17. Confirm and that you are registered on the cellular network.
AT+CSS?
A reply of
+CSS?
2,Z,99999
indicates that you are not registered. It may take up to 15 seconds or so after
power-up to register on the network. Once registered a typical response will be
+CSS?:
1,A,4152
where 1 is the band class, 1=800 MHz, 2=1900 MHz, A-F is the band (Z
indicates not registered on network), 4152 is the SID, i.e. the cell tower ID, (99999
indicates not registered on network).
18. Test
CSD
Origination
by calling your cell phone with
ATDT5551234567
(replace
5551234567 with your cell phone number). Once the phone rings and you answer the
phone, you should hear sounds like a fax negotiation.
19. Test
CSD Termination
by calling the phone number of your modem. Once it answers
you should hear sounds like a fax negotiation. Hang up.
20. To further test CSD termination connect another modem, (landline or cellular) to another
available COM port on a PC. Configure that modem and the COM port to your required
speed, i.e. 9600, with
AT+IPR=9600
.
21. Start HyperTerminal on that PC’s COM port and call the Land-Cell modem from this
terminal window with the following command.
ATDT<Phone number of 819 Modem>
.
22. The terminal window connected to the 819 modem, will say “
RING
” and then once the
modems have negotiated a connection, it will say “
CONNECT
”.
23. You can now type in text in either terminal window and it will appear in the other terminal
window. This means that your modem is now answering incoming CSD data calls.
24. Type in
ATH0
to disconnect the call.
25. Once you can originate and terminate CSD calls with the modem you are ready to
connect the modem to your equipment. Please ensure that your equipment is configured
to your required data rate, i.e. 9600 bps.
26. By default the Modem is configured for full hardware flow control. This uses the control
signals, CTS and DTS, DSR and DTR, Carrier Detect, and Ring Indicator. The pin-out of
the modem is in Section 12.
27. If you are using a 3 wire interface cable with RX, TX and Ground or your equipment is
configured for no hardware flow control, you will need to disable Hardware flow control
with
AT+IFC=0,0
28. If your equipment cannot disable hardware flow control, you can spoof the signals by
shorting pins 1,4 and 6 together, and also pins 7 and 8 on the DE-9 connectors of your
three-wire cable.
