Line scan

What is line scan

Line scan is a command that can be used through the toolbox terminal or in some cases via the device screen. 

This command is relevant for any of these two situations: 

1. We want to tell the device which option to look for in a line type that can support multiple choices, examples are:

   1.1  UMM line type – universal Modbus master that can be used to communicate with any Modbus RTU slave, we need to specify what is the slave device.

   1.2 Haier service HAM line type – need to specify the Haier model such as “MRV5”.

   1.3  LGMV line type – need to specify the LG model such as “MULTIV V”

2. A general line scan:
   Normally the device is getting the information of what units are online and the data changes just “listening” to the traffic on the line with no polling.
   When line scan is activated, the device is doing some polling, and this is brand related:
   
   Daikin – no scan required
   
   ME – scan required when split units only are on line and when service is active on the line , a fix was implemented lately to scan all the time and not only on device startup because we saw that some outdoor units don’t report any data for long time and that causes the units to go offline.
   
   Samsung – may help to find units
   
   Hitachi – may help to find units , required with splits only
   
   Toshiba – may help to find units
   
   Panasonic – may help to find units
   
   LG -  no scan required
   
   Fujitsu – no scan required
   
   Midea – no scan required
   
   GREE - no scan required
   
   MHI - no scan required

How to turn line scan ON through the device' screen

• This option is relevant for situation 2 only - A general line scan

How to turn line scan / special scan ON via the toolbox terminal 

Prerequisites

1. First, download the CoolAutomation ToolBox (if you haven't yet).
2. Then, connect to your device using the USB/IP Network connection.
3. Click 'Connect' and there you will find a terminal screen.  

1.1. UMM line type

Step 1 - Configure L3 line type as UMM :

line type L3 UMM

Step 2 - Set the line type according to the modbus code for the modbus RTU slave you are trying to connect. 

line scan L3 [model code]

A good example for this is connecting a power meter. 

1.2. Haier service HAM line type 

Step 1 - Set L4/5/6/7 line type as HAM :

line type L7 HAM 

Step 2 - Set the line scan according to the Haier model , for example: 

"MRV4-C",

"MRV3-RC",

"MRV-S2",

"MRV5",

"MRV-S"

line scan L7 MRV5

1.3. LGMV line type

Step 1 - Set L4/5/6/7 line type as LGMV :

line type L7 LGMV 

Step 2 - Set the line scan according to the LG model , for example: 

"MultiV IV",     

"MultiV Plus II",

"MultiV III",    

"MultiV III HR", 

"MultiV S Mini", 

"MultiV V"

line scan L7 MultiV V