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Chapter 3
Hardware
46
Reference Manual
LittleBoard 550
Pin #
Pin #
DB9
Signal
Description
11
1
(COM4)
DCD4* Data Carrier Detect 4 – Indicates external serial communications device
is detecting a carrier signal (i.e., a communication channel is currently
open). In direct connect environments, this input will be driven by DTR4
as part of the DTR/DSR handshake.
12
6
DSR4* Data Set Ready 4 – Indicates external serial communications device is
powered, initialized, and ready. Used as hardware handshake with DTR4
for overall readiness to communicate.
13
2
RXD4
RX4-
Receive Data 4 – Serial port 4 receive data in
RX4- – If in RS485 or RS422 mode, this pin is Receive Data 4 -.
14
7
RTS4*
TX4+
Request To Send 4 – Indicates Serial port 4 is ready to transmit data.
Used as hardware handshake with CTS4 for low level flow control.
TX4+ – If in RS485 or RS422 mode, this pin is Transmit Data 4 +.
15
3
TXD4
TX4-
Transmit Data 4 – Serial port 4 transmit data out
TX4- – If in RS485 or RS422 mode, this pin is Transmit Data 4 -.
16
8
CTS4*
RX4+
Clear To Send 4 – Indicates external serial communications device is
ready to receive data. Used as hardware handshake with RTS4 for low
level flow control.
RX4+ – If in RS485 or RS422 mode, this pin is Receive Data 4 +.
17
4
DTR4* Data Terminal Ready 4 – Indicates Serial port 4 is powered, initialized,
and ready. Used as hardware handshake with DSR4 for overall readiness
to communicate.
18
9
NC
Not connected (Ring Indicator 4)
19
5
GND
Ground
20
NC
NC
Not connected
Notes:
The shaded area denotes power or ground. Signals are listed in the following order: RS232
followed by RS485/RS422
Содержание LittleBoard 550
Страница 1: ...LittleBoard 550 Single Board Computer Reference Manual P N 5001740A Revision A...
Страница 26: ...Chapter 2 Product Overview 20 Reference Manual LittleBoard 550...
Страница 68: ...Chapter 3 Hardware 62 Reference Manual LittleBoard 550...
Страница 88: ...Appendix A Technical Support 82 Reference Manual LittleBoard 550...
Страница 90: ...Appendix B Connector Part Numbers 84 Reference Manual LittleBoard 550...
Страница 98: ...Index 92 Reference Manual LittleBoard 550...
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