Serial Interfacespecifications - Epson LX-300 Service Manual

LX-3(IO Service Manual
1.3.2 Serial Interface Specifkations
The LX-300 is equipped with an 8-bit serial interface, standard.
Data format:
Synchronization:
Handshaking:
State
Busy
Ready
State
Busy
Ready
Word length
Start bits:
Data bits:
Parity bit:
Stop bits:
Bit rate:
Logic level
MARK (logical 1):
SPACE (logical O):
Parity check:
Connector:
Table 1-16. Signal and Connector Pin Assignments for Serial Interface
Pin No. Signal Name
FG
2
3
4
5
7 SG
11,20
6,8-10,12-
NC
19,21-25
The //0 column irxbtes the djrectkm d the sjgnal as vjewed from the printec
Rev. A
Asynchronous
By DTR signal and X-ON/X-OFF protocol
Buffer Space
Less than 256 bytes
More than 512 bytes
Buffer Spaoe
Less than 256 bytes
256 bytes or more
1 bit
7 or 8 bit (selectable)
O or 1 bit (selectable)
1 bit or more (receiving)
300, 6(X), 1200,2400,4800,9600, 19200 bps (selectable)
–3 V to –25 V
to +-25
v v
Odd, even, or no parity bit (selectable)
110*
—
Chassis ground.
Transmit seriil data.
out
In Receive serial data.
This signal is always at the positive EIA level.
out
In
Ignored.
—
Return path for data and control signals.
This signal is at the positive EIA level when the printer is
ready to accept data entry and at the negative EIA level
out
when the printer is not ready to accep t data entry.
—
No connection (not used).
Product Description
off X-OFF
On X-ON
Response Code
NAK
ACK
Description
1-13