Looking for a diagram to build SRP/SRH programming cable

[0xcniaso]

Hello, i am looking for schematics to build a programming cable for Sepura SRH/SRP or buy a cheap one because i only found on in Spain and its 300€ witch is too expensive for me student
Thanks in advance

[oyvse]

TTL 3.3V
TP8X pinout, radio view top left 1, top right 2 and so on.
1 Sasi?
2 Mic-?
3 ? SPKR+?
4 ? SPKR-?
5 GND
6 Mic+?
7 GND?
8 ?
9 3,6V?
10 3,3V TTL RX
11 3,3V TTL TX
12 ?
13 ?
14 ?

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

SRM/SRG SERIES
DB-9F DB-15M

1-----------------------------------------------9
2----------------------------------------------10
3----------------------------------------------11
4----------------------------------------------14
5----------------------------------------------15
6----------------------------------------------14
7----------------------------------------------12
8----------------------------------------------13
9----------------------------------------------N/C