Sierra Wireless DART 200 CDPD Modem - Manual (Page 77)

DART 200 CDPD Modem User’s Guide 5 DART Supported Protocols
PN1197-00 Revision 1.0 5-23
• TCP/IP keep-alives (*Kn)
• TCP PAD operating mode (\On)
• Telnet keep-alives (*Tn)
• Automatic transmit control (\Tn)
The following profile parameters are operational in command or SLIP
modes and need to be evaluated to determine their proper settings:
• Command mode echo (En)
• Data set ready (DSR) operation (&Sn)
• Online mode echo (Fn)
• Restrict Channel Selection (\Jn)
• Quiet mode (Qn)
• Side preference (\Nn)
• Verbose mode (Vn)
• Flow control (\Qn)
• Extended result codes (Xn)
• Reception of IP broadcasts (*Bn)
• Data carrier detect (DCD) operation (&Cn)
• SLIP TCP header compression (*Cn)
• Data terminal ready (DTR) operation (&Dn)
• SLIP Multicast address selection (*Gn)
• Escape code recognition (&En)
• Automatic SLIP Restart (*Rn)
SLIP Header Compression (*C) and Flow Control (\Q) are the key
parameters. They must match the stack settings for SLIP to operate.
1. Setting SLIP header compression on saves a small amount of time
(recommended) in data transfer. In most commercial software stacks
this feature, if offered, is identified as CSLIP. The default setting for
this parameter is *C1 (enabled). If this setting and that of the stack
do not match SLIP cannot operate successfully. If your stack does
not support compression, you must deactivate it on the DART. To do
this execute an AT&C0, and save it with an AT&W.
2. Use hardware flow control (\Q2 - default). If this setting and that on
the stack do not match SLIP cannot operate successfully. Software
flow control or no flow control are inappropriate.
3. Set Channel Restrictions (\J), and Side Preference (\N)
appropriately, as described in Basic modem personalization, p. 2-6,
but these settings are CDPD, not SLIP related.
4. Set the COM port for 8 data bits and NO parity (8N1). Since SLIP
operates in binary mode, a data byte could be any 8-bit
configuration, so parity must be disabled to permit proper operation.
5. Set the DART 200 COM port speed to match that of the stack: 19.2
Kbps is recommended. This can be accomplished by an AT&L &W
command.