Service manual

Product Description
1-18
EPSON FX-880/FX-1180 Service Manual
Table 1-25. Pin Assignments for Reverse Channel
Pin Signal Return
GND Pin
In/Out* Functional Description
1 HostClk 19 In Host clock signal
2 to 9
DATA1∼8
20 to 27 In Parallel input data to the printer
10 PtrClk 28 Out Printer clock signal
11 PtrBusy, DataBit-3,7 29 Out Printer busy signal and reverse channel transfer
data bit 3 or 7
12 AckDataReq,
DataBit-2, 6
28 Out Acknowledge data request signal and reverse
channel transfer data bit 2 or 6
13 Xflag, DataBit-1, 5 28 Out X-flag signal and reverse channel transfer data
bit 1 or 5
14 HostBusy 30 In Host busy signal
31 /INIT 30 In Not used
32 /Data Avail,
DataBit-0, 4
29 Out Data available signal and reverse channel
transfer data bit 0 or 4
36 1284-Active 30 In 1284 active signal
18 Logic-H

Out
This line is pulled up to + 5 V through 3.3K Ω
resistor.
35 +5 V

Out
This line is pulled up to +5 V through 1.0K Ω
resistor
17 Chassis

Chassis GND
16, 33,
19-30
GND

Signal GND
15, 34 NC

Not connected
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.
Table 1-26. Type B Optional Interface Cards
Catalog Number Interface
C823051 Serial interface card
C823071 32 KB intelligent serial interface card
C823141 Coax interface card
C823151 Twinax interface card
C823572 Ethernet interface card
C823452 Parallel interface card
C823121 LocalTalk interface card