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Chapter 3
Hardware
42
Reference Manual
LittleBoard 700
Pin #
Pin #
DB9
Signal
Description
14
7
RTS2*
TX2+
Request To Send 2 – Indicator to serial output port 2 is ready to transmit
data. Used as hardware handshake with CTS2 for low level flow control.
TX2+ – If in RS485 or RS422 mode, this pin is Transmit Data 2 +.
15
3
TXD2
TX2-
Transmit Data 2 – Serial port 2 transmit data out
TX2- – If in RS485 or RS422 mode, this pin is Transmit Data 2 -.
16
8
CTS2*
RX2+
Clear To Send 2 – Indicator to serial port 2 that external serial
communications device is ready to receive data. Used as hardware
handshake with RTS2 for low level flow control.
RX2+ – If in RS485 or RS422 mode, this pin is Receive Data 2 -.
17
4
DTR2*
Data Terminal Ready 2 – Serial port 2 indicator that port is powered,
initialized, and ready. Used as hardware handshake with DSR2 for
overall readiness to communicate.
18
9
NC
Not Connected
19
5
GND
Digital Ground
20
NC
NC
Not connected
Notes:
The shaded area denotes power or ground. Signals are listed in the following order RS232 and
RS485/RS422.
Table 3-15. Serial B Interface Pin/Signal Descriptions (J13)
Pin #
Pin #
DB9
Signal
Description
1
1
(COM3)
DCD3* Data Carrier Detect 3 – Indicator to serial port 3 that external modem is
detecting a carrier signal (i.e., a communication channel is currently
open). In direct connect environments, this input will be driven by
DTR3 as part of the DTR/DSR handshake. Designed for direct input
from external RS232 receiver.
2
6
DSR3*
Data Set Ready 3 – Indicator to serial port 3 that external serial
communications device is powered, initialized, and ready. Used as
hardware handshake with DTR3 for overall readiness to communicate.
Designed for direct input from external RS232 receiver.
3
2
RXD3
RX3-
Receive Data 3 – Serial port 3 receive data in
RX3- – If in RS485 or RS422 mode, this pin is Receive Data 3 -.
4
7
RTS3*
TX3+
Request To Send 3 – Indicator to serial output port 3 is ready to transmit
data. Used as hardware handshake with CTS3 for low level flow
control.
TX3+ – If in RS485 or RS422 mode, this pin is Transmit Data 3 +.
5
3
TXD3
TX3-
Transmit Data 3 – Serial port 3 transmit data out
TX3- – If in RS485 or RS422 mode, this pin is Transmit Data 3 -.
6
8
CTS3*
RX3+
Clear To Send 3 – Indicator to serial port 3 that external serial
communications device is ready to receive data. Used as hardware
handshake with RTS3 for low level flow control.
RX3+ – If in RS485 or RS422 mode, this pin is Receive Data 3 -.
Содержание Little Board 700
Страница 1: ...Little Board 700 Single Board Computer Reference Manual P N 5001670A Revision D...
Страница 6: ...Contents vi Reference Manual LittleBoard 700...
Страница 10: ...Chapter 1 About This Manual 4 Reference Manual LittleBoard 700...
Страница 26: ...Chapter 2 Product Overview 20 Reference Manual LittleBoard 700...
Страница 82: ...Chapter 4 BIOS Setup 76 Reference Manual LittleBoard 700...
Страница 84: ...Appendix A Technical Support 78 Reference Manual LittleBoard 700...
Страница 86: ...Appendix B Connector Part Numbers 80 Reference Manual LittleBoard 700...
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