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FIBOCOM MC610 Series Hardware Guide
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Table 3-12 UART2 pins
Pin Name
I/O
Pin
Description
U2RXD
I
39
Module receiving data
U2TXD
O
40
Module transmitting data
U2CTS
I
75
Module clearing transmitting
U2RTS
O
76
DTE request to transmit data
Table 3-13 UART3 pins
Pin Name
I/O
Pin
Description
U3RXD
I
77
Module receiving data
U3TXD
O
78
Module transmitting data
Table 3-14 DEBUG serial port pins
Pin Name
I/O
Pin
Description
DBG_RXD
I
94
Module receiving data
DBG_TXD
O
93
Module transmitting data
3.6.2 UART Interface Application
The serial port level of MC610 series modules is 1.8 V by default. If the level of the customer host system
is 3.3 V or others, it is necessary to add a level converter in the serial port connection between the module
and the host. The following figure shows the design of reference circuit using level conversion chip:
