Sensirion RS485 and USB Sensor Cable
SCC1-RS485 and SCC1-USB
Robust RS485 Interface for bus and long
distance communication in demanding
Easy to use USB Interface for laboratory and
Applicable to digital SLQ, SLI and SLG64
liquid flow sensors
The SCC1 sensor cable for Sensirion flow sensors allows the installation and use of I²C based sensors in a demanding
industrial automation environment. In addition to the standard commands available in the I²C interface of the sensor, the
incorporated microcontroller of the cable provides more complex logic such as a dispense volume totalizer, automatic
dispense detection, automatic heater control and data buffer for asynchronous read-out.
Sensirion provides a driver DLL with convenient access functions for use under Microsoft Windows.
2 Pigtail RS485 and USB Versions
The digital SCC1 sensor cable is available in a pigtail variant and in a version with integrated USB plug. The pigtail cable
provides an RS485 interface and needs to be powered by 5 V. The USB cable converts the RS485 to the USB interface and is
directly powered by the USB port of the host PC.
Both variants are connected to the 4-Pin M8 connector of Sensirion’s liquid flow sensors. The interface electronics are molded
into the cable. The SCC1-USB has a total length of about 2 meters, the SCC1-RS485 is available with a total length of 2 m or
Picture: SCC1 sensor cable connected to sensor with pig tail cable (left) and with USB plug (right). Communication interfaces shown in
3 Available Driver DLL
For use under Microsoft Windows®, Sensirion supplies a driver DLL that offers simple C type functions for direct access from
any programming language capable of opening DLLs.
Documentation and sample code for the DLL is available on request
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4 Specifications for the SCC1-RS485 Sensor Cable with Pigtail End
RS485 commands in S-HDLC A configuration software for Windows PC to change the
For use of the cable and sensor with a microcontroller, baud rate and/or RS485 address is available on
the Sensirion-HDLC (high level data link control) request.
protocol is used. See separate documentation for Maximal Number of Devices
SHDCL commands with the RS485 interface. The theoretical maximum of devices that can be
connected on one bus is 255. However, a large number
Pig Tail Pin Assignment of devices on the same bus requires a well-designed
The ends of the pig tail cable can be connected to the network layout. Depending on the chosen data-resolu-
RS485 interface of the master system. The assignment tion/sampling time of the sensor (e.g. 9-bit data values
is as follows: every 1 ms, or 13-bit data values every 10 ms), the bus
Blue Black Brown White bandwidth may limit the number of devices to about 3-5
VDD (5V) RS485 D- RS485 D+ GND devices (9-bit) or 30 or more devices (13-bit and above)
for a bus with 115’200 kbit/s.
Warning: Incorrect connection of the cables can cause
damages to the cable and the sensor. Network Topology
The network has to be designed to suit the application’s
requirements. The recommended network topology for
PC D+ Brown – D+ the RS485 network is a linear, multi-drop configuration
- or - D- Black – D- with short (1-2 m) branch lines to the sensors.
Microcontroller GND White – GND
Blue – VDD
Power Supply GND
Supply Voltage* 5 V (3.5 V - 7 V) Picture: Linear, multi-drop topology with short branch lines
Voltage Stability +/- 0.3 V Termination Resistor
< 10 kHz Termination in RS485 networks is used to avoid signal
Typical Power Consumption 100 mW reflections that cause communication errors. Short
networks with few cables may also work without
Maximal Power Consumption 500 mW termination but with increasing length and number of
*: The minimum supply voltage depends on the sensor sensors the termination of the last sensor of the chain
the cable is used with. should be turned on. Consult the RS485 user’s guide
for more details.
Ground connection It is also possible to terminate the network manually
It is necessary to connect the ground of the sensor with a 120 Ohm resistor.
cable to the ground of the power supply and to the
ground of your system’s RS485 interface. The sensor
cable is not equipped with an opto-coupler or other
electrical isolation between the power supply and the
Baud Rate and RS485 Address
Available baud rates are: 1200, 2400, 4800, 9600,
14400, 19200, 38400, 57600, 115200 baud, with a
default of 115200.
The default address of the SCC1-RS485 cable is 0.
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5 Specifications for the SCC1-USB Sensor Cable with integrated USB plug
PC Driver COM Port and Baud Rate
When plugging in the USB cable, the necessary Virtual The host computer will assign a COM port address to
Com-Port (VCP) driver should be installed auto- the USB cable. The baud rate is 115’200, Echo is Off,
matically. After the driver has been successfully in- RS485 address is 0.
stalled, the device appears in the device manager as If more than one USB cable is connected to the same
USB Serial Port. If this does not happen, please install computer, each USB cable will have its own COM port
the VCP driver from this place: but all cables will have the same RS485 address (0).
6 General Specifications
Operating Temperature* -25 – +85 °C
Storage Temperature -40 – +105 °C
*: Check also sensor specifications for operating temperature of sensor.
Placing of incorporated electronics
The electronics of the sensor cable are housed in the molded bulge of the cable. Because of the power consumption of the
electronics, the cable can heat up minimally at the bulge when in use. To avoid disturbing the flow sensor’s measurement it
is not advised to attach the bulge to the flow sensor housing.
Bending and Forces on Cable
Excessive, repetitive bending of the cable at the connections to the molded bulge may lead to cable breakage. Fasten the
The SCC1 sensor cable is RoHS and WEEE compliant. The combination of the RS485 or USB cable with flow meters from
the digital SLI-series, SLQ-series and SLG64-series is CE certified, see datasheet of specific flow meter.
