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6.4 RS 232-Transparent-Mode (TransMode)
The section is only valid for the Mitsubishi Super Modem (MIM-A01).
The TransMode allows the remotecontrol of a control unit (PLC)or another RS-232 device via a
Mitsubishi SuperModem asif youwere sittingnear thedevice and connectedlocally viaRS 232.
All commands that you can give to this device via the local RS 232 interface can also be issued
via TransMode from any telephone connection or via GSM modem.
Dial-in access can be password-protected.
An application ofthe TransMode command, for example,would be the control andconfiguration
ofa technicalsystem thatis connectedto theMitsubishi SuperModem viaan RS232interface.
To use the TransMode, do the following:
ቢ
Configure the Mitsubishi Super Modem using the TransMode command
ባ
Connect your Mitsubishi Super Modem to the device you want to control remotely.
To doso youwill needa nullmodem cable(usually plug-plug),forexample,the"Blue Adapter".
ቤ
Test the remote dial-in with a Mitsubishi Super Modem or another modem using a
terminal program (dial-in of the Mitsubishi Super Modem).
ብ
The Login command for the selected Mitsubishi Super Modem must be entered
within 5 seconds
of the modem connecting (see section 6.4.3).The RS 232 is then con
-
nected to both modems.
ቦ
Control your remote device.
All data that you send from the PC to the local modem is transmitted over the telephone line to
the Mitsubishi Super Modem AT and from this modem to the connected device via RS 232.
You can operate the connected device as if you were directly sitting in front of it.
ቧ
Close the connection by
– hanging up by the caller modem
– optional timeout in the Mitsubishi Super Modem when no
more data is coming (default: 75 seconds)
6.4.1 Time delays during modem transmissions
A remote connection and data conversion in both modems lead to delays in the runtime of data
from PC to the control unitin comparison to a direct local connection via an RS 232 cable. Some
configuration programs for control units expect a response within a fewmilliseconds. Errorscan
occur in these programs. Ask the manufacturer of these programs and control units how the
timeoutfor thecommunication withthe controlunit canbe increasedto, forexample, 500ms.
RS 232-Transparent-Mode (TransMode) Configuration
6-6 MITSUBISHI ELECTRIC