case is completely switched off.
1.3.4 Tailgating
If a vehicle is driving to close to the car in front, a dummy vehicle (class = Other, l = 45 dm, v= vlast vehicle) is
reported with the vehicle speed of the car in front.
Note: A correct detection of driving direction is not guaranteed for all tailgating situations.
1.4 Possible outputs
Two Open Drain outputs each are assigned to every classification module. One of the functions listed below
can also be assigned to each output:
- no function (output deactivated)
- presence of a vehicle on the loops
- direction pulse signal
- pulse for vehicle crossing with vehicle class selection
- exceeding speed limit with vehicle class selection
- speed limit compliance with vehicle class selection
The function setting is made via the serial port using PC / Laptop with service program or host computer.
Loop faults are indicated via a general fault opto coupler output. During idle state the opto coupler is active.
If a loop error occurs for longer than 1s the coupler output is deactivated. Short loop errors < 1s are ignored
for the hardware outputs, but can requested via interface.
1.5 Multiplexing
The connected induction loops are switched on and off in rapid sequence, so that current flows only through
one loop at a time. This prevents mutual interference between the loops of a detector. All loops connected to
a detector can thus operate at the same loop frequency.

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1.6 Synchronisation
To prevent mutual interference between induction loops of multiple detectors, the latter can be synchronized
with each other using a connection in the front-side ribbon cable. All detectors connected via the
synchronous line process the multiplexing sequence synchronously. Only loops which are active in the same
time window can affect each other. Assigning the loops to the time windows is done by setting the multiplex
sequence.
Note:
•Adjacent loops should be assigned to different time windows.
•Loops in the same time window should be located physically as far away from each other as possible.

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2 Settings
The settings described in the following are performed either on the RS485 interface or the CAN interface. It
is recommended that the system be equipped with an operating unit for setting the detectors. The settings
can also be made from a laptop. Setup programs are available from FEIG ELECTRONIC. An appropriate
interface converter is also required.
2.1 Frequency selection
The working frequency is set in order to prevent cross-coupling.
Cross-coupling may occur with adjacent loops or loop lines on other detectors. It is therefore important that
two or more detectors do not operate on the same frequency. A frequency separation of at least 10 kHz
should be maintained for neighbouring loops which are not connected to the same detector.
The detector operates in five frequency bands:
Band
Frequency range
0
automatic frequency setting (Factory default setting)
1
30 - 40 kHz
2
45 - 55 kHz
3
60 - 75 kHz
4
80 - 100 kHz
5
105 - 140 kHz
It is recommended that all four loops of one detector be set to the same frequency band. Multiplexing
automatically prevents cross-coupling between the 4 loops of a detector.
Note:
For loops whose inductance lies outside the recommended range (see Section 6Technical data), the
frequency band setting can be restricted. The detector may calibrate to a different frequency than shown in
the above table. This is not a problem as long as there is no cross-coupling with other loops. The currently
set frequencies should therefore be checked.
For long loop supply lines it is recommended to use band 2..4 for frequency setting.
If automatic frequency setting is activated, the VEK S4C uses the device address to choose one of the
frequency ranges above. Please check the real frequency, because it can differ from the nominal frequency.
For additional notes on preventing cross-coupling see Section 1.6 Synchronisation
2.2 Multiplexing sequence
The default multiplexing sequence is 1-2-3-4. To prevent cross-coupling with neighbouring loops of another
detector in exceptional cases, you may change the sequence (e.g. 1-4-2-3). see also Section 1.6
Synchronisation.
Attention: Changing the multiplexing sequence is only valid for the 4-channel mode and not if the
classification modules are used!

