Configuration and Use | DART 300 Modem |
Modem Configuration
The device is used as a server, answering client requests for polls (monitoring function) and settings (control functions).
Using a terminal application on a PC, set the communication link to 19200,8,N,1 with hardware flow control on. “AT” is omitted for brevity.
Table
Command | Remarks |
|
|
+WPNEI=<ip> | Set the modem’s NEI |
+WS174=<n> | Set the side preference |
+WS173=1 | Ensure |
+WS175=0 | Disable Sleep. (Default) |
+WS45=0 | Set UDP PAD. See the Protocol Considerations below. |
+WS212=<port> | Set the listening port for the server. |
+WS217=30 | Set a 3 second server receive lock. This allows the RTU plenty |
| of time to respond to client queries. |
S0=1 | Ensure |
S30=0 | Disable the session timeout. (Default) |
[+WVFRIENDLIST] | Optionally enter a Friends List. |
+WS62=0 | Disable local PAD echo. The RTU must not be echoed its own |
| transmissions. If it is, it will treat each character as a command |
| and issue a string in response. That string in turn creates more |
| commands. This quickly escalates like a thermonuclear |
| reaction. |
+WS72=0 | Disable PAD editing. The RTU does not send <BS> to correct |
| mistakes. |
+WS64=13 | Use the <CR> as the primary forwarding character. (Default) |
+WS63=3 | Include the <CR> in the packet. (Default) This is useful for |
| reading the messages on a |
| replies to an automated application. |
+WS70=5 | PAD will forward a packet on 0.5 seconds idle from the RTU. |
| This is a backup if the RTU fails to terminate a line with a |
| <CR>. |
[+WS74=<n>] | Optionally set a packet length limit below the default of 1000. |
| The combination of primary forwarding character and inter- |
| character timer should prevent the need for setting this below |
| the default. |
&D0 | Ignore DTR. The cable artificially asserts the signal. |
S12=100 | Sets a 2 second guard time on the standard escape sequence – |
| just in case. This provides a method for a service technician to |
| escape data state, if needed. |
+WS60=0 | Disable TIES. The RTU can never send it. |
E0 | Echo off in command mode. This prevents the modem from |
| echoing back transmissions when it does not have an open |
| session. This is needed for the same reason the PAD echo was |
| disabled. |
Page 74 | 2110212 Rev 1.0 |
