Sierra Wireless DART 200 CDPD Modem - Manual (Page 65)

DART 200 CDPD Modem User’s Guide 5 DART Supported Protocols
PN1197-00 Revision 1.0 5-11
Sample UDP server setups
These settings give a general sense of the AT commands required to set
up a DART 200 for a UDP application. All relevant AT commands are
listed, including the defaults. All devices function differently, so the
setups that follow are general. These setups show specific items to
examine, but it is good practice to examine all of the setup values.
Two UDP setup examples are given:
• Remote UDP setup - A remote telemetry application and a central
client application, that shows the setup for a server modem at an
RTU being polled by a host computer
• Host UDP setup - shows the setup for a client modem at the host
computer that does the polling. This modem at the host arrangement
is suitable for bench-testing and limited use pilot implementations.
Production systems normally are direct connected through a leased
line or frame relay to a router at the customer’s host system (F-ES)
Remote UDP setup
The remote modem is set up as a server at the remote telemetry unit
where it responds to polls from a host computer. The sample RTU does
not use flow control and the data being sent is binary, not character, data.
This requires the UDP server to be set up with auto answer to respond to
polling, no flow control, and timed data forwarding because of the binary
data.
In Table 5-1, line items marked with an R (required) or an O (optional)
were changed from the default (D). After the changes are made save
them with an AT&W.
Table 5-1. Remote UDP setup
AT Command Req Opt Def Description
AT^Annn.nnn.nnn.nnn R Input IP Address (if not already done)
AT\N[1,2] R Side Preference (get from carrier)
AT\J0 D Use default - No channel access
restrictions
AT\R4 R Auto Registration at Power On
ATS13=0 R With AT\R4 sets Continuous
Automatic Registration
AT\O0 R PAD mode required for UDP.
AT*A2 R Set UDP Server mode
AT*L2100 D Use default - Listen on port 2100
ATS0=1 O Activate auto answer for server
ATS82=0 R Turn off backward compatibility.
Consider friends only mode if
unauthorized access is a concern.