ME310G1 Hardware Design Guide
1VV0301588 Rev. 12
Page 47 of 96
2021-06-14
RS232 Pin
Signal
Pad
Name
Usage
4
DTR
(*)
Data Terminal
Ready
Input to the ME310G1
that controls the DTE
READY condition
5
GND
A3, A7, A9, A13, A17, B4, B6, B10, B12,
B14, B16, C19, D18, F8, F12, F18, G19,
H6, H14, J19, K18, M18, N19, P6, P14,
T8, T12, U1, V2, W19, Y2, Y4
Ground
Ground
8
C106/CTS0
AA17
Clear to Send
Output from the
ME310G1 that
controls the
Hardware flow
control
7
C105/RTS0
Y18
Request to Send
Input to the ME310G1
that controls the
Hardware flow
control
Pull-up default
during ON state
9
RING
(*)
Ring Indicator
Output from the
ME310G1 that
indicates the
incoming call
condition
Table 27: Available signs * Alternate function with GPIO, refer to par. General Purpose I/O
Note: According to V.24, some signal names are referred to the
application side, therefore on the ME310G1 side these signal are in
the opposite direction:
TXD on the application side will be connected to the receive line (here
named C103/TXD0)
RXD on the application side will be connected to the transmit line
(here named C104/RXD0)
For a reduced implementation, only the TXD, RXD lines can be
connected, the other lines can be left open provided that a software
flow control is implemented.
In order to avoid a back powering it is recommended to avoid having
any HIGH logic level signal applied to the digital pins of the ME310G1
when the module is powered off or during an ON/OFF transition
(RESET included).
