Quote Originally Posted by oyvse View Post
The programming cable is made from the cord of the charger and USB-TTL adapter with 3.3V levels

STP-8xxx
1 charge - 10,1 V
2
3
4 black GND
5
6
7
8
9 brown CTS#
10 green RTS#
11 blue DSR#
12 yellow RxD
13 orange TxD
14 gray DTR#
15
16
17
18 charge + 10,1 V
Attachment 44143
We are talking about a different radio.
STP8X doesn't have the same pinout like the regular STP series.
You need pin 5, 10 and 11 on the RSM connector.