TransCore 0596465PT90 用户手册
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.
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.
command, such as T0F 0, to indicate Wiegand mode enabled for a #532 Display Wie-
gand Mode Status command.