ADLINK PXES-2590 - Manual (Page 52)

42 Monitoring/Control Functions
*Read Fan Speed 1 (command 0x20)
Reads the Fan Speed 1 Reading.
Use the SMB 1 Send Byte and 2 Receive Byte to Read this
word data:
Data format is as follows:
*Read Fan Speed 2 (command 0x22)
Reads the Fan Speed 2 Reading.
Use the SMB 1 Send Byte and 2 Receive Byte to Read this
word data:
Data format is as follows:
SMB Dir Offset Value Description
Send Byte > 0 SA Slave address
> 1 0x20 Command code
Receive Byte > 2 SA Slave address
< 3 0-255 Low byte data
Receive Byte > 4 SA Slave address
< 5 0-255 High byte data
Bit Description
15..0 Fan 1 Speed. Unsigned 16-bit data, the LSB is 1 rpm
SMB Dir Offset Value Description
Send Byte > 0 SA Slave address
> 1 0x22 Command code
Receive Byte > 2 SA Slave address
< 3 0-255 Low byte data
Receive Byte > 4 SA Slave address
< 5 0-255 High byte data
Bit Description
15..0 Fan 2 Speed. Unsigned 16-bit data, the LSB is 1 rpm