Tag Archive: modbus

We Supply Custom Modbus Data Logging Systems

CAS DataLoggers Offers Simple and Robust Monitoring Solutions
CHESTERLAND OH—July 14, 2014

Can’t find a data logging system that meets your I/O requirements? Do you need a distributed system to monitor multiple points spread across a factory floor or several buildings? At CAS DataLoggers we can custom-configure a monitoring system for your application using Modbus-based devices. Just give us a call at 1-800-956-4437 and we can help you select the best datalogger for your project. Read more about these flexible and robust data logging systems on our new Press Release page.

CAS Provides Affordable Data Acquisition and Recording

Novus FieldLogger RTU 8-Channel Data Logger
CHESTERLAND OH—January 9, 2012

CAS DataLoggers has teamed with Novus Automation to provide customers with the newest solution for flexible, affordable data acquisition and supervision. The bestselling Novus FieldLogger RTU 8-Channel Universal Input Data Logger is a microprocessor-based data acquisition and recorder designed to handle any analog input and operates either as an RTU linked to a PC for online recording and supervision, or as a stand-alone data logger with real-time clock and graph capabilities. This low-cost logger is widely used as a Modbus RTU input device as part of a SCADA system to transmit channel data using Modbus protocol. With 8 universal channels accepting different input sensors simultaneously, these high-speed industrial dataloggers have lots of available memory and many connectivity options along with expansion modules and wireless communication accessories.

The datalogger is DIN rail compatible and includes a 35mm rail mounting in an ABS enclosure. Configuration is retained on the logger in non-volatile memory, and configuration and data retrieval are managed using a PC along with the included configuration utility software. The Novus FieldLogger also features an RS485 interface allowing communication up to 1.6 miles (1 Km). For users without a RS485 port on their PC, Novus also manufactures an easy-to-use USB-RS485/RS422 converter, transforming an ordinary USB port into a fully-functional RS485 interface.

The Novus FieldLogger features 8 universal analog inputs supporting several types of thermocouples as well as Pt100, mA, mV and higher voltages by applying external resistor dividers. The logger is also capable of performing mathematical operations in the input channels. Additionally, the FieldLogger has one digital input for remote start/stop and 2 alarm relay channels which can be activated when any channel enters a programmed alarm condition; these relays can also be used as digital outputs. The logger also provides internal cold junction compensation for thermocouples, enabling high-accuracy measurements. Recording at a working temperature of 32 to 130°F (0 to 55°C), the new datalogger also features an internal resolution of 20000 counts, linearity of better than 0.05% of FS, and can scan 8 channels in 0.5s.

FREE FieldChart configuration utility software is included and is downloadable from the manufacturer website. FieldChart is a Windows compatible software which performs the communication and data treatment for the FieldLogger recorder and Novus controllers with RS485. This easy-to-use intuitive system saves users the hassle of previous training. The main module collects data to the PC, displays the data in both digital and graphic formats in batches or in real time, and provides trend and historical views. It can zoom in and out, superimpose or link graphs in one screen, print graphs or lists, and export to spreadsheets or word processors. The practical configurator module performs the setup of the FieldLogger parameters and also allows users to check general status. In addition to its standard use as a Modbus RTU, for online reading and recording (history), the included Microsoft Windows FieldChart software also reads and records a graph for a 10-minute period. Users needing more in-depth data analysis can upgrade to the full FieldChart analysis software to allow the Field Logger to form a complete data acquisition system.

With the power and versatility to handle analog and digital signals at high resolution and speed, the Novus FieldLogger is a cost-effective solution for customers’ data acquisition and temperature recording needs. Check out the Novus Fieldlogger product page here.

For further information on the Novus FieldLogger RTU 8-channel Universal Input Data Logger, other Novus dataloggers, or to find the ideal solution for your application-specific needs, contact a CAS Data Logger Applications Specialist at (800) 956-4437 or visit the website at www.DataLoggerInc.com.

Contact Information:
CAS DataLoggers, Inc.
12628 Chillicothe Road
Chesterland, Ohio 44026
(440) 729-2570
(800) 956-4437
sales@dataloggerinc.com
http://www.dataloggerinc.com

CAS DataLoggers Introduces New Wireless Gateway Using Modbus

New Novus Wireless AirGate Modbus Gateway

CHESTERLAND OH—November 3, 2011

CAS DataLoggers has partnered with Novus Automation to introduce the new Wireless AirGate-Modbus Gateway, a wireless multifunctional gateway that allows the transparent and easy insertion of wireless branches into existing wired RS485 networks. The AirGate-Modbus has four operation modes: Modbus Master, multiplexer, USBRS485 converter and simple wireless RS485 extension. A proprietary protocol based on IEEE 802.15.4 facilitates operation in Star mode, enabling the connection of several wireless segments to an existing Modbus RS-485 network. With the new Novus gateway’s many features, users gain quick integration of their wireless technology at a low cost.

The Novus AirGate offers up to 16 operating channels and a maximum transmission power of 100 mW. Bright LEDs give users clear status indication. Operating on a 10 to 35 Vdc power supply, the gateway can achieve an RF data rate of up to 250 Kbps and a serial port baud rate of 1200 to 115.2 Kbps. Using an operating band of ISM 2.4 Ghz and an antenna gain of 2 dBi, the AirGate’s wireless range extends out to 328 ft. (100m) indoors and 3280 ft. (1000m) outdoors. The Novus gateway uses a network identifier (PAN ID) for transparency and runs at a broad operating temperature of 0 to 70°C (32°F-158°F). The AirGate is a low-power solution with a power consumption of only 70 mA (@ 24 Vdc).

Also included are an RP SMA female connector plug and two RS485 connectors for Modbus RTU interface. Data collection is a snap with the gateway’s Mini-B USB device. Additionally, the gateway’s wireless capability is backed by strong security, utilizing powerful AES-CBC-128 Data cryptography (Advanced Encryption Standard).

CAS DataLoggers is offering the new Novus logger at an ideal price point for users who want all its essential features without breaking their budgets. This hassle-free device gives users a single solution for solving the problem of how to incorporate new wireless technology into their existing wired networks.

Additional wireless dataloggers in inventory can be found here.

For further information on the Novus Wireless AirGate Modbus Gateway, other wireless gateway devices and dataloggers, or to find the ideal solution for your application-specific needs, contact a CAS Data Logger Applications Specialist at (800) 956-4437 or visit the website at www.DataLoggerInc.com.

Contact Information:
CAS DataLoggers, Inc.
12628 Chillicothe Road
Chesterland, Ohio 44026
(440) 729-2570
(800) 956-4437
sales@dataloggerinc.com
http://www.dataloggerinc.com

Configuring DT8x Data Loggers to Interface with Maple Displays via Modbus

Modbus Data Loggers Assist with Multiple Devices in the Field and Onsite

CHESTERLAND OH—August 3, 2011

Customers occasionally need to perform the task of interfacing their data loggers with the popular line of Maple displays, whether viewing their data on the plant floor or out in the field. Following is a quick tutorial on configuring the bestselling dataTaker DT8x series data loggers to interface with Maple displays using Modbus.

First configure the Modbus interface on the data logger. Users have several options here: the logger can be configured as a Modbus Master in which case all data must be explicitly written to or read from the display by the data logger. If more than one display will be used, for example, a local display by the logger and a remote display for an operator, the logger should be configured as a master to allow it write to multiple devices. If there’s just one display, it’s possible to set the display as the master and logger as the slave, which simplifies the programming on the logger side.

Once the choice of making the logger a master or slave device has been made, the next step is to configure the hardware interface of the data logger, as the DT82I, DT80 and DT85 models support Modbus communication via either the serial sensor port on the front of the logger (1Serial) which allows RS-232, RS-485 or RS-422 communications or the host serial port on the side of the logger (2Serial) which is RS-232 only. When using the front serial port, a custom cable will need to be built; in the case of RS-485 communications the Tx terminal is the Data- and the RTS terminal is the Data+. If the host port is used, a standard dataTaker IBM-6 cable can be used to connect to a display that uses the standard 9 pin wiring configuration (pins 2,3 and 5). Following the instructions in the manual in the section for the Modbus interface, the appropriate PROFILE settings will be need to made in the logger for the serial port being used. These include: Baud Rate, Parity, Databits, Stopbits, Flow, Function (MODBUS or MODBUS_MASTER), Mode (for RS232/422/485 on the serial sensor port only) and MODBUS_SERVER for the appropriate port to set the bus address of the logger.

After the data logger has been configured using one of the above options, the final configuration step is to set-up the Maple display. Like the logger, the display can be configured as a Modbus Master or Slave device. The display will normally be configured as the opposite of the logger, but there can only be one master on the bus. If there is more than one display, the most common configuration is to set them all to be Slaves. If there is only one display, it can be set to be a Master if the logger is set as a Slave. If the display is set to Master, the display will be configured to use the Mobus RTU master driver. To do this, in the EasyBuilder 5000 software, go to Edit -> System Parameter Settings -> Device Properties, create a new device and set the PLC type to Modbus Master. If the display is set to Slave, use Mobus RTU slave driver. In the EasyBuilder 5000 software, go to Edit -> System Parameter Settings -> Device Properties, create a new device and set the PLC type to Modbus RTU/TCP Slave. Now configure the other parameters to match the logger communications settings: Baud rate, parity, data bits, stop bits, flow, and PLC I/F type. If the display is a slave, the Station # in the configuration screen is the Modbus Address of the display, so this needs to be set appropriately as it will be the address that users write to from the data logger.

To exchange data with the Display, proceed according to whether the display has just been set as a Master or Slave. If the Display Is a Master, this is the simplest configuration: in this case, the logger simply writes the data to a CV which it automatically maps to a Modus register. For example, 1CV is read from the display at register 30001 or from a read/write at register 40001. The default format is as a signed integer, but the loggers SETMODBUS command can be used to change the format of the data for a CV or group of CVs to unsigned integers or floats. Be aware that in the case of floats, the data is stored across 2 Modbus registers. If the Display Is a Slave, then to display data, the data logger has to explicitly write the data to the display using the nMODBUS(ADm, Rx:y)=zCV command where: n is 1 for the serial sensor port of the logger and 2 for the host port; m is the address of the display (set as the station # above); x is the register set = 4 for read/write; and y is the register number. Also note that the register number configured on the display is 1 less than the register number written to from the logger, i.e. the logger writes to 40001 and the data appears on the display in LW 0; and z is the number of the CV holding the value to be written.

When Reading data, use the command nModbus(ADm,, Rx:y, =nCV). The parameters are the same as above, except that x can be 3 for read-only registers. Again, the standard data type is a signed integer, but the logger supports other formats via the MBx modifier in the write command. As before, be aware that 32-bit values will span 2 registers. When writing ASCII data, text data can be written as the equivalent decimal value. To send 1, send 49(the ASCII decimal value of 1).

Check out the DT8x family of data loggers here at our dataTaker product page.

For further information on the bestselling dataTaker line of DT8x data loggers, other data loggers supporting Modbus, or additional technical questions on any application-specific solution, contact a CAS Data Logger Applications Analyst at (800) 956-4437 or visit the website at www.DataLoggerInc.com.

Contact Information:
CAS DataLoggers, Inc.
12628 Chillicothe Road
Chesterland, Ohio 44026
(440) 729-2570
(800) 956-4437
sales@dataloggerinc.com