US Robotics USR3500 Spezifikationen PDF herunterladen (Seite 22)

Rev 1.0 1/27/14 22

Reference Guide

Interfaces

Refer to the following table for the pin description of the 15-pin serial connector.

Table 8. Serial Connector Pin Description

Pin #

Signal

I/O

I/O Type

Reset State

Description

CT109/DCD

+/- 5.5V

Undefined

Data Carrier Detect

CT103/TXD

+/- 5.5V

Transmit Serial Data

Reserved

Do not connect

CMIC2P

Analog

Microphone positive input

CMIC2N

Analog

Microphone negative input

CT104/RXD

+/- 5.5V

Receive Serial Data

CT107/DSR

+/- 5.5V

Data Set Ready

CT108-2/DTR

+/- 5.5V

Data Terminal Ready

GND

Ground

CSPK2P

Analog

Speaker positive input

CT106/CTS

+/- 5.5V

Clear To Send

CT105/RTS

+/- 5.5V

Request To Send

CT125/RI

+/- 5.5V

Undefined

Ring Indicator

RESET

I/O

1V8

Modem Reset

CSPK2N

Analog

Speaker negative input

3.1.2.1. RS232 Serial Link Connection

Also known as the main serial link, the RS232 interface performs the voltage level

adaptation (V24/CMOS ⇔ V24/V28) between the internal modem (DCE) and

external applications (DTE).

The signals available on the RS232 serial link are as follows:

• TX data (CT103/TXD)

• RX data (CT104/RXD)

• Request To Send (CT105/RTS)

• Clear To Send (CT106/CTS)

• Data Terminal Ready (CT108-2/DTR)

• Data Set Ready (CT107/DSR)

• Data Carrier Detect (CT109/DCD)

• Ring Indicator (CT125/RI)

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 62 63

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