See what’s included when you unbox your MemoRail Modbus, and get an overview of its terminal blocks, indicator lights, and setup DIP switches.

MemoRail Modbus Overview

Let’s review the compact DIN rail mounted MemoRail Modbus transmitter by Knick. The dual channel version of this transmitter allows us to bring in two Memosens pH, ORP, conductivity, or oxygen sensors. As an added bonus, you can also bring the Knick SE 740 optical oxygen sensor into the MemoRail Modbus transmitter.

Communication with the device is provided via the Modbus RTU protocol, with all read and write registers available to the end user. You can find these registers in the Modbus Command Specification file which is available for download on our website. Along with the main measurement variables transmitted via the protocol, we also have access to the Memosens sensor diagnostics, as well as the ability to calibrate through Modbus.

Inside the box you will find, of course, your MemoRail Modbus transmitter. As well as the manual, which provides detailed specifications as well as a wiring diagram.

Terminals

Let’s review the terminals on the top and bottom of the transmitter. MemoRail Modbus is a four-wire device and can be powered via 24 volts DC, directly at terminals 1.1 and 1.2. These are located along the top of the transmitter or by a DIN rail BUS connector, and you can purchase them separately. Next are the Modbus RTU terminals connecting at 3.1 through 3.4.

The terminals to wire your Memosens sensor are located at the bottom of the transmitter. Let’s review the terminals for the first sensor connection. Terminal 4.1 is for the brown Memosens wire. 4.2 green wire. 4.3 yellow wire. And 4.4 the white wire. Terminals 5.3 and 5.4 are for the shield or clear wire for your Memosens sensor. For ease of wiring, you can easily remove the terminal block.

The DIP switches on the front of this device serve to set the data format as well as the address of the device which acts is a Modbus slave. It’s important to note that you can connect up to 32 MemoRail Modbus transmitters to one Modbus master. That means up to 64 measurements! Printed on the side of the transmitter and in the manual, you’ll see the available options for addressing the device and setting the data format.

LED Indicators

Lastly, there are a convenient set of LED lights located on the front of the transmitter indicating the status of your measurement loop as well as the Modbus communication. A solid green light indicates that all is well. A solid red light indicates that there’s a device error. A flashing red light indicates that there’s a sensor error or communication fault. Lastly, a blinking red light indicates that there’s a sensor parameter error.

The MemoRail Modbus compact digital transmitter provides seamless integration into OEM systems as well as areas of installation where with limited space. Check out our additional videos on the MemoRail Modbus and familiarize yourself further on setup, configuration, calibration, and troubleshooting the device.

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