MPRX
TransCore Proprietary
6–9
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 MPRX
Reader response
#7Done<crc><eom> or #7Error<eom>
For some commands, the MPRX responds with data that relates to the command, such
as T0F 0, to indicate the mode enabled for a #570 Display Operating Mode Status
command.
#7Error<eom>
will be returned if host transmission is not a legal command with legal
data.
Timing and Synchronization
The ECP is largely independent of baud rate. The timeout delays previously described are
a function of baud rate.
The MPRX supports an ECP timeout, which applies equally to both transmit and receive.
The receiver’s minimum timeout delay equals the time to transmit/receive the longest
anticipated message at the current baud rate setting. Additional margin should be included
for idle periods between characters; for example, processing overhead, if any. The timeout
delay period can be expressed as follows:
Τ
rec
(ms) = L x [
Τ
char
+
Τ
idle
]
Содержание MPRX
Страница 19: ...Chapter 1 Introduction...
Страница 23: ...MPRX TransCore Proprietary 1 5...
Страница 24: ...Chapter 2 Developing the Site Plan...
Страница 37: ...Choosing Installing and Removing Tags Chapter 3...
Страница 48: ...Installing the MPRX Chapter 4...
Страница 64: ...MPRX TransCore Proprietary 4 17...
Страница 65: ...General Software Information 5...
Страница 70: ...System Guide TransCore Proprietary 5 6...
Страница 71: ...Communication Protocols Chapter 6...
Страница 87: ...MPRX TransCore Proprietary 6 17...
Страница 88: ...Chapter 7 Commands...
Страница 127: ...Chapter 8 Configuring the MPRX...
Страница 146: ...Chapter 9 Troubleshooting and Maintenance...
Страница 152: ...System Guide TransCore Proprietary 9 6...
Страница 153: ...Chapter 10 Interface to Train Recording Unit...
Страница 158: ...Chapter 11 Check Tag to MPRX Assembly...
Страница 164: ...MPRX TransCore Proprietary 11 7...
Страница 165: ...Appendix A Glossary...
Страница 171: ...MPRX TransCore Proprietary A 7...
Страница 172: ...Technical Specifications Appendix B...
Страница 175: ...Wiring Diagram C...
Страница 179: ...Command Quick Reference Appendix D...
Страница 203: ...MPRX TransCore Proprietary D 25...
Страница 204: ...Compatible Tag Information E...
Страница 208: ...MPRX TransCore Proprietary E 5...