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switches. However, the hardware error code (a) has the same
conditions as those for parallel input.
When transferring data, data control by SBUSY and Xon/Xoff is not
executed and the data is transferred with no conditions.
All of the transmission conditions of serial data transfer for sending
hardware error codes are fixed at the selection of parallel input as
follows:
Serial data output (TxD)
When Xon/Xoff control is selected, the Xon/Xoff signal is output.
Data is output according to the transmission conditions, which are
set by the function switches.
All response data is output.
Serial data input (RxD)
Data input port
Data is input from the host device according to the transmission
conditions, which are set using the function switches.
Serial busy (SBUSY)
Indicates whether or not the PRN604-S is ready to receive data.
When the SBUSY signal is low, data can be input.
When Xon/Xoff control is selected, SBUSY is always low.
2.6.2 Setting functions
Error processing when receiving serial data
The PRN604-S receives and checks serial data according to the
transmission conditions.
When the PRN604-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
PRN604-S most likely does not match. If this happens, adjust the
conditions so that they match.
12-02-2003
Page 2-13 of
51
2.6.1.1 Serial input/output port
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