Seiko FB-900 - Manual (Page 171)

[RXD (Receive data)]
Serial input data, which consists of a start bit, data bits,
(parity bit), and stop bit.
The data length (7 or 8 bits), use of the parity bit, and
even or odd parity are specified in the EXTENDED
SETUP MODE .
[CTS (Clear to send)]
A data transmission control signal, which indicates that
data can be sent to the computer.
Whether or not to use this signal to control data
transmission is specified in the setup mode. This signal
is not used by default.
If the X-ON/X-OFF or ETX/ACK protocol is selected
and the CTS ENABLE option is set to NO in the
EXTENDED SETUP MODE , the printer outputs data to the
computer, regardless of this signal setting.
If the X-ON/X-OFF or ETX/ACK protocol is selected
and the CTS ENABLE option is set to YES in the
EXTENDED SETUP MODE , the printer outputs data to the
computer according to this signal setting.
[DSR (Data set ready)]
This signal indicates the state of the modem or computer.
If data is sent to the printer when this signal is ON, the
data is processed as valid data.
Data received when this signal is OFF is ignored as
invalid data.
By default, this signal is not used, and all data sent by the
computer is processed as valid data (i.e., the default
setting causes the same operation as when the DSR
signal is ON). Whether or not to use this signal for
control is selected in the EXTENDED SETUP MODE .
● Serial interface
7-6 — 7. Interface specifications —
See pages 3-47 and 3-48.
See page 3-50.
See page 3-51.
Input signals to the printer