Interfaces - Epson FX-880 Service Manual

Product Description
Pin Signal
1 HostClk
2 to 9
DATA1 8
10 PtrClk
11 PtrBusy, DataBit-3,7
12 AckDataReq,
DataBit-2, 6
13 Xflag, DataBit-1, 5
14 HostBusy
31 /INIT
32 /Data Avail,
DataBit-0, 4
36 1284-Active
18 Logic-H
35 +5 V
17 Chassis
16, 33, GND
19-30
15, 34 NC
Note:
* In/Out refers to the direction of signal flow from the printer's point of view.

Interfaces

The FX-880 and FX-1180 include one built-in parallel interface card and one built-in card slot. The card
slot accepts a variety of Type-B optional interface cards, as indicated by the table below.
Catalog Number
C823051
C823071
C823141
C823151
C823572
C823452
C823121
1-18
Table 1-25. Pin Assignments for Reverse Channel
Return In/Out*
GND Pin
19 In
20 to 27 In
28 Out
29 Out
28 Out
28 Out
30 In
30 In
29 Out
30 In
Out
Out
Table 1-26. Type B Optional Interface Cards
Interface
Serial interface card
32 KB intelligent serial interface card
Coax interface card
Twinax interface card
Ethernet interface card
Parallel interface card
LocalTalk interface card
Functional Description
Host clock signal
Parallel input data to the printer
Printer clock signal
Printer busy signal and reverse channel transfer
data bit 3 or 7
Acknowledge data request signal and reverse
channel transfer data bit 2 or 6
X-flag signal and reverse channel transfer data
bit 1 or 5
Host busy signal
Not used
Data available signal and reverse channel
transfer data bit 0 or 4
1284 active signal
This line is pulled up to + 5 V through 3.3K
resistor.
This line is pulled up to +5 V through 1.0K
resistor
Chassis GND
Signal GND
Not connected
EPSON FX-880/FX-1180 Service Manual