Epson Stylus Color 600 Service Manual page 26

EPSON Stylus Color 600
Following lists "Notes" when using Parallel Interface.


" Return GND pin" in the table means twist pair return and is used for all control signals except for
Logic H,+5V, Chassis, GND and NC. In this twist pair return, returning side is connected to
GND (16,33, 19-30 pin) for twist pair return. Also, these cables are shielded wires and it is
effective to connect to each chassis GND in the PC and printer for electrostatic noise.


Conditions for Interface are based on TTL level. Rise and fall time should be within 0.2 s.


Refer to the figure 1-9 for transmission timing of each signals.


Do not perform data transmission ignoring /ACK or BUSY signal. (Perform the data transmission
after confirming that /ACK and BUSY signals are Low.)


It is possible to perform the printing test including interface circuit without using equipment from
outside when 8-bit data signal(20-27 pin) is set to appropriate word code and connect them
forcefully to /ACK and /STRB.
[Data Transmission Timing for Forward Channel]
Figure 1-9. Parallel Interface Timing Chart(Forward Channel)
Parameter
Note) *: Rise and fall time of every output signals.
**: Rise and fall time of every input signals.
1-18
Table 1-14. Timing Parameters and Value
tsetup
thold
tstb
tready
tbusy
tt-out*
tt-in**
treply
tack
tnbusy
tnext
Table 1-15. Typical Time of Tack
Parallel I/F mode
High speed
Normal speed
Minimum
500ns
500ns
500ns
0
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0
500ns
0
0
Typical time of tack
2us
4us
Maximum
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500ns
120ns
200ns
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10us
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Rev. A