Adlink CoreModule 920 Manual de usuario descargar pdf (Pagina 32)

Chapter 3 Hardware

26 Reference Manual CoreModule 920

Table 3-4 defines the pins and corresponding signals for the Serial 2 header, which consists of 10 pins, 2

rows, odd/even sequence (1, 2), and 0.100" (2.54mm) pitch.

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

Table 3-5. Serial 2 (COM2) Interface Pin Signal Descriptions (H16)

Pin # Signal DB9

Pin #

Description

1 S2_DCD* 1 COM2 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 S2_DSR* 6 COM2 Data Set Ready – Indicates external serial device is powered,

initialized, and ready. Used as hardware handshake with DTR for overall

readiness.

3 S2_RXD 2 COM2 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 S2_RTS* 7 COM2 Request To Send – Indicates serial port is ready to transmit data.

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

5 S2_TXD 3 COM2 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 S2_CTS* 8 COM2 Clear To Send – Indicates external serial device is ready to

receive data. Used as hardware handshake with RTS for low level flow

control.

7 S2_DTR* 4 COM2 Data Terminal Ready – Indicates serial port is powered,

initialized, and ready. Used as hardware handshake with DSR for overall

readiness.

8 S2_RI* 9 COM2 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

GND 10 Ground

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Adlink CoreModule 920 Manual de usuario Pagina 32