Sierra Wireless DART 200 CDPD Modem User Manual
Page 59
DART 200 CDPD Modem User’s Guide
5 DART Supported Protocols
PN1197-00 Revision 1.0
5-5
To set up the options, first, review Chapter 8, Application Programming,
and the command descriptions in Appendix F, DART AT Command Set
before setting the following parameters, then proceed to step 1.
•
Command mode echo (En)
•
Data set ready (DSR) operation (&Sn)
•
Verbose Mode (Vn)
•
Data Forwarding operation (\Fn)
•
Quiet mode (Qn)
•
Manual transmit control (\Mn)
•
Online mode echo (Fn)
•
Flow control (\Qn)
•
Extended result codes (Xn)
•
Automatic transmit control (\Tn)
•
Data carrier detect (DCD) operation (&Cn)
•
Reception of IP broadcasts (*Bn)
•
Data terminal ready (DTR) operation (&Dn)
•
Listening Port (*Ln)
•
Escape code recognition (&En)
1. Set the key parameter, PAD operating mode (\On), to \O0
for UDP
operation. The default value is \O1, so it must be changed.
2. UDP is the only CDPD protocol that can receive broadcast messages.
Use the AT*Bn command to allow (B1) or to suppress (B0)
reception of broadcast traffic.
3. Check with your carrier to determine if multicast is available in your
area before proceeding to step 4.
4. Direct multicast messages to the modem’s listening port (refer to *L
command in Appendix F, DART AT Command Set). Multicast
messages can appear at any time; possibly interspersed with the
application data. The end-user’s application must handle the
multicast messages interspersed with the application data. For
applications with the modem set up to use multicast, be aware that it
cannot be suppressed by AT commands.
UDP server characteristics
The DART UDP server is a backward compatible extension to the
DART 200 basic UDP implementation with the following additional
features:
•
Auto-answer capability to permit Remote Terminal Units (RTUs)
with limited capability to use UDP. The RTU is not required to issue
a UDP dial (ATDP) command in order to receive messages when the
UDP server is active
•
Friends Only mode to restrict communications to a specific list
(maximum of 10) of source addresses (IP Address only). This helps
prevent unauthorized access to the MAS application
?
?
NOTE:
At present no carrier is
offering a broadcast
capability.
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NOTE:
UDP is also the only
protocol that can
receive multicast
messages.