Sierra Wireless DART 200 CDPD Modem manual Basic communications

DART 200 CDPD Modem User’s Guide 2 Installation and Setup

Basic communications

The final step in the initial setup process is to confirm that the DART 200 can communicate with the network by performing a ping. The DART 200 sends a fixed length character string to another device that is registered on the network, and requests that it be echoed back. However, to do a ping you need the address of another registered device.

Get two addresses to ping: a network server or Domain Name Server (DNS), and a second DART adjacent to the first. Get the IP Address of a network server or DNS from your carrier at the same time you get your IP Address assigned. If you can ping the server or DNS, basic connectivity is functional. If you can ping a device, such as a second DART, on the other side of the MDIS, then network connectivity is established.

Ping is executed by the AT*P command, as shown in this example:

at*p198.225.191.25

Press <ENTER> to stop

PING Host (198.225.191.25): 60 data bytes & 8 header bytes

68 bytes from 198.225.191.25: icmp_sn=0. time=1380. ms TSR=7631.250S

68 bytes from 198.225.191.25: icmp_sn=1. time=920. ms TSR=7632.280S

68 bytes from 198.225.191.25: icmp_sn=2. time=790. ms TSR=7633.180S

68 bytes from 198.225.191.25: icmp_sn=3. time=1340. ms TSR=7634.620S

68 bytes from 198.225.191.25: icmp_sn=4. time=1440. ms TSR=7639.660S

68 bytes from 198.225.191.25: icmp_sn=8. time=860. ms TSR=7636.180S

68 bytes from 198.225.191.25: icmp_sn=5. time=1450. ms TSR=7637.730S

68 bytes from 198.225.191.25: icmp_sn=6. time=900. ms TSR=7638.740S

68 bytes from 198.225.191.25: icmp_sn=7. time=820. ms TSR=7640.620S

----198.225.191.25 PING Statistics----

10 packets transmitted, 10 packets received, 0% packet loss

0 sequence errors round-trip (ms) min/avg/max = 790/1127/1450

The ping executes continuously until the <CR> key is pushed. The ping command is covered in detail in Appendix F, DART AT Command Set.

If the network server and another device were successfully pinged, the initial operation is complete and you are ready to begin application testing.

The time since reset (TSR) field represents the time in seconds since the modem was last reset (through an AT-Rcommand or a power cycle). Problems with the ping are usually seen as time-outs. Most devices respond in less than 2 seconds using the default ping packet size. Both packet size (60 bytes plus an 8 byte header) and the time-out period (default is 10 seconds) are in S-Registers 71 and 70 and can be changed. If you increase the size of the packet, consider increasing the time-out period to allow for the longer transit time of the larger packet.

PN1197-00 Revision 1.0 2-21