EM-1220 LX User’s Manual
Introduction
Connecting to a Serial Device
Connect the serial cable between the EM-1220-DK and the serial device(s).
Serial ports P1 and P2 on EM-1220-DK use male DB9 connectors, and can be configured for
RS-232, RS-422, or RS-485 by software. The pin assignments are shown in the following table:
Male DB9 Port
RS-232/422/485 Pinouts
Pin
RS-232
RS-422
RS-485
(4-wire)
RS-485
(2-wire)
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 ---
---
---
1 2 3 4 5
6 7 8 9
Serial Console Port
The serial console port on the EM-1220-DK is a 4-pin pin-header RS-232 port. It is designed for
serial console terminals, which are useful for identifying the EM-1220-LX boot up message.
Serial Console Port & Pinouts
Serial Console Cable
4
3
2
1
Pin
Signal
1 TxD
2 RxD
3 NC
4 GND
Internal SD Socket
The EM-1220-DK provides an internal SD socket for storage expansion. It allows users to plug in
a Secure Digital (SD) memory card compliant with the SD 1.0 standard for up to 1 GB of
additional memory space. The internal SD socket is located on the bottom of the EM-1220-DK.
Plug the SD card into the socket directly, and remember to press the SD card in first before
removing it. Note that the SD function shares the same chipset with the DIO. If you would like to
enable the SD function, the DIO must be disabled. If you would like to enable the DIO, the SD
function must be disabled.
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