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2.3 Classification
Both classification modules of the VEK S4C detector have separate loop parameters so that relevant
parameters per classification module can be set for the vehicle detection. The loop parameters include the
head gap, the loop length, the amplitude factor for the sensitivity and the vehicle length adjustment.
•Head gap
The correct setting of the head gap is relevant for the accuracy of the speed measurement and the vehicle
length.
•Loop length
The loop type of the connected loops is adjusted using the loop length. Currently only the loop types TLS 1
and TLS 2 according to the TLS 2002 guidelines are supported. The loop type TLS 2 is assumed for a length
up to 125 cm. The loop type TLS 1 is set for lengths of more than 125 cm.
loop
lenght
head gap
loop 3
loop 4
loop 1
loop 2
Classifaction-
modul 1
Classifaction-
modul 2
Signals
OpenCollector 3
class and direction
Counter
OpenCollector 4
OpenCollector 1
OpenCollector 2
Loop allocation
is fixed
class and direction
Counter
Ouput allocation
is fixed
Loop
length
Head
gap
TLS 1 250 cm 400 cm
TLS 2 *
100 cm 250 cm
* TLS 2 is recommended !
•Amplitude factor
The loss of sensitivity due to abnormal loop dimensions, long loop lines or road surface reinforcements is
largely compensated for using the amplitude factor.
Automatic calculation of this factor is also available. By setting ‘0’ for the amplitude factor the VEK S4C
begins to evaluate the next 50 cars in the length range of 350...450 cm. If the evaluation process is finished
the VEK S4C stores the new adjustment factor in the EEPROM. An active evaluation process is indicated by
two simultaneously blinking LED for each classification module (1/2 for module 1 or for 3/4 module 2).
•Length adjustment
The measured vehicle length is corrected with the length adjustment. No vehicle length adjustment is usually
required for normal loops according to TLS with loop lines up to 100 metres.
•Output signals
As already described in 1.4 Possible outputs, each classification module can control two outputs. Refer to
the diagram above for their assignment. One of the five available functions can be set for each output.
Outputs can also be deactivated.

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•Vehicle counter
Each classification module has a 16-bit counter per vehicle class and travel direction which can be invoked
via the RS485 interface. It must be noted that the counters roll over at 65535 (216) and restart from 0. It is not
recommended to reset the counters otherwise vehicles can be lost at the time of the reset. The counters in
the detector are not protected against power failure. The detectors must either be buffered with a UPS
system or the counter readings must be regularly read and stored in the higher level system for long-term
counting.
2.4 Output modes
The following output modes can be set for the four open collector outputs:
Output mode Description
Standard output Normal output mode for presence or direction detection
General fault message Output indicates loop faults from all loops
always off Output always turned off
always on Output always turned on
Simulation Output switches constantly, e.g. for testing purposes
Inverted or non-inverted signal output can be selected for all output modes.
In the case of standard output the loop faults of the respective channel can be output together with the
logical signal. Which fault is additionally indicated can be set to loop fault (break/short) and calibration
procedure.
Factory default setting: Standard output,
Signals not inverted,
Indication of loop fault
2.5 Response time of output signals
On-delay, minimum signal duration and off-delay for the hardware output signals can be set in 100 ms
increments over a range of 0...25500ms.
Factory default setting: On-delay 0 ms
Off-delay 0 ms
Minimum signal duration 200 ms
Loop busy *
Output signal
ton
td≥tdmin
toff
ton: On-delay
toff: Off-delay
tdmin : Minimum signal duration
td: Signal duration
*Internal status: Detector has detected an object on the loop (detuning > threshold level)

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2.6 Simulation of output signals
The interface can be used to temporarily turn the outputs on or off. This allows you to implement control
tasks such as controlling traffic lights or variable message signs.
In simulation mode the output is constantly repeated according to the following scheme:
- The signal duration corresponds to the set minimum signal duration
- The pause time corresponds to the set on-delay. If no on-delay is set (0 ms), an idle time of 20s is
assumed.
For the factory set time behaviour of the output signals this means a pulse signal of 200 ms duration and an
idle time of 20 s.
2.7 RS485 interface
Baud rates: 9.6, 19.2, 38.4 kbaud
Parity: no, even, odd parity
Factory default setting: 9.6 kbaud, even parity
Refer to the RS485 documentation for the VEK S4/VEK S4C for the specification of the interface protocols.
The VEK S4C is downwards compatible with the interface protocols defined for the VEK S3. The protocols
based on the TLS defined in the VEK S3 are also supported. In these cases, one VEK S4C behaves like two
separately addressable VEK S3 units. Mixed operation of VEK S3 and VEK S4C on a common bus is not
recommended.
2.8 CANopen interface
The CANopen standard 301 according to CiA is supported.
Baud rates: 100, 125, 250, 500, 800, 1000 kbps
Refer to the CANopen documentation for the VEK S4 for the specification of the CANopen protocols. Please
look for CANopen basics in the specifications from the CiA (CAN in Automation) organisation.
Factory default setting: 250 kbps

