I am using an Allen Bradley ControlLogix PLC (Logix5561) RSLOGIX5000 version 20.04.
I would like to communicate with a Paroscientific Met4A weather station and store the requested read data in an array in the PLC.
The links to the 2 user manuals are provided here on Paroscientific's website:
http://paroscientific.com/pdf/8819-001_Digiquartz_Operations_Manual_for_RS_485_RS_232_Products_715_Display.pdf
http://paroscientific.com/pdf/8008-001_Manual_for_MET4_and_MET4A_Meteorological_Measurement_Systems.pdf
The Met4A allows for communication on RS232 or RS485. I already have a cable and adapter to communicate over RS232 set up that also powers the Met4A device and has a 9 pin connector (DB9)
Based on what I have read from the manual. It looks like this is serial communication using ASCII Serial Protocol. Is this the same as Modbus ASCII protocol? The commands and responses are different than how I understand doing modbus comms using Modbus RTU.
Example from the Manual on how to read a parametr's value of a tag named UN:
Command:
*0100UNCrLf
Response:
*0001UN=1CrLf
Is it possible to communicate with this using Prosoft's Modbus Module? Currently I have a Prosoft MVI56-MCM module for Serial Modbus RS232/RS422/RS485.
I am just unsure about the mapping and how I go about requesting to read the data.
I am novice at modbus comms, but I have gotten Modbus RTU comms to work using modbus RTU in RSLOGIX and the Prosoft AddOn import logic for talking with other hardware. But I am not as familiar with ASCII and whether this can be done with my PLC and Prosoft module.
Or do I need additional hardware?
At the end of the day I want to get this Met4A data into my PLC and I don't really care how. My company can buy another module or other hardware to read it in if I can prove it works.
Thanks in advance.
I would like to communicate with a Paroscientific Met4A weather station and store the requested read data in an array in the PLC.
The links to the 2 user manuals are provided here on Paroscientific's website:
http://paroscientific.com/pdf/8819-001_Digiquartz_Operations_Manual_for_RS_485_RS_232_Products_715_Display.pdf
http://paroscientific.com/pdf/8008-001_Manual_for_MET4_and_MET4A_Meteorological_Measurement_Systems.pdf
The Met4A allows for communication on RS232 or RS485. I already have a cable and adapter to communicate over RS232 set up that also powers the Met4A device and has a 9 pin connector (DB9)
Based on what I have read from the manual. It looks like this is serial communication using ASCII Serial Protocol. Is this the same as Modbus ASCII protocol? The commands and responses are different than how I understand doing modbus comms using Modbus RTU.
Example from the Manual on how to read a parametr's value of a tag named UN:
Command:
*0100UNCrLf
Response:
*0001UN=1CrLf
Is it possible to communicate with this using Prosoft's Modbus Module? Currently I have a Prosoft MVI56-MCM module for Serial Modbus RS232/RS422/RS485.
I am just unsure about the mapping and how I go about requesting to read the data.
I am novice at modbus comms, but I have gotten Modbus RTU comms to work using modbus RTU in RSLOGIX and the Prosoft AddOn import logic for talking with other hardware. But I am not as familiar with ASCII and whether this can be done with my PLC and Prosoft module.
Or do I need additional hardware?
At the end of the day I want to get this Met4A data into my PLC and I don't really care how. My company can buy another module or other hardware to read it in if I can prove it works.
Thanks in advance.