User`s manual

EM-1240 Hardware User’s Manual EM-1240-DK Functionality
ATTENTION
This product should be mounted to a well-grounded mounting surface such as a metal panel.
V+V-
12-48V
SG
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-1240 Development Kit has 4 software-selectable serial ports. If you would like to connect
to a serial device, use male DB9 connectors. They can be configured for RS-232/422/485 by
software. Refer to the Software User’s Manual for details. Furthermore, you may also use serial
port pin headers to extend the serial port with other devices using a homemade cable. Simply
connect one end of the cable to serial port pin header and the other end of the cable to other device.
Pay attention to the cable length for the various serial communication standards. Refer to the
following figure for pinouts and pin assignments of the DB9 connector and pin header.
J1/J3/J4/J6 Serial Ports 1-4
1
Male DB9 Port
54321
9876
Pin Header
J1/J3/J4/J6
1
2
3
4
5
6
7
8
DCD
RxD
TxD
DTR
GND
DSR
RTS
CTS
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