Digi Connect EM Hardware Reference Manual page 31

Serial/GPIO Switch Bank 3 (SW3) and Switch Bank 4 (SW4)
Each switch bank holds five slide switches that enable either serial or GPIO signaling
between the development board and the module. When set for GPIO signaling, SW3 works
in conjunction with SW1, and SW4 works with SW2. See "GPIO Switch Bank 1 (SW1)
and 2 (SW2)" on page 32 for more information. See the following table for SW3 and SW4
switch definitions.
These switches control where the development board routes a signal. They do not
Note:
reconfigure the NS7520 processor. Software should be configured to track with switch
settings. See "GPIO" on page 37 for more information
GPIO Switch Banks 3 and 4 Settings
Switch
Bank
SW3
SW4
A b o u t t h e D e v e l o p m e n t B o a r d
.
Switch Left
Number Position
1 DCD
2 CTS
3 DSR
4 RTS
5 DTR
6 TXD-1
7 RXD-1
8 TXD-2
9 RXD-2
10 Not connected
Right
Position
GPIO-1
GPIO-2
GPIO-3
GPIO-4
GPIO-5
GPIO-6
GPIO-7
GPIO-8
GPIO-9
Not connected
3 1