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(4)
Interface connector terminal assignments and signal functions
Pin
Signal
number
name
2
RXD
3
TXD
4
DTR
5
SG
6
DSR
7
RTS
*1: Definition of "receive buffer full"
1)
When the receive buffer capacity is specified as 4 KB (Memory switch 1-2 is off):
Table 1.15.1 Signal Layout and Functions
Signal
direction
Input
Data reception
Output
Data transmission
Output
When DTR/DSR control is selected:
This signal indicates whether the printer is busy.
SPACE indicates that the printer is ready to receive data, and MARK
indicates that the printer is busy.
The printer becomes busy (MARK) under the following conditions:
Offline (1) During the period from when the
(8) When the receive buffer is full (*1)
When XON/XOFF control is selected:
The signal indicates whether the printer is correctly connected and is
ready to receive data from the host computer.
SPACE indicates that the printer is correctly connected and is ready to
receive data from the host computer. The signal is always SPACE
except in the following cases:
• During the period from when the power is turned on until the
printer is ready to receive data after mechanism initialization
• During a self-test
–
Signal ground
Input
This signal indicates whether the host computer can receive data.
SPACE indicates that the host computer can receive data, and MARK
indicates that the host computer cannot receive data. When DTR/DSR
control is selected, the printer transmits data after confirming this signal
(except when transmitting data by DLE EOT or GS a).
When XON/XOFF control is selected, the printer does not check this
signal.
Output
Same as DTR
Function
Printer status
power is turned on until the printer
is ready to receive data after
mechanism initialization
(2) During a self-test
(3) When the cover is open
(4) Feeding paper via Feed switch
(5) When the printer stops printing
due to a paper-end
(6) When waiting for a switch to be
pressed during macro execution
(7) When an error has occurred
Memory switch
1-3 status
ON
OFF
BUSY
BUSY
BUSY
BUSY
----
BUSY
----
BUSY
----
BUSY
----
BUSY
----
BUSY
BUSY
BUSY
19
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