Behavior Of The Ri - Quectel UC15 Hardware Design

The following figure is an example of connection between module and PC. A RS232 level shifter IC or
circuit must be inserted between module and PC, since UART interface do not support the RS232 level,
while support the CMOS level only.
NOTES
1. Rising edge on DTR will let the module exit from the data mode by default. It can be disabled by
command. Refer to document [1] about AT&D and AT&V for details.
2. DCD is used as data mode indication. Please refer to document [1] about command AT&C and
AT&V for details.

3.10. 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.
UC15_Hardware_Design
Figure 19: RS232 Level Shift Circuit
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