7
2.3 UART ch.0 select jumper
The connection destination of the UART ch.0 signal can be selected by J20/J21.
These jumpers location and settings are shown below.
Figure 6 UART ch.0 select jumper location
Table 5 J20, J21 setting
Setting
Function select
1-2
RS232C (default)
2-3
USB
J21
J20
3
2
1
From right to left 1, 2, 3
J20:TX , J21:RX