Data Format; Categories Of Commands / Statuses - Epson AcuLaser C8500 Service Manual

EPSON AcuLaser C8500

4.2.3.2 Data Format

The data format is defined such that the first byte is assigned to a
command or status code and the following bytes to commands and
parameter codes attached to the statuses. The number of the bytes for
the parameters is variable, and there are cases when there is no
parameter code. Each code is indicated in hex.
Example: Diagnostics (REGIST_CL) execution command.
Chapter 4 Diagnostics

4.2.3.3 Categories of Commands / Statuses

Each command and status are categorized into the following four
groups according to the type of printer control.
Paper, Media, and Output
Paper feed method (location), type of paper, paper size setting /
confirmation, paper output method (location)
Printing / Status Control
Printing control, setting an operation mode, error / status codes (the
status of the printer) confirmation.
Parameter Control
Life times, counter settings and confirmation.
Diagnostics Control
Diagnostics execution/quit, EEPROM read and write, setting the
FIRMWARE for MCU PWB.
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