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Using the MultiTech CDMA Cellular Modem – Application Note #17 – Page 3 of 4

To Set Auto-Answer:

Auto Answer is set by changing the S0 Register from 0 (Auto Answer Disabled) to the number of rings

desired for the MultiModem to answer on. To auto answer on the second ring use the command

ATS0=2. To check the value use the command ATS0?.

To Set Incoming Call Bearer:

To set the type of incoming calls to the required Data type use the command AT+CICB=0. To check this

value use the command AT+CICB?.

To Save Configuration:

Most of the values set above will not survive a power cycling of the MultiModem and must, therefore, be

saved to NV Ram using the command AT&W.

A complete listing of the AT commands is detailed in the MultiModem Users Manual.

MultiTech MultiModem Interface Configuration

The MultiTech MultiModem is a DCE device. Typically a Campbell Scientific SC932A (CS I/O to RS232

DCE) is used to interface between the CR10X and the MultiModem. When connected in this manner to a

powered CR10X logger, the TR LED will be on steady. If callback thru the CS I/O port using the “print

instruction” to the MultiModem is needed, then pin 6 (PE/SDE) in the SC12 cable must be removed as

this signal is pulsed high and disables the SC932A.

MultiLogger Configuration

Configuration of MultiLogger is straightforward, the Network Configuration needs to include a Gateway,

Phone Modem and the Control Module. An example of the setup is shown below.

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MultiModem MTCBA-C Manual de usuario Pagina 3