User's Manual

W311/321/341 Hardware User’s Manual Hardware Connection Description
Connecting to a Serial Device
Your serial device can plug into the embedded computer’s serial port using a serial cable. Serial
ports P1 to P4 have male DB9 connectors and can be configured for RS-232, RS-422, or RS-485
communication through software. The pin assignments are shown in the following table:
DB9 Male Port RS-232/422/485 Pinouts
54321
9876
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 --- --- ---
Serial Console Port
The serial console port is a 4-pin pin-header RS-232 port. It is designed for serial console
terminals, which are useful for viewing boot-up messages.
Serial Console Port & Pinouts Serial Console Cable
4
3
2
1
Pin Signal
1 TxD
2 RxD
3 NC
4 GND
SD Slot
The W311/321/341 provide an SD slot for storage expansion. Moxa provides an SD flash disk for
plug & play expansion that allows users to plug in a Secure Digital (SD) memory card compliant
with the SD standard V1.0 for up to 1 GB of additional memory space. The following steps show
you how to install SD card into the W311/321/341.
W311/321
The SD slot is located on the right side of the W311/321 enclosure. To install an SD card, you
must first remove the SD slot’s protective cover to access the slot, and then plug the SD card
directly into the slot.
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