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Chapter 19 – Antenna Commands
Notes:
1. If periodic antenna diagnostic checking is enabled and the modem enters sleep mode, it will
awaken at the intervals specified to perform the antenna checks. Disable periodic checking if
you do not want to wake from sleep for periodic checking.
2. If a failure (open or short) of the secondary antenna is detected and the antenna is powered,
we recommend that you disable power to the antenna and suspend GPS operation while the
fault condition persists. This will reduce power consumption of the modem while the antenna
is not usable.
3. For hardware versions 2.1 and later, the diagnostic status of the secondary antenna cannot
be determined in the un-powered state (AT+WANT=0) and will report NORMAL.
4. If the hardware version is 2.1 or later and a shorted condition occurs on the secondary
antenna in the powered state, the hardware will automatically disable power to the secondary
antenna to prevent damage to the modem. In this case, you must re-issue AT+WANT=1 to
re-enable power to the secondary antenna.
Configure Antenna Diagnostics ADC +WANTADC
Description:
Syntax:
By default, the antenna diagnostics feature uses an internal ADC for reading the primary and
secondary antenna voltage divider. A primary CDMA antenna design that does not use the
modem’s primary antenna connection can still take advantage of antenna diagnostics. Using the
AT+WANTADC command, the modem can be instructed to monitor one of the external ADC’s to
read the voltage divider network of the external antenna rather than the internal ADC.
The AT+WANTADC setting is persistent across power downs.
Command Syntax: AT+WANTADC=<sel>
Command
AT+WANTADC=1
Note: Selects ADC_0 to read the primary antenna voltage
divider
AT+WANTADC
Note: Sets the internal ADC to read the primary antenna voltage
divider
AT+WANTADC=0
Note: Sets the internal ADC to read the primary antenna voltage
divider
AT+WANTADC?
Note: Display the ADC used to read the primary antenna voltage
divider
Possible Responses
OK
OK
OK
+WANTADC: 0
OK
Values:
<sel>
0
1
2
Use the internal ADC to read the primary antenna voltage divider
Use ADC_0 to read the primary antenna voltage divider. ADC_0 is available on the
system connector.
Use ADC_1 to read the primary antenna voltage divider. ADC_1 is available on the
system connector.
Multi-Tech Systems, Inc. CDMA C1 AT Commands Reference Guide (PN S000478C)
114
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