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Chapter 3 Hardware

18 Reference Manual MiniModule SIO

Note: The shaded area denotes ground. Signals are listed in the following order: RS232 followed by

RS485/RS422. Signals marked with # indicate Active Low.

Table 3-2. Serial Port Interface Pin Signal Definitions (J7, J9, J10, and J11)

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

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 28 29 30

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