ACS ACR31 Swipe Card Reader - Manual (Page 10)

ACR31 – Reference Manual [email protected]
Version 1.00
www.acs.com.hk
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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.