Mac Serial Interface; Serial Interface Specifications - Epson Stylus COLOR 1520 Service Manual
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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
Table 1-19. Connector Pin Assignment for Serial Interface
Pin No.
Signal Name
1
2
3
4
5
6
7
8
State
Busy
Ready
1-18
:RS-423 compliance
:Synchronous
:Approximately 900 Kbps, 1.8 Mbps
:Start bit
1 bit
:Data bit
8 bit
:Parity bit
No parity bit
:Stop bit
1 bit
:X-ON/XOFF, DTR protocol
:8-pin mini circular connector
:Apple System Peripheral-8 cable
I/O
SCLK
O
CTS
I
TxD-
O
S.G.
I
RxD-
I
TxD+
O
DTR
O
RxD+
I
8
5
2
Figure 1-9.
Serial Interface Connector Pin Assignment
Table 1-20. X-ON/X-OFF, DTR Protocol
Buffer space
Less than 1024 bytes
More than 2048 bytes
Function Description
Synchronous clock
Clear to send
Transmit data -
Signal Ground
Receive data -
Balanced Transmit +
Data terminal ready
Balanced Receive +
7
6
4
3
1
X-ON/X-OFF
Send X-OFF code
Send X-ON code
DTR
Off
On
Rev. A
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