Multi-Tech Systems CDMA Wireless Modem manual Signal Quality +CSQ, At+Csq

Chapter 6 – Network Service Commands

CHAPTER 6 - NETWORK SERVICE COMMANDS

Signal Quality +CSQ

Description: This command is used to ascertain the received signal strength indication (<rssi>) and the channel frame error rate (<fer>). The exact meaning of the SQM (RSSI) value is manufacturer defined.

Note: See Chapter 24 for Sprint® specific version of this command.

Values: <rssi>:

0-31: Valid value ranges.

255: Represents an unknown signal quality.

<fer>:

99: Not known or not detectable. Currently always returns 99.

Syntax: Command syntax: AT+CSQ

Command

AT+CSQ

Possible Responses

+CSQ: <rssi>,<fer>

OK

Note: <rssi> and <fer> as defined below

Mode Preference +COPS

Description: The Mode Preference of a CDMA modem governs the basic system acquisition behavior of the MS in conjunction with the PRL (Preferring Roaming List). It’s important to note that the PRL takes precedence over mode preference when guiding the phone to a band or system. The PRL must allow a particular band first, before the mode preference can take effect. In other words, a mode preference change is simply a request; the PRL decides whether or not to allow it. After execution of the +COPS command, an unsolicited +COPS: <mode> will follow soon to confirm the new mode selection, but not in all cases. See Unsolicited Result Codes in Chapter 3. All changes to +COPS are automatically saved in NV RAM.

Note 1: AMPS selection is available only in modems that support AMPS mode.

Note 2: Refer to Chapter 20 for AT commands that are applicable to AMPS operation.

Note 3: This command is not available in Sprint®. and Verizon. software versions.

Note 4: CDMA Only (<mode> 1) is the only available mode in RUIM software versions. An attempt to select any other mode in RUIM software versions will result in an error return.

Values: The parameter values are the following ones:

<mode>

0: Automatic.

1: CDMA Only.

2: CDMA or AMPS only.

3: Analog only.

<term>

0: Permanent – this mode persists until another +COPS command is issued

1: Power cycle – this mode persists until power cycle is performed

Note:

1: AT+COPS by itself is a short-hand equivalent to AT+COPS=0,0.

Multi-Tech Systems, Inc. CDMA Wireless AT Commands - PN S000294C 44