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70 Chapter 8 Special Features: Modem Emulation

ATDT ipaddress:tcp_port#

an example is ATDT 146.135.13.5:50001

Answering Calls

The Digi device listens on a pre-defined TCP port to receive data. When

the Digi device receives a call notification (RING) through a serial port to

begin a TCP connection, it needs to reply with an ATA or a pre-configured

Auto-Answer to answer the call.

Note: The TCP ports assigned to the serial ports are as follows:

Serial port 1 listens on TCP port 50001

Serial port 2 listens on TCP port 50002

Serial port 3 listens on TCP port 50003

Serial port 4 listens on TCP port 50004

Disconnecting Calls

The TCP connection disconnects by either dropping the DTR signal on the

serial port or sending the escape sequence <P>+++<P> to the Digi device.

<P> represents a one second pause.

Disconnecting Calls-Digi Device

The Digi device sends a NO CARRIER response to the serial port when

the network connection is dropped.

Modem Emulation AT Command Set

Command

Function

Result

Code

ATA

Answer command: The Digi device will go off hook and answer a TCP

connection request.

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Vikiqqs 04 Jan 2024 | 11:28:05

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Digi 34 Guía de usuario Pagina 70