Learn how to quickly set up and configure your MemoRail Modbus transmitter for pH, ORP, conductivity, and oxygen sensors.

What You Need

To configure your MemoRail Modbus transmitter, you will need an RS-485 to USB adapter, a laptop preloaded with a DTM framework such as PACTware, MemoRial Modbus DTM, a power supply, and of course your MemoRail Modbus transmitter.

Overview

MemoRail Modbus is a 4-wire device powered by 24 volts DC here at terminals 1.1 and 1.2. The version we are configuring today is a 2 channel version capable of bringing in any combination of Memosens pH, ORP, conductivity, or oxygen sensors. This transmitter is also capable of taking in the Knick SE 740 optical oxygen sensor. Sensor connections are established at the bottom of the housing through terminals 4.1 to 6.4. Terminals 3.1 through 3.4 are for our Modbus RTU connection.

In this video we’ll be configuring our MemoRail locally via the DIP switches on the front of the device as well as via Modbus through the devices DTM. A pin out printed on the side of the housing indicates the assignment of the eight DIP switches. MemoRail Modbus acts as a slave device, meaning information must be requested from the device via a Modbus master. You can connect up to 32 MemoRails to one Modbus master allowing for up to 64 measurements.

DIP Switches

To address our MemoRail Modbus transmitter we will utilize DIP switches 1 through 5. The addressing follows simple binary format, and you can set it anywhere between 1 and 31. Next with DIP switches 6 & 7, we can set our data formatting. The default for this setting is 1 start bit, 8 data bits, even parity, and 1 stop bit. Finally with DIP switch number 8, we can activate the second channel on our MemoRail Modbus transmitter. We will ensure this DIP switch is on, and apply power to the device.

Device Type Manager

We’ll now finalize configuration through the DTM by utilizing our RS-485 to USB adapter. For simple configuration of the device and connected sensors, use the device type manager. The DTM allows for easy communication with our MemoRail to read and write registers. Of course, any Modbus master software can be used for configuration with the proper read and write registers. These can be found within our Command Specification file located on our website.

On the main screen of the DTM, you can see the different tabs which we have available for configuration. Under the MemoRail tab, we can write our baud rate which comes as a factory default of 19,200 as well as our Modbus byte order. Further, under each measurement parameter tab we can easily read and write our Modbus registers specific to our connected sensor.

Final Steps

Once we finalize the setup of our transmitter, we will begin reading our measured value registers to ensure we are not receiving any channel errors. This completes the setup and configuration of our MemoRail Modbus transmitters. We’re now ready to go online with our measurements. Watch our next videos on calibrating and troubleshooting with the Knick MemoRail Modbus transmitter.

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