Table 3-12. Serial Ports Pin/Signal Descriptions (J3, J9); Table 3-13. Serial 3 & 4 Interface Pins/Signals (J13, J14) - Ampro CoreModule 420 Reference Manual

Chapter 3

Table 3-12. Serial Ports Pin/Signal Descriptions (J3, J9)

Pin # Signal
1 DCD*
2 DSR*
3 RXD
RX Data –
4 RTS*
Tx Data +
5
TXD
Tx Data –
6 CTS*
Rx Data +
7 DTR*
8 RI*
9 GND
10 KEY/NC
Notes: The shaded area denotes power or ground. The signals marked with * indicate active low.
Table 3-13. Serial 3 & 4 Interface Pins/Signals (J13, J14)
Pin # Signal
1 DCD*
2 DSR*
3 RXD
34
DB9 # Description
1 Data Carrier Detect – Indicator to the serial port 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 DTR
as part of the DTR/DSR handshake.
6 Data Set Ready – Indicator to the serial port that external serial
communications device is powered, initialized, and ready. Used as
hardware handshake with DTR1 for overall readiness to communicate.
2 Receive Data – Serial port receive data input is typically held at a logic
1 (mark) when no data is being transmitted, and is held "Off" for a brief
interval after an "On" to "Off" transition on the RTS line to allow the
transmission to complete.
Serial Port 1 or 2 – If in RS485 mode, this pin is RX Data –.
7 Request To Send – Indicates serial port is ready to transmit data. Used
as hardware handshake with CTS for low level flow control.
Serial Port 1 or 2 – If in RS485 mode, this pin is TX Data +.
3
Transmit Data – Serial port transmit data output is typically held to a
logic 1 when no data is being sent. Typically, a logic 0 (On) must be
present on RTS, CTS, DSR, and DTR before data can be transmitted on
this line.
Serial Port 1 or 2 – If in RS485 mode, this pin is TX Data –.
8 Clear To Send – Indicator to the serial port that external serial
communication device is ready to receive data. Used as hardware
handshake with RTS for low level flow control.
Serial Port 1 or 2 – If in RS485 mode, this pin is RX Data +.
4 Data Terminal Ready – Indicates serial port is powered, initialized, and
ready. Used as hardware handshake with DSR for overall readiness to
communicate.
9 Ring Indicator – Indicator to serial port that external modem is detecting
a ring condition. Used by software to initiate operations to answer and
open the communications channel.
5 Digital Ground
NC Key Pin/Not connected
DB9 # Description
1 Data Carrier Detect – Indicator to serial port 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 DTR
as part of the DTR/DSR handshake.
6 Data Set Ready – Indicator to serial port that external serial
communications device is powered, initialized, and ready. Used as
hardware handshake with DTR for overall readiness to communicate.
2 Receive Data – Serial port receive data input is typically held at a logic
1 (mark) when no data is being transmitted, and is held "Off" for a brief
interval after an "On" to "Off" transition on the RTS line to allow the
transmission to complete.
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