Communications Protocols
6-11
# Start-of-message character
4 Message sequence number
@ ACK (acknowledgment character)
(? returned for a negative acknowledgment)
<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> is 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 Encompass 4 Reader
Reader response
#7Done<crc><eom> or #7Error<eom>
For some commands, the Encompass 4 Reader responds with data that relates to the
command, such as T0F 0, to indicate Wiegand mode enabled for a #532 Display Wie
-
gand Mode Status command.
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