Removing Devicemaster Lt Security Features; Serial Connection Method - Comtrol DeviceMaster LT User Manual

Table of Contents

Removing DeviceMaster LT Security Features

Serial Connection

Method

DeviceMaster LT User Guide: 2000586 Rev. B

When presented with a DeviceMaster LT that has had all security options set and

the user is unaware of what the settings are, the restoring of a DeviceMaster LT

can be very difficult.

It may be necessary to use the DeviceMaster LT debug dongle provided with the

Software Developers Kit (SDK) or return the DeviceMaster LT to Comtrol after

obtaining an return material authorization (RMA) so that Comtrol can re-flash

the DeviceMaster LT with default values.

One of the following two conditions must be true, so that you can remove the

security settings from the DeviceMaster LT.

•

Serial connection using Port 1 to access RedBoot:

Bootloader timeout set to value greater than 10 seconds (default is 15

seconds).

A known good null modem cable.

A COM port on PC/Laptop.

•

Bootloader Command Console using an Ethernet connection

No password or a known password.

A known or discoverable IP address.

A utility such as Angry IP Scanner from

discover IP addresses. If the IP range is unknown, a full scan from 0.0.0.1

to 255.255.255.255 may take a long time.

An Ethernet cable.

A PC/Laptop with a telnet application installed such as PuTTY included in

PortVision DX.

Use the following procedure to set up serial connection with a terminal server

program (for example, Test Terminal (WCom2), HyperTerminal or Minicom) and

the DeviceMaster LT.

Note: Optionally, you can use Test Terminal, which is included in PortVision DX

under the Tools >Applications > Test Terminal menu.

1. Connect a null-modem cable from an available COM port on your PC to Port 1

on the DeviceMaster LT.

Note: See

Connecting Serial Devices

Page 65 to build a null-modem cable.

2. Configure the terminal server program to the following values:

•

Bits per second = 57600

•

Data bits = 8

•

Parity = None

•

Stop bits = 1

•

Flow control = None

3. Reset the DeviceMaster LT.

Note: Depending on the model, disconnect and reconnect the power cable

(external power supply and no power switch) or turn the power switch

on and then off (internal power supply).

4. Immediately type #!DM and press Enter in the

terminal program.

5. At the RedBoot> prompt, type dis, and press Enter.

Note: If you do not disable the loading feature of