8
3. Extended Cable Definition
DB9 standard cable
DB9 optional cable
Item
Definition
Com 1 RS232
/dev/ttymxc0;
Com 2 RS232
/dev/ttymxc1;
Com 4 RS232
/dev/ttymxc3;
COM 5 RS232
/dev/ttymxc4;
RS422
Red A
white Z
/dev/ttymxc3;
Black B
Green Y
RS485
Red Positive pole
/dev/ttymxc4;
Black Negative pole
Note: RS232 and RS422 are alternative for COM4.
RS232 and RS485 are alternative for COM5.
It should match with standard cable when using IOIO 1; Otherwise there is a risk
of short circuit.
