Specifications
2-32 Hardware
Confidential
*1: • When the DIP switch 1-2 is Off
(
the receive buffer capacit
y
is specified to 45 b
y
tes
)
: When the remainin
g
space in the
receive buffer drops to 16 b
y
tes, the printer status becomes “buffer full,” and it remains “buffer full” until the space in the
receive buffer increases to 26 b
y
tes.
• When the DIP switch 1-2 is On
(
the receive buffer capacit
y
is specified to 4 K b
y
tes
)
: When the remainin
g
space in the
receive buffer drops to 128 b
y
tes, the printer status becomes “buffer full,” and it remains “buffer full” until the space in
the receive buffer increases to 256 b
y
tes.
• The printer i
g
nores the data received when the remainin
g
space in the receive buffer
is 0 bytes
.
See “RS-232 Serial Interface” for notes on setting DIP switch 2-1 to ON.
Interface pin assignments
Printer status and signals
Pin
number
Signal
name
Signal
direction Function
1FG—Frame ground
2 SD1 Output Transmit data
3 SD2 Output Transmit data
4RD1InputReceive data
5RD2InputReceive data
7 SG — Signal ground
8 DR1 Output When DTR/DRS is selected, this signal indicates whether the host computer is BUSY or
READY.
9 DR2 Output 1) DR1>DR2 indicates that the printer is READY and DR1<DR2 indicates that the
printer is BUSY. The BUSY condition can be changed, depending on the offline
conditions set by the DIP switches.
When the DTR/DSR control is selected, the printer enters the BUSY state
(DR1<DR2) under the following conditions.
DIP SW 2-1 status
Printer status ON OFF
1. During the period from when the power is
turned on (including resetting using the
interface) to when the printer is ready to
receive data.
BUSY BUSY
2. During the self-test. BUSY BUSY
3. When the cover is open. — BUSY
4. During paper feeding using the paper FEED
switch.
—BUSY
5. When the printer stops printing due to a
paper-end (only when the paper roll is not
present).
—BUSY
6. During macro executing standby status. — BUSY
7. When an error has occurred. BUSY
8. When the receive buffer becomes full. (*1) BUSY BUSY