Chapter 3
Hardware
ReadyBoard 620
Reference Manual
21
Table 3-5. Serial B (COM3 and COM4) Interface Pin/Signal Descriptions (J5)
Pin #
Signal
Description
1
DCD3*
Data Carrier Detect 3 – 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 DTR3 as part of the
DTR3/DSR3 handshake.
2
DSR3*
Data Set Ready 3 – Indicates external serial communications device is powered,
initialized, and ready. Used as hardware handshake with DTR3 for overall
readiness to communicate.
3
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
RTS3*
TX3+
Request To Send 3 – Indicates Serial 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
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
CTS3*
RX3+
Clear To Send 3 – Indicates 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 -.
7
DTR3*
Data Terminal Ready 3 – Indicates Serial port 3 is powered, initialized, and ready.
Used as hardware handshake with DSR3 for overall readiness to communicate.
8
RI3*
Ring Indicator 3 – Indicates external serial communications device is detecting a
ring condition. Used by software to initiate operations to answer and open the
communications channel.
9
GND
Ground
10
NC
Not connected
11
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
DTR4/DSR4 handshake.
12
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
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
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
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
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 +.
Содержание ReadyBoard 620
Страница 1: ...ReadyBoard 620 Single Board Computer Reference Manual P N 5001820B Revision B ...
Страница 6: ...Contents vi Reference Manual ReadyBoard 620 ...
Страница 44: ...Chapter 4 BIOS Setup Utility 38 Reference Manual ReadyBoard 620 ...
Страница 46: ...Appendix A Technical Support 40 Reference Manual ReadyBoard 620 ...
Страница 49: ...Index ReadyBoard 620 Reference Manual 43 references 1 weight ReadyBoard 620 12 ...
Страница 50: ...Index 44 Reference Manual ReadyBoard 620 ...