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1-6
1. OUTLINE OF THE SYSTEM
EM10-33006A
1.5 ELECTORONICS SPECIFICATIONS
(5) Error detection
■ Parity check: VRC (Vertical parity check)
■ Framing error: This error occurs when no stop bit is found in the frame specified starting
with the start bit.
■ Overrun error: This error occurs when subsequent data is input before the data input to
the UART from the host is read by the printer.
(6) Data entry code: ASCII, 8-bit code for European characters, 8-bit code for graphic
(7) Receiving buffer: 5KB
(8) Protocol
■ XON/XOFF (DC1/DC3) protocol
• When initialized after power on, this printer becomes ready to receive data and sends
an XON code (11H). (Trasmission or non-transmission of XON code is selectable
by means of the DIP switch.)
• The printer sends an XOFF code (13H) when the blank positions in the receive buffer
becomes 800 Bytes or less.
• The printer sends an XON code (11H) when the blank positions in the receive buffer
are 2KB or more.
• When there are no blank positions in the receive buffer, the printer discards data
received which exceeds the receive buffer capacity, without storing it in the buffer.
(After detecting the XOFF code, the host computer must stop transmission before the
printer receive buffer becomes full.)
• The printer sends an XOFF code (13H) at power off time. (XOFF code send is
selectable with Dip switch.)
■ READY/BUSY (DTR) protocol
• When initialized after power on, this printer becomes ready to receive data and
converts the DTR signal to "High" level (READY).
• The printer converts the DTR signal to "Low" level (BUSY) when the blank positions
in the receive buffer amount to 800 Bytes or less.
• The printer converts the DTR signal to "High" level (READY) when the blank positions
in the receive buffer amount to 2KB or more.
• When there are no blank position in the receive buffer, the printer discards data
received which exceed the receive buffer capacity, without storing it in the buffer. (After
detecting a BUSY signal, the host computer must stop transmission before the printer
receive buffer becomes full.)
■ XON/XOFF (DC1/DC3) protocol + READY/BUSY (DTR) protocol
• When initialized after power on, this printer becomes ready to receive data and
converts the DTR signal to "High" level (READY). The printer sends an XON code
(11H).
• When the blank positions in the receive buffer are 800 Bytes or less, the printer
converts the DTR signal to "LOW" level (BUSY) and sends an XOFF code (13H).
• When the blank positions in the receive buffer are 2KB or more, the printer converts
the DTR signal to "High" level (READY) and sends an XON code (11H).
• When there are no blank positions in the receive buffer, the printer discards data
received which exceeds the receive buffer capacity, without storing it in the buffer.
(After detecting the XOFF code or BUSY signal, the host computer must stop
transmission before the printer receive buffer becomes full.)
• The printer sends an XOFF code (13H) at power off time.