Telit Wireless Solutions HE910 - Page 79

HE910 Hardware User Guide
1VV0300925 Rev. 32 Page 79 of 111 2019-11-25
The following table shows the typical input value of internal pull-up resistors for RTS DTR
and TXD input lines and in all module states:
STATE
RTS DTR TXD
Pull up tied to
ON
5K to 12K
1V8
OFF
Schottky diode
RESET
Schottky diode
POWER SAVING
5K to 12K
1V8
The input line ON_OFF and RESET state can be treated as in picture below
Figure 12-1 Input Line ON_OFF
NOTE:
According to V.24, some signal names are referred to the application
side, therefore on the HE910 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)