US Robotics USR3500 Specifikace stáhnout pdf (Strana 21)

Rev 1.0 1/27/14 21

Reference Guide

Interfaces

3.1.1.2. ON/OFF Pin

The modem has an external ON/OFF pin which is used to turn the device ON or OFF.

The following table describes the operation of this pin.

Table 6. ON/OFF Pin Operation

Condition

State

Power Supply

Operation

Open

When 4.75V to 32V supply is

applied.

The modem is turned ON.

Pulled to GND

When 4.75V to 32V supply is

applied.

The modem remains OFF.

Left open when turning

ON the modem, then

pulled to GND

4.75V to 32V supply is initially

applied.

The modem remains ON and will

remain ON until AT+CPOF is sent to

turn the device OFF.

To enable the low power mode, the user may simply pull the ON/OFF pin to GND

and send AT+CPOF to the modem using a communication software such as a

HyperTerminal.

Table 7. ON/OFF Pin Description

Pin #

Signal

I/O

I/O Voltage

Description

ON/OFF

Pin to turn the modem ON/OFF.

Refer to the power consumption tables in section 6 Power Consumption for the

power consumption values when the modem is in Alarm mode (Low Power mode).

3.1.2. Serial Interface

A SUB-D 15-pin connector is available as a serial interface to directly communicate

with the modem. This serial interface is used for:

• RS232 serial link connection

• Audio lines connection (microphone and speaker)

• RESET signal connection

Figure 14. 15-Pin Serial Connector

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 62 63

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