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User’s Guide Getting Started
2110212 Rev 1.0 Page 15
The DART 300 LED indicator also reflects the modem’s registration status. The flash patterns are
as follows:
• On steady (not flashing) indicates power is on but no CDPD channel is visible. The modem is
typically scanning for a channel at this time. During the first few seconds from power-up, the
modem is initializing and the LED will appear dim.
• Flashes on once per second if the modem has acquired a CDPD channel but is not yet
registered.
• Flashes on twice per second if the modem is registered on a CDPD channel.
• Off indicates the modem is in CDPD sleep mode (or has no power).
Monitor the modem’s LED indicator to determine if it can acquire a CDPD channel (flashes once
per second). If it fails to do this within a few minutes then check the antenna connection and
placement. Consult Section 10.1 on antenna installation for guidance.
If the modem can acquire a channel but does not register within a few minutes, you can determine
the reason by attempting a manual registration:
1. +WPDEREG to force the modem out of auto-registration.
2. +WPREG to attempt to register manually.
The modem allows up to 30 seconds to register. If it fails, a reason is given. If the modem has
simply timed out, then retry the registration command in step 2.
A message of DENIED_MDIS_INCAPABLE means that the CDPD network is not able to handle
the registration at this time and you should retry later. If the error persists, contact the CDPD
carrier for assistance.
Any other registration failure, with a DENIED_… message, will require the attention of your
CDPD service provider to clear up the problem. Contact them and report the registration failure
message from the modem. Additional troubleshooting assistance is in Section 13.
When the modem has successfully registered, enter:
3. +WS173=1 to restore auto-registration.
3.6.2. PING
After registration, you should confirm that you can communicate with the modem over the
network.
PING is a utility to test connections across an IP network. PINGs are packets of data with special
flags in the header, which advise the protocol stack at the receiving end to echo the packet back.
The sender typically times the duration from transmission to echo receipt to determine the speed
of the network link. The application at the receiving end of a PING has no knowledge of the
transaction. It is handled within Layer 3 of the protocol stack.
When the modem is registered, you can issue PINGs from another CDPD-based modem, or over
the Internet, and the DART 300 should reply. If you are using a SLIP/PPP connection, the stack
on the host will be responsible for replies to PINGs. If you use either the UDP or TCP packet
services in the DART 300 modem, then the modem will handle the PING without the host’s
knowledge.
DART 200
The DART 200 includes the ability to both answer and generate PINGs (*P) but the
DART 300 only supports answering. PINGs from the DART 300 must originate with
the attached host device using a SLIP/PPP mode connection.