Fujitsu PRN608-S user manual Thermal Head Control

PRN608-S

Error processing when receiving serial data

The PRN608-S receives and checks serial data according to the transmission conditions.

When the PRN608-S has received one byte of data without errors, the data is stored in the input buffer.

If there are any errors, the following data is stored in the input buffer according to the type of error.

Error type Error code Parity error (!: 2116) Framing error (?: 3F16)

If the input data cannot be printed correctly and instead “!” or “?” is printed, the transmission conditions between the host device and the PRN608-S most likely does not match. If this happens, adjust the conditions so that they match.

2.7THERMAL HEAD CONTROL

Data Transfer to the Thermal Head

The PRN608-S transfers one dot line of data at 6 Mbps synchronized with the CLOCK signal.

The data is transferred in order to the shift register inside the thermal head from the left (when facing the paper feed direction).

The transferred data is then transferred by the head latch signal to the latch register inside the thermal head. Turning on the head strobe signal initiates printing of one dot line of data on the thermal paper.

2.7.1 Thermal Head Drive Operation

Generally, when the line thermal head is operating, the line is divided into several blocks, which are activated one after another in succession.

For the line thermal head of the FTP608 printer mechanism, the line is divided into 7 blocks called physical blocks, 216, 288 or 416 dots with each. A strobe signal (/ST1 to /ST7) is allocated to each physical block to activate it. To drive the head, physical blocks are activated in groups. The group of physical blocks is called a logical block.

For the PRN608-S either dynamic division or fixed division can be selected as the method of division for logical blocks. This selection is made through a function. See settings for more information.

2.7.2 Peak power limitation

The PRN608-S counts the number of dots activated in each physical block and groups the physical blocks into logical blocks to print a single

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