Serial Interface - Epson Stylus Photo Service Manual

Chapter 1 Product Description

1.3.3 Serial Interface

[Standard]
[Synchronization]
[Bit rate]
[Word format]
[Handshaking]
[Adaptable Connector]
[Recommended interface cable]
Following table shows connector pin assignment and signals:
Pin No.
1
2
3
4
5
6
7
8
Note) In/out refer to the direction of signal flow as viewed from the printer.
Following figure shows port arrangement of serial I/F connector.
Following table shows timing relation of DTR, X-on/X-off handshaking.
State
Busy
Ready
1-18
: based on RS-423
: Synchronous
: Approx. 900Kbps
: Start bit
: Data bit
: Parity bit
: Stop bit
: X-ON/X-OFF, DTR protocol
: 8-pin mini circular connector
: Apple System Peripheral-8 cable
Table 1-15. Connector Pin Assignment and Signals
Signal Name
SCLK
CTS
TxD-
S.G.
RxD-
TxD+
DTR
RxD+
Figure 1-10. Serial I/F Connector Port
Table 1-16. DTR, X-ON/X-OFF Protocol
Buffer Space
Less than 3072 bytes
More than 5120 bytes
1 bit
8 bit
none
1 bit
In/On Function Description
Out
In
Out
In
In
Out Balanced Transmit+
Out
In
X-ON/X-OFF
Send X-OFF code
Send X-ON code
Synchronous clock
Clear to send
Transmit data-
Signal ground
Receive data-
Data terminal ready
Balanced Receive+
DTR
Off
On
Rev.A