Autostar End of 505 connector cable — rj10 (the smaller “Handset” size)
+-----------+ 1- Data TO Autostar Black
| 1 2 3 4 | 2- Data FROM Autostar Red
+---+ +---+ 3- not used Green
|___| 4- ground Yellow
Hole in Autostar
Other end of cable
1- Astar Rcv: data -to- Autostar (PC pin 3) (25/2)
+-----------+ 2- Astar Xmt: data -from- Autostar (PC pin 2) (25/3)
| 4 3 2 1 | 3- not connected
+---+ +---+ 4- ground reference (PC pin 5) (25/7)
|___|
Looking at holes on end of 505 cable
2- data to PC Yellow, 3 - data from PC Red, 5- ground Black
---------------
\ 5 4 3 2 1 /
\ 9 8 7 6 /
-------
Yellow on autostar to Black on RS232 - common ground
Red on autostar to Yellow on RS232 - transmit data from autostar to PC
Black on autostar to Red on RS232 - transmit data from PC to autostar
