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M12 Hardware Design

M12_HD_V3.3 - 57 -

HIGH

LOW

120ms

Idle or talking

URC or

SMS received

Figure 40: RI behaviour of URC or SMS received

3.13. Network status indication

The NETLIGHT signal can be used to drive a network status indicator LED. The working state of

this pin is listed in Table 19.

Table 19: Working state of the NETLIGHT

State

Module function

Off

The module is not running.

64ms On/ 800ms Off

The module is not synchronized with network.

64ms On/ 2000ms Off

The module is synchronized with network.

64ms On/ 600ms Off

GPRS data transmission is ongoing.

A reference circuit is shown in the following figure.

Module

NETLIGHT

4.7K

47K

300R

VBAT

Figure 41: Reference circuit of the NETLIGHT

Quectel

Confidential

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Eddy Wireless SD Cards Series Spezifikationen Seite 58