DART 200 CDPD Modem User’s Guide | 5 DART Supported Protocols |
Host TCP setup
The host (client) modem is set up to support polling of remote devices by the host computer. The host uses flow control and the data being sent is binary, not character data. The polling function does not require the TCP server, but requires flow control, and timed data forwarding because of the binary data.
Use this setup only for bench testing or a limited use trial. A production application uses a leased line, frame relay, or Internet connection between the host and the MDIS instead of a modem. In the latter scenario, the production host application needs to include a software stack (replacing the modem stack) to operate with the CDPD network.
In Table
Table 5-4. Host TCP setup
AT Command | Req Opt Def Description | |
AT^Annn.nnn.nnn. | R | Input IP Address (if not already done) |
nnn |
|
|
AT\N[1,2] | R | Side Preference (get from carrier) |
AT\J0 | D | Use default - No channel access |
AT\R4 |
| restrictions |
R | Auto Registration at Power On | |
ATS13=0 | R | With AT\R4 sets Continuous Automatic |
AT\O0 |
| Registration |
R | PAD mode is required for TCP. | |
AT*A0 | D | Use default - No server required |
AT*L2100 | D | Use default - Listen on port 2100 |
ATE0 | O | No command mode character echo |
ATV0 | O | Use terse result codes |
ATQ0 | D | Use default - Result codes are sent to the |
ATF1 |
| host |
D | Use default - Do not echo transmitted | |
ATX1 |
| data to the host |
D | Use default - Extended result codes | |
AT&C1 | D | Use default - DCD follows state of the |
AT&D0 |
| connection |
D | Use default - You may want to consider | |
AT&E2 |
| using DTR to escape |
O | Filter escape sequence from output | |
AT&S0 | D | Use default - DSR is always active |
AT\F3 | D | Use default - Applies only if \M1 |
AT\M0 |
| specified |
D | Use default - Do not recognize data | |
AT\Q2 |
| forwarding characters |
D | Use default - Most PC’s use flow | |
AT\T1 |
| control |
D | Timed data forwarding - Always use | |
AT*B0 |
| with binary data |
D | Use default - Does not apply to TCP | |
AT*C1 | D | Use default - Does not apply to TCP |
AT*G1 | D | Use default - Does not apply to TCP |
