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2022.02
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4.2.3 Method 2) Update with a USB/RS485 converter.
Instructions:
1. Make sure that the Modbus Interface DIII is powered off.
2. Disconnect all existing Modbus RS485 A+/B- connections and connect the USB/RS485 converter to X3M (see
figure).
3. Set dipswitch DS1 & DS2 as indicated in the figure.
4. Power on the Modbus Interface DIII.
5. Start the updater on the PC.
6. Proceed to the Setting menu and make sure the correct USB serial COM port is selected (e.g. COM4).
7. Proceed to the "Update Procedure Selection" window. The ID of the existing software is automatically
detected.
“Rx+/Tx+”
=>
“A+”
“Rx
-/Tx-
“
=>
“B
-
“
DS1 off/off/off/off setting
DS2 is
not
off/off/off/off (e.g. DS2 is off/off/off/on)
USB/RS485 converter (Daikin spare - part reference 999417P)