Adlink CoreModule 435 Manual de usuario descargar pdf (Pagina 31)

Chapter 3 Hardware

CoreModule 435 Reference Manual 25

Note: The shaded table cells denote power or ground. The * symbol indicates the signal is Active Low.

Table 3-6. Serial Port 3 (J14) & Port 4 (J13) Interface Pin Signals

Pin # Signal DB9 # Description

1 DCD* 1 Data Carrier Detect – Indicates external serial device is detecting a

carrier signal (i.e., a communication channel is currently open). In direct

connect environments, this input is driven by DTR as part of the DTR/

DSR handshake.

2 DSR* 6 Data Set Ready – Indicates external serial device is powered, initialized,

and ready. Used as hardware handshake with DTR for overall readiness.

3 RXD 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.

4 RTS* 7 Request To Send – Indicates serial port is ready to transmit data. Used as

hardware handshake with CTS for low level flow control.

5 TXD 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.

6 CTS* 8 Clear To Send – Indicates external serial device is ready to receive data.

Used as hardware handshake with RTS for low level flow control.

7 DTR* 4 Data Terminal Ready – Indicates serial port is powered, initialized, and

ready. Used as hardware handshake with DSR for overall readiness.

8 RI* 9 Ring Indicator – Indicates external serial device is detecting a ring

condition. Used by software to initiate operations to answer and open the

communications channel.

GND 5 Ground

10 Key/NC NC Key Pin – Not connected

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Adlink CoreModule 435 Manual de usuario Pagina 31