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e XON/XOFF (DC1/DC3) Protocol + READY/BUSY (DTR) Protocol
z When initialized after the power is turned on, this printer becomes ready to receive data
and turns the DTR signal to “High” level (READY). The printer also sends an XON code
(11H).
z When the blank positions in the receive buffer become 10 Kbytes or less, the printer turns
the DTR signal to “Low” level (BUSY) and sends an XOFF code (13H).
z When the blank positions in the receive buffer become 512 Kbytes or more, the printer
turns the DTR signal to “High” level (READY) and sends an XON code (11H).
z When there are no blank positions in the receive buffer, the printer discards data received
exceeding 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.)
z The printer sends an XOFF code (13H) when the power is off.
z The RTS signal is always “High”.
f READY/BUSY (RTS) Protocol
z When initialized after the power is turned on, this printer turns the RTS signal to “High”
(READY).
z The printer turns the RTS signal to “Low” (BUSY) when the blank positions in the receive
buffer become 10 Kbytes or less.
z The printer turns the RTS signal to “High” (READY) when the blank positions in the receive
buffer become 512 Kbytes or more.
z When there are no blank positions in the receive buffer, the printer discards data received
exceeding the receive buffer capacity, without storing it in the buffer. (After detecting the
BUSY signal, the host computer must stop transmission before the printer receive buffer
becomes full.)
z The DTR signal is always “High” (READY).
z The DSR signal from the host must always be “High”.
* When the flow control is performed with a Windows PC, “READY/BUSY (RTS) protocol”
should be selected, and “Hardware” should be selected for the flow control in the Windows
communication port setting.
NOTE: For “READY/BUSY (DTR) protocol”, data should be sent after 200 ms from when the
DTR signal is turned to “High” (READY). For “READY/BUSY (RTS) protocol”, data
should be sent after 200 ms from when the RTS signal is turned to “High” (READY).