(2) mode of communication: full duplex
(3) transmission speed: 2400 bps
4800 bps
9600 bps
19200 bps
(4) synchronization method: start-stop synchronization
(5) start bit: 1 bit
(6) stop bit: 1 bit
2 bits
(7) data length: 7 bits
8 bits
(8) parity: none
even
odd
(9) error detection: parity error vertical parity error check
framing error this error occurs if no stop bit is found in the frame
specified starting with the start bit.
overrun error this error occurs if the next data is input before the
data input to the uart from the host is read by the
printer cpu.
(10) protocol: no-procedure method
(11) data input code: ascii code
european character set 8 bit code
graphics 8 bit code
jis 8 code (for the ja model only)
shift jis kanji code (for the ja model only)
jis kanji code (for the ja model only)
(12) receive buffer: 5k bytes
(13) transmission control: xon/xoff (dc1/dc3) protocol
ready/busy (dtr) protocol
xon/xoff (dc1/dc3) protocol + ready/busy (dtr) protocol
ready/busy (rts) protocol
① 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 dip switch.)
the printer sends an xoff code (13h) when the blank positions in the receive buffer become 800 bytes or less.
the printer sends an xon code (11h) when the blank positions in the receive buffer are 2k bytes or more.
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, the host computer must stop transmission before the printer receive buffer becomes full.)
the printer sends an xoff code (13h) when the power is off. (transmission or nontransmission of the xoff code is selectable by means of the dip switch.)
② ready/busy (dtr) protocol
when initialized after power on, this printer becomes ready to receive data and turns the dtr signal to “high” level (ready).
the printer turns the dtr signal to “low” level (busy) when the blank positions in the receive buffer are 800 bytes or less.
the printer turns the dtr signal to “high” level (ready) when the blank positions in the receive buffer are 2k bytes or more.
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.)
③ xon/xoff (dc1/dc3) protocol + ready/busy (dtr) protocol
when initialized after power on, this printer becomes ready to receive data and turns the dtr signal to “high” level (ready). it also sends an xon code (11h).
when the blank positions in the receive buffer are 800 bytes or less, the printer turns the dtr signal to “low” level (busy) and sends an xoff code (13h).
when the blank positions in the receive buffer are 2k bytes or more, the printer turns 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 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.)
the printer sends an xoff code (13h) when the power is off.
in ready/busy (dtr) protocol, data should be sent 200 ms or later after the dtr signal becomes “high” level (ready) when the printer is turned on.
④ ready/busy (rts) protocol
when initialized after the power is turned on, this printer becomes ready to receive data and turns the rts signal to “high” (ready).
the printer turns the rts signal to “low” (busy) when the blank positions in the receive buffer are 800 bytes or less.
the printer turns the rts signal to “high” (ready) when the blank positions in the receive buffer are 2k bytes or more.
when there are no blank positions in the receive buffer, the printer discards data received that exceeds 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.)
the printer must always turn the dtr signal to “high”. the host must always turn the dsr signal to “high”.
* when the flow control is performed in windows, the rts/busy (rts) protocol should be selected. at the time, “hardware” should be selected for the flow control in the communication port setting in windows.
1. in ready/busy (dtr) protocol, data should be sent 200 ms or later after the dtr signal becomes “high” (ready) when the printer is turned on.
2. in ready/busy (rts) protocol, data should be sent 200 ms or later after the rts signal becomes “high” (ready) when the printer is turned on.
(14) input/output signals
(15) connector pin assignment and signal description
(16) interface circuit
input circuit
output circuit
signal levels