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3 Initial Start-up
1. Installation – The 19” rack must be grounded and PE contact on the DIN connector must connected to
Ground.
 7.10 PE connection
2. Address – The detector address is set to 48 at the factory using the software address offset. All
detectors which will be operated on a common interface must be set to different addresses before initial
start-up.
 4.4 Device address
3. RS485/CAN bus termination – The RS485/CAN interface must be terminated at both and ends in
accordance with the respective specification.
 4.5.1 RS485 interface bus termination / 4.5.2 CANopen bus termination
4. RS485/CAN baud rate – Select the correct baud rate for the host computer / laptop interface. When
delivered, the baud rate for the RS485 interface is set to 9600 bps (CAN: 250 kbps). If the baud rate of a
detector is not known, this device can be reset to 9600 bps (250 kbps) by restoring the factory settings.
Note: All other parameters are also reset when the factory settings are restored.
5. Loop assignment – assign loops to the classification modules. The loops on the connections Loop1 /
Loop2 are assigned to the classification module 1 and Loop3 / Loop4 to the classification module 2
respectively.
6. Frequency selection – The loops of a detector are usually set to the same frequency band.
Neighbouring loops or loops from neighbouring detectors must be set to different frequency bands.
 2.1 Frequency selection.
7. Head gap –The head gap must be set individually for each classification module. It is usually 400 cm for
TLS 1 loops and 250 cm for TLS 2 loops. We recommend using TLS 2 type loops!
8. Loop length –The loop length of the connected loops must be set for each classification module. The
loop length is usually 250 cm for TLS type 1 loops and 100 cm for TLS type 2 loops.
9. Amplitude factor –The amplitude factor must be set individually for each classification module.
Factory setting of the amplitude factor for TLS type 1 loop is 60 and for TLS type 2 loop 100.
Note: The amplitude factor must be set and checked for every measuring cross section. It is crucial
for the quality of the vehicle classification.
The automatic setting of amplitude factor is described in section 2.3 Classification.
10. Length adjustment – The displayed and actual lengths of a known vehicle must be compared and
adjusted using the length adjustment. The adjustment of the speed and length measurements should be
made with reference to average values obtained from several measuring cycles.
Note: Normally it is not necessary to set this parameter.
11. Speed – The speeds of the vehicles must be measured with a sufficiently accurate measuring method
and compared with the detector measured values. The measured speed can be adjusted to the actual
speed using corrections of the head gap for each classification module.

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4 Display and Operation
4.1 Display elements
The front panel of the detector contains 4 green LEDs for indicating the respective loop state.
LED behaviour in normal operation:
LED
Description
off Loop free
on Loop busy or direction pulse
flashes slowly Frequency calibration running
flashes rapidly Loop fault (break or short)
flashes in pairs automatic evaluation of amplitude factor in process
Chain Synchronisation indicator in 8s rhythm
4.2 (M)ode button
The following functions can be activated by pressing the M-key on the front panel.
M-key
LED display in
binary code
Function
1x short
Uses LEDs 1..4 to display the hardware address set with DIP
switches 1..4.
1x long
Generates a hardware reset
and before that displays the set hardware address
1x short, 1x long Generates a hardware reset
2x short, 1x long
Polls the Master ( ) / Slave ( ) for
Synchronisation
...
6x short, 1x long Resets to factory default settings
The number of short presses of the button is indicated on the LEDs in binary code (left 23, right 20)
For hardware address ‚0’ the flashing sequence / is displayed.
The transition between long and short button depression is indicated after 1s by rapid flashing of all LEDs.
After an additional second the LED indicators go out to indicate the function is activated. If the button is
released sooner, during the flashing phase, the function is cancelled!

