Parallel Interface - Intermec ColorCoder V4 Service Manual

2.5 Control/Interface System, cont'd.
2.5:D Parallel Interface
Intermec ColorCoder V4 – Service Manual Ed. 1
The printer is equipped with the Centronics-conformed Parallel
interface as standard. This makes an on-line control connected with
a host computer possible. The host computer can execute the
following controls.
• Transmission of control code, special commands
• Transmission of printing data
• Start/stop of printing operation
• Transmission of variable data commands
Host computer
When the printing data are transmitted from the host computer via
the parallel interface, the signal is received by the CPU inside the
formatter PCB. If the printing data are image data, the data are
transmitted to the bit map RAM , and after transmission of the data
completes, the printing operation will start. On the other hand, the
printing data are the code data, the gate array develops the image
data in the bit map RAM in accordance with the information of the
data ( printing position, direction, character size, and character
code). When the development of the image data to the bit map RAM
completes, the printing operation starts.
Chapter 2 Operation and Timing
Gate array
Bit map RAM
CG ROM
Figure 2-56
CPU
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