Moxa Technologies NE-4100 - Manual (Page 26)

NE-4100 Series User’s Manual Getting Started
3-7
Selecting the Interface
The various NE-4100 Series models support 2 different serial interfaces. NE-4110S and
NE-4120S support the RS-232 interface, and NE-4110A and NE-4120A support the RS-422/485
interface. For this reason, we provide an interface selectable jumper on the NE-4110-ST and
NE-4120-ST evaluation boards, which are used with NE-4110 and the NE-4120 Series,
respectively.
For example, if you are using NE-4110S or NE-4120S modules, use the jumper to select the
RS-232 interface, as shown below.
RS485
RS232
JP2
Network Enabler
Interface
If you are using NE-4110A or NE-4120A, use the jumper to select the RS-485 interface, as shown
below.
JP2
Network Enabler
Interface
RS485
RS232
Note that jumper JP2 on the NE-4110A and NE-4120A modules are for RS-485 (2-wire) and
RS-422 (4-wire) settings. Short JP2 on the NE-4110A/4120A modules to set the serial interface to
RS-485 (2-wire) mode. Leave JP2 open to set the serial interface to RS-422 (4-wire) mode.