Instruction Manual

ACR31 – Reference Manual [e-mail]
Version 1.00
www.acs.com.hk
Page 10 of 19
6.3. SPH_to_RDR_FirmwareVersion
This command is used to retrieve the firmware version string from ACR31.
Offset Field Size Value Description Encrypted
0
bStartByte
1 23h Message start byte.
No
1
wLength
2 0003h
Number of extra bytes starting
from the next field for this
message.
3
bMessageType
1 6Fh
4
wCheckSum
2
CRC16 checksum for all the
preceding fields.
When there is no error, the response to this message is RDR_to_SPH_FirmwareVersion.
Otherwise, the response is RDR_to_SPH_ACK which will specify the corresponding error.