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M80 EVB User Guide

M80_EVB_UGD_V1.2 - 25 -

Figure 24: Pins of main UART

Table 9: Pins of Serial port

Signal

I/O

Description

Note

DCD

Data carrier detection

TXD

Transmit data

RXD

Receive data

DTR

Data terminal ready

GND

Ground

RTS

Request to send

CTS

Clear to send

Ring indicator

Note: The above pins are RS232 voltage level.

The CMOS level of UART signal can be test through test points below. Customer can use these

test points to verify the design between customer device and the module.

Quectel

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Sim2 M80 Guida Utente Pagina 26