Ampro Corporation Single Board Computer 700 - Manual (Page 46)

Chapter 3 Hardware
40 Reference Manual ReadyBoard 700
Serial A Interface (J5A/B)
Table 3-12. Serial A (Serial 1) Interface Pin/Signal Descriptions (J5A)
Pin # Signal Description
1 DCD1* Data Carrier Detect 1 – 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 DTR1 as part of the
DTR/DSR handshake.
2 RXD1 Receive Data 1 – Serial port 1 receive data in
3 TXD1 Transmit Data 1 – Serial port 1 transmit data out
4 DTR1* Data Terminal Ready 1 – Indicates Serial port 1 is powered, initialized, and ready.
Used as hardware handshake with DSR1 for overall readiness to communicate.
5 GND Digital Ground
6 DSR1* 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.
7 RTS1* Request To Send 1 – Indicates Serial port 1 is ready to transmit data. Used as
hardware handshake with CTS1 for low level flow control.
8 CTS1* 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.
9 RI1* 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.
Notes: The shaded area denotes power or ground. The signals marked with * = Negative true logic.
Table 3-13. Serial A (Serial 2) Interface Pin/Signal Descriptions (J5B)
Pin # Signal Description
1 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
DTR/DSR handshake.
2 RXD2 Receive Data 2 – Serial port 2 receive data in
3 TXD2 Transmit Data 2 – Serial port 2 transmit data out
4 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.
5 GND Digital Ground
6 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.
7 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.
8 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.
9 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.
Notes: The shaded area denotes power or ground. The signals marked with * = Negative true logic.