1. OUTLINE SPTM-0152
1.5 ELECTRONICS SPECIFICATIONS
1-10
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). (Transmission or non-transmission of XON code is selectable by
means of the parameter setting.)
• The printer sends an XOFF code (13H) when the free area in the receive buffer
becomes 10K Bytes or less.
• The printer sends an XON code (11H) when the free area in the receive buffer are
512KB or more.
• When there is no free area in the receive buffer, the printer discards received data
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. (Transmission or non-
transmission of XOFF code is selectable with the parameter setting.)
• The DTR signal is always “High” level (Ready).
• The RTS signal is always “High” level (Ready).
* 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 free area in the
receive buffer amount to 10K bytes or less.
• The printer converts the DTR signal to "High" level (READY) when the free area in the
receive buffer amount to 512KB or more.
• When there is no free area in the receive buffer, the printer discards received data
which exceeds 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.)
• The RTS signal is always “High” level.
* 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 free area in the receive buffer are 10K bytes or less, the printer converts the
DTR signal to "Low" level (BUSY) and sends an XOFF code (13H).
• When the free area in the receive buffer are 512KB or more, the printer converts the
DTR signal to "High" level (READY) and sends an XON code (11H).
• When there is no free area in the receive buffer, the printer discards received data
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.
• The RTS signal is always “High” level.
* READY/BUSY (RTS) Protocol
• When initialized after power on, this printer becomes ready to receive data and
converts the RTS signal to "High" level (READY).
• The printer converts the RTS signal to “Low” level (BUSY) when the free area in the
receive buffer amount to 10K bytes or less.
• The printer converts the RTS signal to “High” level (READY) when the free area in the
receive buffer amount to 512KB or more.
• When there is no free area in the receive buffer, the printer discards received data
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.)
• The DTR signal is always “High” level (READY).
• The host should keep the DSR signal “High” level.
NOTE: Be sure to select the READY/BUSY (RTS) protocol when controlling the flow
between the Windows. Also, be sure to select “Hardware” for the flow control in
the Windows communication port setting.
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