where
#
Start-of-message character
4
Message sequence number
KING 1302 Message data: Tag ID is shown.
Other sample message data could be as follows:
IOST C0 O2 I0 D24 (display I/O status) #Error06 (frequency not set)
<crc> CRC value for the message
<eom> End-of-message character
Host response
#4@<crc><eom>
where
# Start-of-message character
4 Message sequence number
@ ACK (acknowledgment character)
? NAK (negative acknowledgment character)
<crc> CRC value for the message
<eom> End-of-message character
Host Command Transmissions
Basic protocol host transmission
#647XXX<eom>
Reader response
#Done<eom> or #Error<eom>
#Error<eom> returned if the host transmission is not a legal command with legal data.
ECP host transmission
#7647XXX<crc><eom>
where
# Start-of-message character
7 Message sequence number
647XXX Select RF Operating Frequency command where 647XXX is the command and XXX is
a hexadecimal value from 000 to 118. In this example, XXX sets the RF frequency to 903
MHz.
<crc> CRC value for the message
<eom> End-of-message character
#Done Command has been invoked by the MPRX
MPRX User Guide
TransCore Proprietary
4–48
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