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4.3 Factory settings
To restore the factory default parameters, proceed as follows:
1) Press button 6x briefly until shows on the LEDs.
2) Hold button down After one second all LEDs flash rapidly.
After two seconds the LEDs go out.
3) Release button. The essential detector parameters are now set as follows :
Parameter Value Description Comments
Frequency 0 automatic frequency setting depending on device address
Hardware output
Output mode
Inversion
Error output
3
0
0
normal output
not inverting
no loop errors
Standard hardware output for loop
assignment
Loop parameters
Classification module 1
and 2
Head gap
Length adjustment
Amplitude factor
Loop length
250
0
100
100
cm
cm
TLS 2 loop
Output parameters
Classification module 1
Output 1 and 2
Loop assignment
1
2
Output 1: loop 1
Output 2: loop 2
Output 1 and 2
Output function 1 Presence (classification output)
Output parameters
Classification module 2
Output 3 and 4
Loop assignment
3
4
Output 3: loop 3
Output 4: loop 4
Output 3 and 4
Output function 1 Presence (classification output)
Address offset 48 software settable offset Version dependent, if necessary!
RS485 interface
Baud rate
Parity
Parity detection
4
0
1
9600 Baud
even
active
CANopen interface
Baud rate 5 250 kbps
for further details see document
CANopen Object Dictionary
Refer to the RS485 protocol specification for the basic settings of other parameters!

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4.4 Device address
The device address results from the hardware device address set using the DIP switches or DIN connector
and the software settable address offset.
Device address = Hardware device address + Address offset
For downward compatibility to traffic detector VEK S3 the step size for the hardware device address is 2.
Address the first system/module with “device address” and the second system/module with “device
address+1”.
Address setting at DIN connector has higher priority than DIP switches!
4.4.1 Addressing with DIN connector
0: connected to GND
1: not connected (internal Pull-up)
x: don’t care
DIN connector –
Address bit
DIP switch
Hardware-
device address

Device address for
Adr.-Offset 48
4
3
2
1
0
1
2
3
4
(factory setting)
0
0
0
0
0
x
x
x
x
0 *
48
0
0
0
0
1
x
x
x
x
2
50
0
0
0
1
0
x
x
x
x
4
52
0
0
0
1
1
x
x
x
x
6
54
0
0
1
0
0
x
x
x
x
8
56
0
0
1
0
1
x
x
x
x
10
58
0
0
1
1
0
x
x
x
x
12
60
0
0
1
1
1
x
x
x
x
14
62
0
1
0
0
0
x
x
x
x
16
64
0
1
0
0
1
x
x
x
x
18
66
0
1
0
1
0
x
x
x
x
20
68
0
1
0
1
1
x
x
x
x
22
70
0
1
1
0
0
x
x
x
x
24
72
0
1
1
0
1
x
x
x
x
26
74
0
1
1
1
0
x
x
x
x
28
76
0
1
1
1
1
x
x
x
x
30
78
1
0
0
0
0
Not available for
DIP switch addressing!
32
80
1
0
0
0
1
34
82
1
0
0
1
0
36
84
1
0
0
1
1
38
86
1
0
1
0
0
40
88
1
0
1
0
1
42
90
1
0
1
1
0
44
92
1
0
1
1
1
46
94
1
1
0
0
0
48
96
1
1
0
0
1
50
98
1
1
0
1
0
52
100
1
1
0
1
1
54
102
1
1
1
0
0
56
104
1
1
1
0
1
58
106
1
1
1
1
0
60
108
1 1 1 1 1 All address inputs open!
 Only address setting with DIP switches possible!
* Note: Device address 0 is reserved for “No Station“ address. All devices have to answer for requests with
address 0. Therefore device address 0 (hardware device address + address offset) is not allowed!

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4.4.2 Addressing with DIP switch
0: Off
1: On
DIN connector
DIP switch
Hardware
device address

Device address for
Adr.-Offset 48
1
2
3
4
(factory setting)
Only valid, if address pins
on DIN connector are not
connected!
 “1 1 1 1”
0
0
0
0
0 *
48
1
0
0
0
2
50
0
1
0
0
4
52
1
1
0
0
6
54
0
0
1
0
8
56
1
0
1
0
10
58
0
1
1
0
12
60
1
1
1
0
14
62
0
0
0
1
16
64
1
0
0
1
18
66
0
1
0
1
20
68
1
1
0
1
22
70
0
0
1
1
24
72
1
0
1
1
26
74
0
1
1
1
28
76
1
1
1
1
30
78
* Note: Device address 0 is reserved for “No Station“ address. All devices have to answer for requests with
address 0. Therefore device address 0 (hardware device address + address offset) is not allowed!
4.5 DIP switches
The 8-pole DIP switch is used for selecting the device address and for enabling termination for the CAN bus
and RS485 interface. The DIP switches are located on the bottom of printed circuit board. As shipped all DIP
switches are in the OFF position.
DIP-Switch address is only valid, if no address on DIN-connector is coded!
Note!
Before start-up check all DIP switches for the correct position! Improper setting can damage the
interfaces.

