Quectel M20 - Network Status Indication

M20 Hardware Design
RI0
Idle or
talking
URC or
SMS Received
HIGH
LOW
120ms
Figure 40
: RI0 behaviour of URC or SMS received
3.14 Network status indication
The NETLIGHT signal can be used to drive a network status indication LED. The working state
of this pin is listed in Table 26.
Table 26: Working state of 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 transfer is ongoing.
A reference circuit is shown in Figure 41:
Module
300R
4.7K
47K
VBAT
NETLIGHT
Figure 41: Reference circuit of NETLIGHT
M20_HD_V1.01 - 61 -
Quectel