Telex 80 - Manual (Page 5)

IP-223 to Kenwood Radios
3
2.3.2 IP223 Rev A to Rev E Board Modifications:
Lift Pin 12(line 1) or pin 9(line 2) of U45 according to the line selected and solder to its PCB
Pad. Please refer to the Figure 1 for better demonstration.
Pin on U45 of the board
IP223 Serial
Signal
Line 1 Line 2
TK-x90 Radio DB25
TXD 11 10 10
RXD To the pad of
pin 12
To the pad of
pin 9
9
Figure 1