7 Ordering Information
Please use the following Product Names and Article Numbers when ordering the SCC1 sensor cable.
Product Name Product Article No
SCC1-RS485 2m SCC1-RS485 Sensor Cable (pigtail end), 2 m length 1-100804-01
SCC1-RS485 5m SCC1-RS485 Sensor Cable (pigtail end), 5 m length 1-101122-01
SCC1-USB SCC1-USB Sensor Cable 1-101007-01
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8 Important Notices
FOR THE WARRANTIES EXPRESSLY SET FORTH HEREIN, SENSIRION
8.1 Warning, personal injury MAKES NO WARRANTIES, EITHER EXPRESS OR IMPLIED, WITH
Do not use this product as safety or emergency stop devices or in RESPECT TO THE PRODUCT. ANY AND ALL WARRANTIES, INCLUDING
any other application where failure of the product could result in WITHOUT LIMITATION, WARRANTIES OF MERCHANTABILITY OR
personal injury. Do not use this product for applications other than FITNESS FOR A PARTICULAR PURPOSE, ARE EXPRESSLY EXCLUDED
its intended and authorized use. Before installing, handling, using AND DECLINED.
or servicing this product, please consult the data sheet and SENSIRION is only liable for defects of this product arising under the
application notes. Failure to comply with these instructions could conditions of operation provided for in the data sheet and proper use of the
result in death or serious injury. goods. SENSIRION explicitly disclaims all warranties, express or implied, for
If the Buyer shall purchase or use SENSIRION products for any any period during which the goods are operated or stored not in accordance
unintended or unauthorized application, Buyer shall defend, indemnify with the technical specifications.
and hold harmless SENSIRION and its officers, employees, subsidiaries, SENSIRION does not assume any liability arising out of any application or
affiliates and distributors against all claims, costs, damages and use of any product or circuit and specifically disclaims any and all liability,
expenses, and reasonable attorney fees arising out of, directly or including without limitation consequential or incidental damages. All operating
indirectly, any claim of personal injury or death associated with such parameters, including without limitation recommended parameters, must be
unintended or unauthorized use, even if SENSIRION shall be allegedly validated for each customer’s applications by customer’s technical experts.
negligent with respect to the design or the manufacture of the product. Recommended parameters can and do vary in different applications.
SENSIRION reserves the right, without further notice, (i) to change the
8.2 ESD Precautions product specifications and/or the information in this document and (ii) to
improve reliability, functions and design of this product.
The inherent design of this component causes it to be sensitive to
electrostatic discharge (ESD). To prevent ESD-induced damage and/or Copyright© 2001-2013, SENSIRION.
degradation, take customary and statutory ESD precautions when CMOSens® is a trademark of Sensirion.
handling this product. All rights reserved.
8.3 Warranty 8.4 CE, RoHS, REACH and WEEE Statement
SENSIRION warrants solely to the original purchaser of this product for a The SCC1 series complies with requirements of the following directives and
period of 12 months (one year) from the date of delivery that this product regulations:
shall be of the quality, material and workmanship defined in
SENSIRION’s published specifications of the product. Within such period,
if proven to be defective, SENSIRION shall repair and/or replace this
product, in SENSIRION’s discretion, free of charge to the Buyer, provided The devices fully comply with norm EN 50081-2 (Emission Test
that: Series), EN 50082-2 (Immunity Test Series) and ESD protection.
notice in writing describing the defects shall be given to Directive 2011/65/EU of the European Parliament and of the Council
SENSIRION within fourteen (14) days after their appearance; of 08.06.2011 on the restriction of the use of certain hazardous
such defects shall be found, to SENSIRION’s reasonable substances in electrical and electronic equipment (RoHS); OJ L 174,
satisfaction, to have arisen from SENSIRION’s faulty design, 01.07.2011, p. 88.
material, or workmanship; Regulation 2006/1907/EC of the European Parliament and of the
the defective product shall be returned to SENSIRION’s factory Council of 18.12.2006 on the Registration, Evaluation, Authorisation
at the Buyer’s expense; and and Restriction of Chemicals (REACH); OJ L 396, 30.12.2006, p.1.
the warranty period for any repaired or replaced product shall be EU Directive 2002/96/EC on waste electrical and electronic
limited to the unexpired portion of the original period. equipment (WEEE), OJ13.02.2003; esp. its Article 6 (1) with Annex
This warranty does not apply to any equipment which has not been II.
installed and used within the specifications recommended by
SENSIRION for the intended and proper use of the equipment. EXCEPT
Headquarter and Sales Offices
SENSIRION AG Sensirion Inc., USA Sensirion Korea Co. Ltd.
Laubisruetistr. 50 phone: +1 805 409 4900 phone: +82 31 337 7700~3
CH-8712 Staefa ZH email@example.com firstname.lastname@example.org
Switzerland www.sensirion.com www.sensirion.co.kr
phone: +41 44 306 40 00 Sensirion Japan Co. Ltd. Sensirion China Co. Ltd.
fax: +41 44 306 40 30 phone: +81 3 3444 4940 phone: +86 755 8252 1501
email@example.com firstname.lastname@example.org email@example.com
www.sensirion.com www.sensirion.co.jp www.sensirion.com.cn
Sensirion AG (Germany)
phone: +41 44 927 11 66
www.sensirion.com To find your local representative, please visit www.sensirion.com/contact
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SCC1-RS485 5m SCC1-RS485 2m SCC1-USB 2m