User's Guide

ME910C1 HW User Guide
1VV0301351 Rev. 2 Page 47 of 81 2017-07-19
6 C107/DSR
P14
Data Set Ready
Output from the ME910C1
that indicates the module is
ready
7 C106/CTS
P15
Clear to Send
Output from the ME910C1
that controls the Hardware
flow control
8 C105/RTS
L14
Request to Send
Input to the ME910C1 that
controls the Hardware flow
control
9 C125/RING
R14
Ring Indicator
Output from the ME910C1
that indicates the incoming
call condition
NOTE:
According to V.24, some signal names are referred to the
application side, therefore on the ME910C1 side these
signal are on the opposite direction:
TXD on the application side will be connected to the
receive line (here named C103/TXD)
RXD on the application side will be connected to the
transmit line (here named C104/RXD)
For a minimum implementation, only the TXD, RXD lines
can be connected, the other lines can be left open provided
a software flow control is implemented.
In order to avoid a back powering effect it is recommended
to avoid having any HIGH logic level signal applied to the
digital pins of the ME910C1 when the module is powered
off or during an ON/OFF transition.