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2. Interface connector terminal assignments and signal functions
Pin Number Signal Name Signal Direction
Function
I
1
FG
-
Frame ground
2
TXD
output
Transmit data
3 RXD
Input
Receive data
6
DSR
Input
Data set ready
7 GND
-
Signal GND
20
DTR
output
Data terminal ready
3. Serial interface timing
a) Receive data
Either DTR/DSR or XON/XOFF control is selectable. Changes in DTR signal
and XON/XOFF transmission are as follows:
[DTR MARK]
l
The period from when the power is turned on to when
the printer first becomes ready to receive data.
l
In an error state.
l
When the remaining space in the receive buffer be
comes 10 bytes.
l
When feeding paper with the paper feed switch.
l In paper feed switch waiting state with <GS FF>
command.
l
In paper feed switch waiting state during macro ex-
ecution.
l
When printing down-loaded bit image with <GS />.
[DTR SPACE]
l
When the printer first becomes ready to receive data
after power-on.
l
When the remaining space in the receive buffer be
comes 20 bytes.
[XON Transmission]
l
When DTR becomes SPACE.
[XOFF Transmission]
l
When DTR becomes MARK.
b) Transmit data (Status information transmission)
When DTR/DSR control is selected, data is transmitted after confirming that
DSR is SPACE. When DTR/DSR control is not selected, data is transmitted
regardless of the DSR state.
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