Service manual

EPSON Stylus COLOR 1520
Rev. A
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8
1.3.2 Mac Serial Interface
1.3.2.1 Serial Interface Specifications
Standard :RS-423 compliance
Synchronization :Synchronous
Bit rate :Approximately 900 Kbps, 1.8 Mbps
Word format :Start bit 1 bit
:Data bit 8 bit
:Parity bit No parity bit
:Stop bit 1 bit
Handshaking :X-ON/XOFF, DTR protocol
Adaptable connector :8-pin mini circular connector
Recommended I/F cable :Apple System Peripheral-8 cable
Pin No. Signal Name I/O Function Description
1 SCLK O Synchronous clock
2 CTS I Clear to send
3 TxD- O Transmit data -
4 S.G. I Signal Ground
5 RxD- I Receive data -
6 TxD+ O Balanced Transmit +
7 DTR O Data terminal ready
8 RxD+ I Balanced Receive +
State Buffer space X-ON/X-OFF DTR
Busy Less than 1024 bytes Send X-OFF code Off
Ready More than 2048 bytes Send X-ON code On
Table 0-19. Connector Pin Assignment for Serial Interface
1
2
34
5
6
7
8
Figure 0-9.
Serial Interface Connector Pin Assignment
Table 0-20. X-ON/X-OFF, DTR Protocol