Adlink CoreModule 435 Manual de usuario descargar pdf (Pagina 30)

Chapter 3 Hardware

24 Reference Manual CoreModule 435

For example, you must tie pin 3 (Rx Data –) to pin 5 (Tx Data –) and pin 4 (Tx Data +) to pin 6 (Rx Data +)

at Serial Port 1 or 2 (J3 or J9) for the two-wire interface. As an alternate, you may short the equivalent pins

on the DB9 connector attached to respective serial port, as shown in Figure 3-1. Refer also to the following

tables for the specific pins on the connectors. The RS-422 mode uses a four-wire interface and does not

require combining pins for its operation, but you must select RS-485 in BIOS Setup.

Figure 3-1. RS-485 Serial Port Implementation

Table 3-5 provides the signals for the corresponding pins of the two independent serial interfaces: Serial 1 &

2. Table 3-6 provides the signals for the corresponding pins of the two independent serial interfaces: Serial 3

& 4. Both interfaces use 10-pin, right-angle headers with 2 rows, odd/even sequence (1, 2), and 0.100"

(2.54mm) pitch.

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

Table 3-5. Serial Port 1 (J3) & Port 2 (J9) 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.

3RXD

Rx Data –

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 RS-485 mode, this pin is Rx Data Negative.

4RTS*

Tx 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 RS-485 mode, this pin is Tx Data Positive.

5TXD

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 RS-485 mode, this pin is Tx Data Negative.

6CTS*

Rx Data +

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

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

Serial Port 1 or 2 – If in RS-485 mode, this pin is Rx Data Positive.

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

CM435RS485jump_a

6810

Serial Ports (J3, J9)

(COM1 or COM2)

Side View

Standard DB9 Serial

Port Connector (Female)

Rear View

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