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Chapter 3
Table 3-4. Serial 2 (COM2) Interface Pin/Signal Descriptions (J6)
Pin #
Pin #
DB9
1
1
2
6
3
2
4
7
5
3
6
8
7
4
8
9
9
5
10
NC
Note: The shaded area denotes power or ground.
Table 3-5. Serial 3 and 4 (COM3 and COM4) Interface Pin/Signal Descriptions (J15)
Pin #
Pin #
DB9
1
1(COM3)
2
6
3
2
4
7
5
3
MightyBoard 821
Signal
Description
DCD2* Data Carrier Detect 2 – 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 DTR2 as part
of the DTR2/DSR2 handshake.
DSR2*
Data Set Ready 2 – Indicates external serial communications device is
powered, initialized, and ready. Used as hardware handshake with DTR2
for overall readiness to communicate.
RXD2
Receive Data 2 – Serial port 2 receive data in
RTS2*
Request to Send 2 – Indicates Serial port 2 is ready to transmit data. Used
as hardware handshake with CTS2 for low level flow control.
TXD2
Transmit Data 2 – Serial port 2 transmit data out
CTS2*
Clear to Send 2 – Indicates external serial communications device is ready
to receive data. Used as hardware handshake with RTS2 for low level flow
control.
DTR2*
Data Terminal Ready 2 – Indicates Serial port 2 is powered, initialized, and
ready. Used as hardware handshake with DSR2 for overall readiness to
communicate.
RI2*
Ring Indicator 2 – Indicates external serial communications device is
detecting a ring condition. Used by software to initiate operations to
answer and open the communications channel.
GND
Ground
NC
Not connected
Signal
Description
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.
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.
RXD3
Receive Data 3 – Serial port 3 receive data in
RX3-
RX3- – If in RS485 or RS422 mode, this pin is Receive Data 3 -.
RTS3*
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+
TX3+ – If in RS485 or RS422 mode, this pin is Transmit Data 3 +.
TXD3
Transmit Data 3 – Serial port 3 transmit data out
TX3-
TX3- – If in RS485 or RS422 mode, this pin is Transmit Data 3 -.
Reference Manual
Hardware
19
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