Manual

DeviceMaster LT User Guide: 2000586 Rev. B
Troubleshooting and Technical Support - 131
Removing DeviceMaster LT Security Features
Removing DeviceMaster LT Security Features
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 Com
mand 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 www.angryip.org may be used to
discover IP addresses. If the IP range is unknown, a full scan from 0.0.0.1
to 25
5.255.255.255 may take a long time.
- An Ethernet cable.
- A PC/Laptop with a telnet application in
stalled such as PuTTY included in
PortVision DX.
Serial Connection
Method
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
on Page 43Connecting Serial Devices on
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
.
No
te: 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 th
e
t
erminal program.
5. At the RedBoot> prompt, type dis, and press Enter.
Note: If you do not disable the loading feat
ure of
#!DM
RedBoot>dis
Loading disabled