Vacon 100 HVAC, User Manual

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6
vacon • 40 Communications
Tel. +358 (0) 201 2121 • Fax +358 (0)201 212 205
Message frame:
The reply to Preset Multiple Registers message is the echo of 6 first bytes.
Answer Slave - Master:
Reply frame:
Example 2:
In this example the actual speed and the first Process Data OUT variable of the drive is read. The
Process Data OUT registers 2103 and 2104 are read to achieve this. The Modbus function used to
read the values is 4 (Read Input Registers).
Read the Process Data 42103…42104 with command 4 (Read Input Registers).
Command Master - Slave:
Table 38.
01 10 07 D0 00 03 06 00 01 00 00 13 88 C8 CB
Table 39.
ADDRESS 01 hex Slave address 1 hex (= 1)
FUNCTION 10 hex Function 10 hex (= 16)
DATA Starting address HI 07 hex Starting address 07D0 hex (= 2000)
Starting address LO D0 hex
No. of registers HI 00 hex Number of registers 0003 hex (= 3)
No. of registers LO 03 hex
ERROR CRC HI 80 hex CRC 8085 hex (= 32901)
CHECK CRC LO 85 hex
Table 40.
01 10 07 D0 00 03 80 85
Table 41.
ADDRESS 01 hex Slave address 1 hex (= 1)
FUNCTION 04 hex Function 4 hex (= 4)
DATA Starting address HI 08 hex
Starting address LO 36 hex
No. of registers HI 00 hex Number of registers 0002 hex (= 2)
No. of registers LO 02 hex
ERROR CRC HI 93 hex CRC field 93A5 hex (= 37797)
CHECK CRC LO A5 hex