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Chapter 3
Serial A Interface (J15A/B)
Table 3-8. Serial A (Serial 1) Interface Pin/Signal Descriptions (J15A)
Pin # Signal
1
DCD1* Data Carrier Detect 1 – Indicates external serial communications device is
2
RXD1
3
TXD1
4
DTR1* Data Terminal Ready 1 – Indicates Serial port 1 is powered, initialized, and ready.
5
GND
6
DSR1*
7
RTS1*
8
CTS1*
9
RI1*
Notes: The shaded area denotes power or ground. The signals marked with * = Negative true logic.
Table 3-9. Serial A (Serial 2) Interface Pin/Signal Descriptions (J15B)
Pin # Signal
1
DCD2* Data Carrier Detect 2 – Indicates external serial communications device is
2
RXD2
3
TXD2
4
DTR2* Data Terminal Ready 2 – Indicates Serial port 2 is powered, initialized, and ready.
5
GND
6
DSR2*
7
RTS2*
8
CTS2*
9
RI2*
Notes: The shaded area denotes power or ground. The signals marked with * = Negative true logic.
ReadyBoard 800
Description
detecting a carrier signal (i.e., a communication channel is currently open). In
direct connect environments, this input will be driven by DTR1 as part of the
DTR/DSR handshake.
Receive Data 1 – Serial port 1 receive data in
Transmit Data 1 – Serial port 1 transmit data out
Used as hardware handshake with DSR1 for overall readiness to communicate.
Digital Ground
Data Set Ready 1 – Indicates external serial communications device is powered,
initialized, and ready. Used as hardware handshake with DTR1 for overall
readiness to communicate.
Request To Send 1 – Indicates Serial port 1 is ready to transmit data. Used as
hardware handshake with CTS1 for low level flow control.
Clear To Send 1 – Indicates external serial communications device is ready to
receive data. Used as hardware handshake with RTS1 for low level flow control.
Ring Indicator 1 – Indicates external serial communications device is detecting a
ring condition. Used by software to initiate operations to answer and open the
communications channel.
Description
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
DTR/DSR handshake.
Receive Data 2 – Serial port 2 receive data in
Transmit Data 2 – Serial port 2 transmit data out
Used as hardware handshake with DSR2 for overall readiness to communicate.
Digital Ground
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.
Request To Send 2 – Indicates Serial port 2 is ready to transmit data. Used as
hardware handshake with CTS2 for low level flow control.
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.
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.
Reference Manual
Hardware
37
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