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PRN608-S
28-03-2003 Page 2-13 of 53
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 (!: 21
16
)
Framing error (?: 3F
16
)
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.
2.7 THERMAL 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