REV.-A
2.3.2.2
Serial Interface
Operating Principles
The two handshaking methods are as follows :
Status
flag . . .
(REV) signal
The
signal is set to SPACE
when the printer can accept data and is set to MARK (–V) when
the printer is in an error state or when the empty area in the input buffer reaches 256 bytes or less. In this
way, handshaking with the host is accomplished by setting the
signal to either SPACE or MARK.
(Refer to Figure 2-33.)
[ -v)
(
RXD
[ -v)
D a t a B i t
I
it
Start
Bit
NOTES: 1. The value of “T”
according to the input data.
2. The word structure of the serial data is :
1 start bit + 8 data bits parity (Odd, Even, or none) + 1 or more stop bits.
Figure 2-33. Handshaking with
Signal
2. X-ON/X-OFF protocol . . . Sent over the
line
Handshaking is accomplished by sending either X-ON
or X-OFF
over the
line to the host.
When the printer can accept data, the printer sends an X-ON code. When the printer becomes busy, it
sends, an X-OFF code to the host computer. “The X-OFF code is sent to the host when the empty area in
the printer input buffer reaches 256 bytes or less, or when the printer is in an error state (Refer to Figure
2-34.).
S t o p B i t
Start
Parity
.
Bit
Bit
-- --
[
[
-- --
(
--- --
“
.
[
[
’
-- --
[ -v)
S t a r t
D a t a
B i t ( X - O F F ]
NOTES : 1.
The value of “T”
according to the input data.
2. The word structure of the serial data is :
1 start bit + 8 data bits -t parity (Odd, Even, or none) 1 or more stop bits,
Figure 2-34. Handshaking with X-ON/X-OFF Protocol
2-38
Содержание LQ-1060
Страница 1: ...EPSON TERMINAL PRINTER L Q 8 6 0 1 0 6 0 TECHNICAL MANUAL ...
Страница 5: ...REVISION TABLE REVISION DATE ISSUED I CHANGE DOCUMENT I I 1st issue I v ...
Страница 68: ...cc o REV A N N n 1 cc b I al cc u co n4 2 1 Figure 2 14 Main Switching 2 21 ...
Страница 79: ...REV A Table 2 20 State of Module 1 1 I W stay E H H L H d O s H H 4 2 32 ...
Страница 203: ...Figure 5 6 MONPS MONPSE Board Voltage Waveforms 5 17 ...
Страница 204: ...REV A Fiaure 5 6 MONPS MONPSE Board Voltage Waveforms z L 5 18 ...
Страница 205: ...Figure 5 6 MONPS MONPSE Board Voltage Waveforms 5 19 ...
Страница 217: ... n 3 m I BUS CONTROL 1 LJ Pc II SYSTEM CONTROL I I L 1 I PERIPHERAL BUS IIF u lJ Figure A 2 PD78213 Block Diagram A 3 ...
Страница 248: ...REV A A 3 DRAWINGS 3 J32 J TI g 4 Figure A 27 MONPS Board Component Layout A 34 ...
Страница 249: ... J30 33r J32 d m b13 G a TI 7 IC20 r El m J24 C2 L cl mow B L U E u Figure A 28 MONPSE Board Component Layout A 35 ...
Страница 250: ... 2 1 1 1 1 I A b 2 Ozaz 1202 C O ZZH Z UOEE vu I 1 Figure A 29 MONPS Board Circuit Diagram ...
Страница 251: ...REV A 1 UXZO xl OX 9 xl Onz b 8M 118 en A N J 93 T 818 Figure A 30 MONPSE Board Circuit Diagram A 37 ...
Страница 252: ...L t g Figure A 31 JUNMM Board Component Layout A 38 ...