Quectel BC68 Hardware Design

GSM/GPRS Module Series
M66 Hardware Design
M66_Hardware_Design Confidential / Released 36 / 80
Three-line connection is shown as below.
TXD
RXD
GND
UART port
TXD
RXD
GND
Module (DCE)
Host (DTE)
Controller
Figure 15: Reference Design for UART Port
UART Port with hardware flow control is shown as below. This connection will enhance the reliability of
the mass data communication.
RTS
CTS
RTS
CTS
GND
RXD
TXD TXD
RXD
GND
Module (DCE)
Host (DTE)
Controller
Figure 16: Reference Design for UART Port with Hardware Flow Control
3.7.1.3. Firmware Upgrade
The TXD, RXD can be used to upgrade firmware. The PWRKEY pin must be pulled down before firmware
upgrade. The reference circuit is shown as below:
Quectel
Confidential

Quectel BC68 Specifications

General

Brand	Quectel
Model	BC68
Category	Control Unit
Language	English