"The Y cable is connected to the SDA 100 Data IN, radio port, points 2 (RXD) 
and 5 (ground)"

You also need to link 7 and 9 on the SDA 100 connector.  Pin assignments on the 
SDA 100 connector are not typical RS-232.

"PINOUT of 9 pin SUBD DATA IN CONNECTOR
1. Data out RXD
2. RXD to RS232 Radio TXD
3. TXD to Radio RXD
4. TTL Kenwood and active high for Radio CTS
5. Signal Ground
6.
7. TTL version of pin 2
8. NC
9. TTL RXD for Steppir."

Andy, k3wyc


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