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Chapter 7 – Modem (Transparent) Mode

Command Line Interface and Application Examples for Multi-Tech Systems, Inc. IP Modules (S000368F) 90

Scenario 3 – Transparent Mode by Bypassing

Network Processor

This scenario is for wireless modems only!

Transparent mode by bypassing the Network Processor. (applicable only for wireless modems).

In this scenario, raw data is communicated between serial ports at hardware level. The option to perform transparent

mode with bypassing the processor is controlled with configuration command.

In this scenario, once the physical link is up on the built-in modem interface; i.e., by dialing or answering, the serial

device connected to the RS-232 interface (S0 of the target) can communicate to the device on the built-in modem

interface (S1 of the target) and vice-versa. The communication between ports is performed at the hardware level.

IP Module as a Modem

In this scenario, the hardware provides a transparent mode which is used to bypass the Network processor. A

configuration command is used to select the function that will perform the transparent mode via the processor. Even

in the bypass-processor case, the processor still receives data from the serial side and detects the escape sequence

that will switch to command mode.

Since its bypassing the Network processor, in this case there is no buffer support to store data.

Commands for the Scenario

# set operation-mode modem-bypass

# set serial s0 escape-monitor enable

# set serial s0 escape-string "+++inets0"

# set serial s0 stop-bits 1

# set serial s0 baud-rate 115200

# set serial s0 data-bits 8

# set serial s0 parity none

# set serial s0 flow-control rts-cts

# set serial s1 stop-bits 1

# set serial s1 baud-rate 115200

# set serial s1 data-bits 8

# set serial s1 parity none

# set serial s1 flow-control rts-cts

# save

Notes:

• You can switch from Data mode to Command mode using the escape-monitor-string configuration. The

control is transferred to the command prompt. Either “Login” or the command shell is prompted depending

on the configuration.

• You can switch from Command mode to Data mode using the restore session command.

• The data session is dropped if the physical link goes down.

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Multitech MultiConnect Adapter Uživatelská příručka Strana 90