Mac Serial Interface; Serial Interface Specifications - Epson Stylus Color 1520 Service Manual

EPSON Stylus COLOR 1520

1.3.2 Mac Serial Interface

1.3.2.1 Serial Interface Specifications

Standard
‰
Synchronization
‰
Bit Rate
‰
Word Format
‰
Handshaking
‰
Adaptable Connector
Recommended I/F Cable
Pin No.
1
2
3
4
5
6
7
8
State
Busy
Ready
1-20
RS-423 compliant
Synchronous
Approximately 900 Kbps, 1.8 Mbps
Start bit 1 bit
Data bit
Parity bit
Stop bit 1 bit
X-ON/XOFF, DTR protocol
8-pin mini circular connector
Apple System Peripheral-8 cable
Table 1-19. Connector Pin Assignment for Serial Interface
Signal Name
SCLK
CTS
TxD-
S.G.
RxD-
TxD+
DTR
RxD+
5
Serial Interface Connector Pin
Table 1-20. X-ON/X-OFF, DTR Protocol
Buffer space
Less than 1024 bytes
More than 2048 bytes
8 bits
No parity bit
I/O Function Description
O Synchronous clock
I Clear to send
O Transmit data -
I Signal ground
I Receive data -
O Balanced transmit +
O Data terminal ready
I Balanced receive +
8
7 6
4 3
1
2
Figure 1-9.
Assignments
X-ON/X-OFF
Send X-OFF code
Send X-ON code
DTR
Off
On