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Figure 15: Indicator LED
Table 7: Status of the NETLIGHT indicator (Green)
Status
HDM1004G behavior
Off
HDM1004G is not running
64ms On/ 800ms Off
HDM1004G not registered the network
64ms On/ 3000ms Off
HDM1004G registered to the network
64ms On/ 300ms Off
LTE communication is established
6.6
SIM Card Interface
The SIM interface complies with the GSM Phase 1 specification and the new GSM Phase
2+ specification for FAST 64 kbps SIM card. Both 1.8V and 3.0V SIM card are supported. The
SIM interface is powered from an internal regulator inside the terminal.
HDM1004G supports SIM card “hot” plug, which means that the terminal can sense the
SIM card inserted in or drawn out when the module is on
AT command “AT+CSDT” is used to enable or disable SIM card detection function. For
details of this AT command, please refer to the following table.
Table 8: AT+CSDT Switch On or Off Detecting SIM Card
AT+CSDT Switch On or Off Detecting SIM Card
Test Command
AT+CSDT =?
Response
+CSDT: (0-1)
OK
Parameter
See Write Command
Read Command
AT+CSDT?
Response
+CSDT: <mode>
OK
Parameter
See Write Command
