Sierra Wireless RAVEN 1X 20070914 - Manual (Page 66)

Data Communication and Host Modes
Rev 3.0B Feb.08 61
SLIP
SLIP mode is entered be using the “AT\ASLIP” command. As
in PPP Mode, the IP address that the host assumes is affected
by the setting of *HOSTPRIVMODE. SLIP does not negotiate
the IP address with the connected device or computer, so
before making a SLIP connection, the SLIP driver on that
device or computer must be configured to use the IP address
specified by querying S110.
UDP and UDP Pad
When the modem is in UDP PAD (Packet Assembly and Disas‐
sembly) Mode, all characters received on the serial port are
assembled into UDP packets and sent to the remote IP
address/port or the Raven, and any packets received from the
same IP/port‐destined for the device port of Raven (see
*DPORT)‐‐are disassembled and dumped onto the serial line.
A UDP session is initiated by one of the following events:
• Using the Dial UDP (DP) AT command (example,
ATDP192.168.3.23/3456).
• Setting the Startup Mode Default (MD) to 3 (UDP) so that
a UDP session is entered automatically when the modem
registers onto the network. Serial data will be sent to the
IP/port specified in S53.
Incoming UDP packets will be processed out the serial port if
• UDP auto answer is enabled (S82=2);
• The destination IP address matches that in S53 (if Friends
Mode is enabled, the IP address also needs to be present
on the Friends List);
• Or allow any IP is set (AIP=1);
• The modem is in AT mode (not in a current UDP or TCP
session).
UDP packet assembly is affected by the values of S50 (PAD
Forwarding Time‐out) and S51 (PAD Forwarding Character).
Data received in the serial buffer will be transmitted when the
idle inter‐character time‐out specified in S50 (in tenths of
seconds) occurs or when a character is received that matches
S51 (if non‐zero).
UDP Auto Answer
UDP auto answer (previously called UDP half‐open) is set
with S82=2. When set, the Raven will automatically establish a
UDP session to the source IP address and port of the UDP
packet received. The Raven will remain “locked” to this one