Moxa Technologies G2150I Signal Quality +CSQ, Operator Selection +COPS, Error Responses Meaning

OnCell G2150I AT Command Set Network Service Commands

Signal Quality: +CSQ

Description: This command is used to ascertain the received signal strength indication (<rssi>) and the channel bit error rate (<ber>) with or without a SIM card inserted.

Command syntax: AT+CSQ

Command	Possible responses
AT+CSQ	+CSQ: <rssi>,<ber>
	OK
	Note: <rssi> and <ber> as defined below

Defined values: <rssi>:

013 dBm or less

111 dBm

2to 30 -109 to –53 dBm

31 -51dBm or greater

99not known or not detectable

<ber>:

0…7 as RXQUAL values in the table GSM 05.08

99 not known or not detectable

Operator Selection: +COPS

Description: There are three possible ways of selecting an operator (PLMN):

•The product is in manual mode. It then tries to find the operator specified by the application and if found, tries to register.

•The product is in automatic mode. It then tries to find the home operator and if found, tries to register. If not found, the product automatically searches for another network.

•The product enters into manual/automatic mode, and then tries to find an operator as specified by the application (as in manual mode). If this attempt fails, it enters automatic mode. If this is successful, the operator specified by the application is selected. The mobile equipment then enters into automatic mode.

Note: The read command returns the current mode and the currently selected operator. In manual mode, this PLMN may not be the one set by the application (as it is in the search phase).

These commands are not allowed during communication.

Command syntax: To force an attempt to select and register on a network, the application must send the following command:

Command syntax: AT+COPS=<mode>, [<format> [ , <oper> ] ] Possible responses for AT+COPS=<mode>:

ERROR Responses	Meaning
OK	Network is selected with full service
+CME ERROR: 30	No network service
+CME ERROR: 32	Network not allowed – emergency calls only
+CME ERROR: 3	Not allowed during Communication
+CME ERROR: 4	Incorrect parameters
+CME ERROR: 527	Please wait, and retry your selection later
+CME ERROR: 528	Location update failure – emergency calls only
+CME ERROR: 529	Selection failure – emergency calls only
+CME ERROR: 546	Emergency call is not allowed without SIM
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