What I want to do is simply replace the means of connecting this apparatus to the AC system i.e. the service checker and the service checker software program installed and running on the laptop. I'm looking at this from a layman's point of view but it occurs to me that I already have the necessary means to control and interrogate the AC system i.e. It's not what I'm after in that, as you say, it does virtually the same job as a service checker but needs installing and setting up on site and is actually even more costly. It seems like a good bit of kit developed by third parties to provide remote access, control and linking of Daikin VRV units to BMS systems, an alternative to Daikin's own and more expensive version.
Here is a link to a sketch on my dropbox of how it normally connects up: Daikin%20Service%20Checker%20-%20Normal%20Connection.pdf Once connected up I can control the system and monitor many different values from it such as temperature sensors, pressure transducers, fan and compressor revolutions and solenoid switches. This comes from two screw terminals on the service checker onto two screw terminals on the main pcb of the air con unit. The service checker is also connected to the air con unit via a simple two core flex. The service checker connects to the laptop with a lead from an RS232 serial port which goes to a usb port on the laptop. The software is on my windows laptop and the service checker acts as the interface between the laptop and the air con unit to be worked on. It is basically a box with a pcb in it and various connection ports and terminals on the outside. The manufacturer of the systems I work on is Daikin and I use a machine called a Daikin Service Checker to do this.
I am an air conditioning engineer and regularly use diagnostic software to look at air con systems and fix problems. I have a connectivity issue I would like to solve and am hoping that this forum about general project advice and feasibility is the right place to ask. I am new to this forum and have no experience as yet with Arduino.
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