—
— 137
RS-485 interface connector pin assignments and functions
NOTES:
❏
Receive buffer full state differs depending on the printer models. Refer to the specifications
for the printers.
❏
The data received is ignored when the space in the receive buffer is 0 byte.s
Pin number
1
FG
—
Frame ground
2
SD1
O
Transmit data
3
RD2
O
Transmit data
4
RD1
I
Receive data
5
RD2
I
Receive data
7
SG
—
Signal ground
8
2) When XON/XOFF control is selected:
This signal indicates whether the printer is correctly connected and
ready to receive data. DR1 > DR2 (READY) indicates the printer is
ready to receive data. The signal is always DR1 > DR2, except
in the following cases:
❏
During the period after the power is turned on until the printer is
ready to receive data.
❏
During the self test.
10
11
CS1
CS2
I
This signal indicates whether the host computer is BUSY or READY.
CS1 > CS2 indicates the printer is READY and CS1 < CS2 indicates the
printer is BUSY.
1) When DTR > DSR is selected:
The signal is checked and data is transmitted only when the host is
ready to receive data (READY), except for transmissions by GS ENQ,
DLE EOT, or GS a.
.
2) When XON/XOFF control is selected:
Transmits data regardless of the status of this signal.
Conditions
DIP SW Settings
ON
OFF
1. During the period from when power is turned
on (including resetting using the interface) to
when the printer is ready to receive data.
BUSY BUSY
BUSY BUSY
2. During the self-test.
3. When the cover is open.
4. During paper feeding using the paper FEED
button.
—
BUSY
—
BUSY
5. When the printer stops printing due to a
paper-end.
—
BUSY
—
BUSY
6. When an error has occurred.
7. When the receive buffer becomes full.
BUSY BUSY
Off line
Signal name
I/O
Function
When DTR/DSR is selected, this signal indicates whether the host
computer is BUSY or READY. DR1 > DR2 indicates the printer is
READY and DR1 < DR2 indicates the printer is BUSY.
The BUSY condition can be changed, depending on the off-line
conditions set by the DIP switches.
When the DTR/DSR control is selected, the printer goes into the
BUSY state (DR1 < DR2) under the following conditions:
RD1
1)
O
Summary of Contents for UP-250
Page 1: ...EXTERNAL PRINTER FEB 2000 MODEL UP 250 without price TECHNICAL MANUAL ...
Page 95: ... 86 END END Yes No Action 4 Replace main PCB Replace printer OK Action 4 mechanism assembly ...
Page 136: ... 127 ...
Page 149: ... 140 Main Circuit Board Parts Layout ...
Page 150: ... 141 RS 232 Serial Interface Circuit Board Parts Layout ...
Page 151: ... 142 IEEE 1284 Parallel Interface Circuit Board Parts Layout ...
Page 152: ...RS 485 Serial Interface Circuit Board Parts Layout 143 ...
Page 160: ... 151 Case Unit Lubrication Points Diagram 4 G 31 4 G 31 3 G 31 3 G 31 ...
Page 163: ... 154 EXPLODED DIAGRAM FOR TM U200B U210B NO 1 ...
Page 164: ... 155 EXPLODED DIAGRAM FOR TM U200B U200PB U210B U210PB NO 2 ...