Epson EMP-7600 User Manual download pdf (Page 5)

ESC/VP Level 6 Serial Communication Manual (Abridged Edition)

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5. COMMAND STRUCTURE

• ECommands are expressed as hexadecimal codes.

• All commands start with an ID code and end with a checksum.

When an ESC/VP command which is sent from the computer is received by the projector, a reply is returned.

However, the replies which are returned by the projector only indicate whether the initial command was received by the projector,

and do not indicate whether the command was executed or not.

Acquisition commands are sent in order to check the execution of a command.

In addition, if the next command is sent before the reply to a previous command has been received from the projector, it may

result in a communication error.

The command structure is shown below.

* The maximum length for a command is 1024

bytes.

* Command layout is BigEndian.

(1) STX

: 0x1D (1 byte)

(2) Size

: Size of a command packet (Specifies a number of the data from 1D to CS) (2 bytes)

Example) To turn the power on over a serial connection

Example) To check the power status over a serial connection

(3) Attribute

: Indicates attributes such as apply command/reply command, OK/Not OK, etc. (1 byte)

The attribute codes are shown below.

(1) STX

(2) Size (3) Attribute (4) FromTo (5) Group (6) Item (7) Parameter (8) Check Sum

Table 5-1. Attribute of the Apply command

Attribute Attribute code Caption

Set 0x01 Sets, reports and indicates values.

Get

0x02 Gets the current value.

Initialize

0x03 Initializes a value.

Package

0x05 Command which combines the attributes of setting, reporting, indicating and requesting.

Table 5-2. Attribute of the Reply command

Attribute Attribute code Caption

Return Packet for setting (OK) 0x81 Indicates that the set command received was analyzed correctly.

Return Packet for setting (NG)

0xC1 Indicates that the set command received was not analyzed correctly.

Return Packet for getting (OK)

0x82 Indicates that the get command received was analyzed correctly.

Return Packet for getting (NG)

0xC2 Indicates that the get command received was not analyzed correctly.

Return Packet for initializing (OK)

0x83 Indicates that the initialize command received was analyzed correctly.

Return Packet for initializing (NG)

0xC3 Indicates that the initialize command received was not analyzed correctly.

Response to package (OK)

0x85 Indicates that the combined attribute command received has been parsed correctly.

Response to package (not OK)

0xC5

Indicates that the combined attribute command received has not been parsed cor-

rectly.

Alert response to commands

0x8F

Indicates that the command received contained an error and could not be parsed cor-

rectly.

1D 000x 01 01 00 03 01 CS

---> 0x0009

1D 000x 02 01 00 03 01 CS

---> 0x0008

1 2 3 4 5 6 7 8 9 10 ... 19 20

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Epson EMP-7600 User Manual Page 5

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