AI1422E Reader
TransCore Proprietary
7-3
Communications can be lost if the host computer attempts to send certain commands
under marginal communications conditions. For example, if the host computer transmits the
command request to change the baud rate and the AI1422E Reader properly receives the
request and transmits the
Done
message, one of the two following conditions may occur:
•
If the host computer receives the
Done
message, then both the host and the AI1422E
Reader switch to the new baud rate, and communications are maintained.
Note: In many applications, the host must be set to the new baud rate as it will not
change automatically.
Note: The AI1422E Reader changes the baud rate immediately after issuing the
Done
message.
•
However, if the host does not receive the
Done
message transmitted by the AI1422E
Reader, the host assumes that the command was not properly sent and does not switch
to the new baud rate, causing a loss of communications.
Caution
The host computer should not attempt to change communications parameters
or protocols during marginal communications conditions; otherwise, a loss of
communications can result.
Download Mode
In download mode, the AI1422E Reader allows the host to download new software.
While in download mode, the reader communications port parameters are fixed at the
following factory-default settings: 38400 baud, 8 data bits, 1 stop bit, no parity, software
flow control (XON/XOFF), basic protocol.
While in download mode, the AI1422E Reader turns RF off, does not process tags, and
does not echo host commands.
Command List
Reader commands are divided into groups based on primary function. The following
sections provide information about each command in command number order. Refer to
Appendix D for listings of commands in numerical and alphabetical order.
In the following text, the symbols < and > represent variable message data. These symbols
are not part of the message syntax.
Hex digits (0–9, A–F) in either uppercase or lowercase characters may be used in data
strings and for hex digits A–F.
Summary of Contents for 1422E
Page 16: ...Before You Begin 1...
Page 20: ...AI1422E Reader TransCore Proprietary 1 5...
Page 21: ...2 System Overview...
Page 25: ...AI1422E Reader TransCore Proprietary 2 5 Figure 2 2 Antenna to Tag Centerline Tolerance...
Page 26: ......
Page 27: ...3 Interface Connections...
Page 32: ...User Guide TransCore Proprietary 3 6...
Page 33: ...4 Installation Instructions...
Page 41: ...AI1422E Reader TransCore Proprietary 4 9...
Page 42: ...5 System Test Procedures...
Page 45: ......
Page 46: ...6 Communications Protocols...
Page 49: ......
Page 50: ...7 Command Codes...
Page 87: ...User Guide TransCore Proprietary 7 38...
Page 88: ...8 Troubleshooting and Maintenance...
Page 93: ......
Page 94: ...Character Conversion A...
Page 96: ...B Technical Specifications...
Page 99: ......