Mitsubishi Electronics UD8900U, UD8850U Execution procedure of RS-232C commands via LAN, Prv=Erra

4. Execution procedure of RS-232C commands via LAN

•When you use the LAN function, set the STANDBY MODE to STANDARD or LAN.

•When you execute RS-232C commands via LAN, check that the CONTROL SYSTEM in the NETWORK menu is set to STANDARD.

•You can change the certification password using the NETWORK PASSWORD in the NETWORK menu. The default password is “admin.”

•You can skip the certification process by setting the NETWORK CERTIFICATION in the NETWORK menu to OFF. When you skip the certification process, Steps 2 to 4 described below can be skipped and you can send RS-232C commands without adding a certification data.

Example:

Sending the PON command (00!) while the NETWORK CERTIFICATION is set to OFF

00!

For the procedure to set the menu, refer to the User Manual supplied with the projector.

To execute the RS-232C command via LAN while the NETWORK CERTIFICATION is set to ON, a 32-byte connection certification data must be added before the RS-232C command.

To create a 32-byte certification data, following information and procedure are required.

•Random character string for creating the certification data that is acquired from the projector (8 characters)

•Network password of the projector (1 to 32 characters)

•MD5 hash calculation

•Based on the above, the execution procedures to connect to the projector and send the RS-232C commands while the NETWORK CERTIFICATION is set to ON are described below.

1. Connect to Port 63007 of the projector from the PC as a TCP/IP client.

2. After completing the connection, send the acquisition request for the certification data (“$AK	”) (ASCII
code: 24 41 4B 0D) from the PC to the projector.

3.Acquire “$AK******** ” on the PC as the response of the request sent in Step 2. (********: Random character string for creating the certification data)

4.Create the certification data on the PC.

•Create the key of the certification data by linking the data acquired in Step 3 with the network charac- ter string.

For example, when the random character string is 12345678 and the password is ABCD, the key of the certification data is 12345678ABCD (character string in ASCII code).

•Run MD5 hash on the key of the certification data.

•Create the certification data by converting the hash-calculated 16-byte data into the ASCII code char- acter string.

Example:

Calculation result: [4f][3c][5d][a1][7b][4f][b5][ed][2c][99][4e][bb][f6][57][67][54] (hexadecimal numeral)

Certification data: 4f 3c 5d a1 7b 4f b5 ed 2c 99 4e bb f6 57 67 54 (character string in ASCII code)

5.Send the RS-232C command with the certification data from the PC to the projector. Example:

To send the PON command (00! ) using the certification data created in Step 4:

4f3c5da17b4fb5ed2c994ebbf657675400!

6.Receive the response from the projector on the PC. Response data has the following patterns.

Normal: 00! (Parameter is added depending on the command.)

Error in the certification data: Command error: 00!:N

PRV=ERRA

PC

Projector

1. Connection

2. Acquisition request of the certification data

3. Receiving of the certification data

4. Creation of the certification data

5. Sending of the RS-232C command

6. Receiving of the response data

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