Behavior Of The Ri - Quectel UC20 Manual

A reference circuit is shown in the following figure.

3.17. Behavior of the RI

You can use command AT+QCFG="risignaltype", "physical" to configure RI behavior:
No matter which port URC is presented on, URC will trigger the behavior on RI pin.
NOTE
URC can be output from UART port, USB AT port and USB modem port by command AT+QURCCFG.
The default port is USB AT port.
In additional, RI behavior can be configured flexible. The default behavior of the RI is shown as below.
Table 23: Behavior of the RI
State
Idle
URC
The RI behavior can be changed by command AT+QCFG="urc/ri/ring", refer to document [1] for
details.
UC20_Hardware_Design
Module
SLEEP_IND
Figure 33: Reference Circuit of the SLEEP_IND
Response
RI keeps high level.
RI outputs 120ms low pulse when new URC returns.
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