Manual VEK S4C
FEIG ELECTRONIC GmbH 11/17 17
4.5.1 RS485 interface bus termination
+5V
GND
470Ω
470Ω
120Ω
120Ω
. . . . . .
RS485 devices
(e.g. VEK S4C)
Typical wiring of the RS485 interface
Bus Low
Bus High
The shown resistors are switchable by the help of the DIP-switches
DIP switch
Description
5 470 Ω-Pull-up resistor on RS485 B+
6 470 Ω-Pull down resistor on RS485 A-
7 Bus termination 120 Ωbetween RS485 B+ and A-
The RS485 bus must be terminated on the front end (control device or repeater) and back end (last detector)
with a 120 Ωresistor. Set DIP switch 7 to ON at the last detector.
In addition the two RS485 signal lines B+ and A- must be connected once to 5V resp. to GND with a 470 Ω
resistor each. If this has not been done on the control device or repeater, the circuit can be activated on the
last detector using DIP switches 5 and 6.
As shipped the DIP switches are in the Off position.
4.5.2 CANopen bus termination
CAN High
120Ω
120Ω
. . . . . .
CANopen devices
(e.g. VEK S4C)
CAN Low
DIP switch
Description
8 Bus termination 120 Ωbetween CAN-High and CAN-Low
The CAN bus must be terminated on the front end (control device or repeater) and back end (last detector)
with a 120 Ωresistor. Set DIP switch 8 to ON at the last detector.

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4.6 Synchronisation display
Correct function of the synchronisation for multiple detectors is indicated by the scrolling effect of the LEDs in
an 8 s rhythm. As the device address increases from left to right, the scrolling LEDs also run from left to right
for all synchronised detectors.
Polling of the Master detector is also possible, as described in 4.2 (M)ode button. The Master sends the
synchronisation signals over the ribbon cable or the DIN connector to the other detectors (Slaves). Selection
is random.

Manual VEK S4C
FEIG ELECTRONIC GmbH 11/17 19
5 Mechanical data
5.1 Dimensions
PCB: 19” plug-in board, 100 x 160 x 19 mm
Total: 125 x 186 X 25 mm,
Front panel 3HE / 5TE
5.2 Board elements

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20 11/17 FEIG ELECTRONIC GmbH
6 Technical data
Supply voltage
12 .. 24 V DC ±20 %
SELV, limited power sources according to EN 62368-1
Power consumption
typ. 900 mW, max. 1,2 W
Dimensions
3HE / 5TE, EURO card, 100 mm x 160 mm
Weight
150 g (250 g with packaging)
Ambient temperature
-20 °C .. +70 °C
Storage temperature
-40 °C .. +85 °C
Humidity
max. 95 % non-condensing
Loop inductance
range
recommended
25 .. 1200 µH
80 .. 300 µH
Working frequency
30 .. 140 kHz
Sensitivity (for 4 channel functions)
0,017 % .. 10,625 % (∆f/f) in 256 steps
Loop cable
length
internal resistance
max. 300 m
max. 25 Ω(incl. cable)
Loop inputs
galvanic isolated (1 kV),
90 V gas tube arresters to PE contact / front panel
Cycle time
8 ms (4 channel)
Loop geometry
Head gap
Length
250 cm and 400 cm
100 cm and 250 cm
Both loops must have identical design and environment!
Speed measurement
Range
Tolerance
Resolution
10 .. 255 km/h (or mph)
<100 km/h, +/-3 km/h (or mph)
>100 km/h, +/-3 % (or mph)
1 km/h (or mph)
Length measurement
Range
Tolerance
Resolution
10 .. 250 dm for constant vehicle speed
+/- 3 dm
1 dm
Vehicle classification 8+1 classes
Car, car with trailer, truck, truck with trailer, van, bus,
motorcycle, articulated vehicle and unclassifiable vehicle