EPSON Stylus Color 440/640/740 Revision A
Chapter 1 Product Description 31
1.3.3 Serial Interface (for Stylus Color 640, 740)
[Standard] Based on RS-423
[Synchronization] Synchronous
[Bit Rate] Approx.1800Kbps
[Handshaking] X-ON/X-OFF, DTR Protocol
[Word Format] Data Bit= 8 bits
Parity Bit= None
Start Bit= 1 bit
Stop Bit= 1 bit
[Connector] 8-pin mini-circular connector
[Recommended Cable]Apple System Peripheral-8 Cable
Table 1-16. Pin Assignment
Table 1-17. X-On/X-Off and DTR Status
1.3.3.1 USB Interface (Only for Stylus Color 740)
[Standard] Universal Serial Bus Specifications Rev. 1.0
Universal Serial Bus Device Class Definition
for Printing Device Version 1.0
[Bit Rate] 12 M bps
[Data Encoding] NRZI
[Connector] USB Series B
[Recommended Cable Length] 2 meters
Table 1-18. Pin Assignment
Figure 1-10. USB Pin Assignment
Pin No. Signal Name I/O Description
1 SCLK O Synchronous clock signal
2 CTS I Clear To Send
3 TXD- O Transmit Data (-)
4 SG I (Signal Ground)
5 RXD- I Receive Data (-)
6 TXD+ O Balanced Transmit Data (+)
7 DTR O Data Terminal Ready
8 RXD+ I Balanced Receive Data (+)
State Buffer Space X-ON/X-OFF DTR
Busy Less than 3072 bytes Send X-OFF code OFF
Ready More than 5120 bytes Send X-ON code ON
Pin No. Signal Name I/O Description
1 Vcc ----
Cable power, Maxi. power consumption
is 100 mA
2 -Data Bi-D Data
3 +Data Bi-D
Data, pull up to +3.3 V via 1.5 K ohms
resistor
4 Ground ---- Cable Ground
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