List Of Register Addresses - Panasonic FV-SWGR1 Installation And Operating Instructions Manual

Remote control for energy recovery ventilator (erv)

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RS485 CONNECTION SETTINGS

Communication frame structure

Name

Number of bytes

Default interval

Start: Set a default range of 3.65 ms or more between signals (without communication time).

Machine address: Specify a machine address to connect the RS485 module. (Refer to "List of the machine

addresses" for the setting method.)

Function code:

Data: The composition of the data section varies with the function code and register address.

(Refer to "Cases of Setting Communication Framework".)

Check code: The calculated value of a 16-bit CRC in the Modbus-RTU mode.

·For CRC calculation, refer to below:

1. Preset a 16-bit register as 0FFFFH (all 1s), which is called a CRC register.

2. Perform an exclusive-or (XOR) operation between the 8 bits of the first byte in the data

frame and the low byte in the CRC register, and store the result back to the CRC register.

3. Shift the CRC register one bit to the right, put a 0 in the most significant bit, shift out the

least significant bit, and perform a detection.

4. If the least significant bit is 0: repeat Step 3 (for the next bit shift); if the least significant

bit is1: perform an exclusive-or (XOR) operation between the CRC register and the preset

fixed value (0A001H).

5. Repeat Steps 3 and 4 until 8 bit shifts are performed. This completes the bit manipulation

of an 8-bit byte.

6. Repeat Steps 2 through 5 to manipulate the next 8 bits until all byte manipulations are

complete.

7. The final value of the CRC register is the CRC value.

End: Set a default range of over 3.65 ms between signals (without communication time).