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Circuit Switch Data (CSD) Call Setup Steps
1. Connect the modem to an active COM port on a PC with an RS-232 9 pin straight through cable.
2. Insert the SIM card into the unit. Be sure your account can support CSD calls.
3. Attach the antenna and power connector.
4. Connect with a Hyper-Terminal session set to 115,200, 8 Bits, No Parity, 1 Stop Bit, and
Hardware Flow Control enabled, the default speed of the modem.
5. Confirm contact with modem using AT+CGSN this prints out the IMEI of the modem (i.e.
355632004037819). If you get an Error or no communication, go to Section 7 on
Troubleshooting.
6. To auto-answer calls set ATS0=1 A value of ATS0=1 sets the modem to answer on the first
ring, where ATS0=0 disables the auto-answer feature. (NOTE: this is a letter S followed by a
Zero)
7. Specify the bearer service type, i.e. AT+CBST=7 will set type to 9600 V.32.
8. To set the Carrier Detect (DCD) to follow its connection state to the Cellular Network, set
AT&C1. The yellow DCD LED will turn on when connected to the Carrier, and turn off when not
connected. A value of AT&C0 sets CD to always be on, a value of AT&C2 sets CD to be always
on, but to wink when there is a change in the connection state.
9. Ensure that DTR is set to terminate the call and return the modem to command state on an ON-
to-OFF transition of DTR with AT&D2. A value of AT&D0 ignores DTR, a value of AT&D1 enters
online command state upon an ON-to-OFF transition of DTR while retaining the connected call.
10. Save the new settings in user profile with AT&W.
11. To confirm your settings, perform an AT&V. This will print out several lines of text with all the
register values.
12. Verify that you have good signal strength, AT+CSQ. A typical reply is +CSQ? 21, 0. The signal
strength (first number) ranges from 0 to 31, the higher the number the better the signal.
13. Set the modem for verbose result codes, with ATV1, this displays result codes as words, ATV0
displays result codes as numbers.
14. Confirm and that you are registered on the cellular network. Enable URC to report status of
network registration including location information using the command AT+CREG=2. Type
AT+CREG?. The reply should be similar to +CREG: 2, 1, "7D0A", "7E4D", where the 1 indicates
registration on the home network, 7D0A is the location area code in hex, and 7E4D is the cell ID
in hex.
15. Test CSD Origination by calling your cell phone with ATD<phone number>; (for example,
ATD15075551234;). Once the phone rings and you answer the phone, you should hear sounds
similar to a fax negotiation.
16. Test CSD Termination by calling the phone number of your modem. Once it answers you should
hear sounds similar to a fax negotiation. Hang up to terminate the connection.
17. 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.
18. Start HyperTerminal on the second PC's COM port and call the LandCell modem from this
terminal window with the following command. ATD<Phone number of second 819 Modem>.
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001-0003-829 Revision 1
Page 23 of 65
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