Moxa EM-1220-LX DEVELOPMENT KIT Manual de usuario descargar pdf (Pagina 19)

EM-1220 Hardware User’s Manual EM-1220-DK Functionality

Grounding the EM-1220 Development Kit

Grounding and wire routing help limit the effects of noise due to electromagnetic interference

(EMI). Run the ground wire from the ground screw to the grounding surface prior to connecting

devices.

ATTENTION

This product should be mounted to a well-grounded mounting surface such as a metal panel.

V+V-

12-48V

SG: The Shielded Ground (sometimes called

Protected Ground) contact is the left most contact

of the 3-pin power terminal block connector when

viewed from the angle shown here. Connect the

SG wire to an appropriate grounded metal

surface.

Serial Ports and Pin Assignments

The EM-1220 Development Kit has 2 software-selectable serial ports. If you would like to connect

to a serial device, use male DB9 connectors. The ports can be configured for RS-232, RS-422, or

RS-485 by software. Refer to the Software User’s Manual for details. Pay attention to the cable

length for the various serial communication standards. Refer to the following figure for the pin

assignments of the DB9 connector.

Male DB9 Port

54321

9876

Pin RS-232 RS-422

4-wire

RS-485

2-wire

RS-485

1 DCD TxDA(-) TxDA(-) ---

2 RxD TxDB(+) TxDB(+) ---

3 TxD RxDB(+) RxDB(+) DataB(+)

4 DTR RxDA(-) RxDA(-) DataA(-)

5 GND GND GND GND

6 DSR --- --- ---

7 RTS --- --- ---

8 CTS --- --- ---

3-4

1 2 ... 14 15 16 17 18 19 20

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Moxa EM-1220-LX DEVELOPMENT KIT Manual de usuario Pagina 19