
RYZ014 Modules
Use Cases with AT Commands
R19AN0075EU0150 Rev.1.50
Page 9 of 76
Mar.15.22
2.1.3 Error Handling
•
The SIM card is read only when the modem is in
CFUN=1
(fully functional) or CFUN=4 (airplane mode)
states. Trying to access the SIM card with AT commands in
CFUN=0
state will result in ERROR.
•
SIM card is not present or not detected. In this case, verify that the right form SIM card is inserted
properly to the SIM slot, and check again.
Command
Response
Comment
Enable return final result code
AT+CMEE=2
OK
CME ERROR: <err> result code and
use verbose <err> values
Check SIM card state
AT+CPIN?
+CME ERROR: SIM not inserted
SIM card is not present or not detected
The
+CSUS
command requires that the UE is in
CFUN=0
state. If you get an error while using the
+CSUS
command, first check how many SIM slots are supported by the module, and second confirm the
CFUN=0
state.
Command
Response
Comment
Check the number of supported SIM slots (case only 1 slot)
AT+CSUS=?
+CSUS: 1
OK
Only one SIM slot is supported (external)
Trying to switch to the internal SIM slot results in error
AT+CSUS=1
+CME ERROR: ERROR
If the CFUN state is 1 or 4, the SIM slot cannot be switched
AT+CFUN?
+CFUN: 4
OK
AT+CSUS=1
+CME ERROR: ERROR
Change CFUN state to 0
AT+CFUN=0
OK
Check the number of supported SIM slots (case 2 slots)
AT+CSUS=?
+CSUS: 2
OK
External is #0, internal is #1.
Trying to switch to the internal SIM slot succeeds
AT+CSUS=1
OK
2.2 Configure the Operator Mode
2.2.1 Feature Description
RYZ014 modules can support up to 17 LTE bands. Scanning all the bands takes several minutes.
Specifically, cell detection duration per candidate EARFCN is 30ms/18mJ (1.3 µAh). Scanning the full 17
bands will take 186 seconds and consume 115J (8.4 mAh).