
Chapter 5 – Network Service Commands
Multi-Tech Systems, Inc. CDMA Wireless AT Commands (PN S000294J)
29
Chapter 5 – 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>).
Note:
See Chapter 24 for Sprint® specific version of this command
.
Values:
<rssi>
The lowest value is 0 and the highest value is 31.
0 = 110dBm, 31 = -75dBm. 1.09375dBm per step.
Note:
Certain models use a range other than 0 – 31.
10-31
Sufficient ranges.
0-9
Weak or insufficient
99
No signal.
<fer>
99
Not known or not detectable. Currently always returns 99.
Syntax:
Command syntax:
AT+CSQ
Command
Possible Responses
AT+CSQ
+CSQ: <rssi>,<fer>
OK
Note: <rssi> and <fer> as defined above
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 21. 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 aCOPS command is issued
1
Power cycle – this mode persists until power cycle is performed
Note:
AT+COPS by itself is a short-hand equivalent to AT+COPS=0,0.
Syntax on next page.