Epson DFX-8500 Service Manual page 28

DFX-8500


Connector pin assignments:
Table 1-13. Signal and Connector Pin Assignment (Reverse channel)
Pin No. Signal Name
1 HostClk
2-9 DATA 1-8
10 PtrClk
11 PtrBusy
12 AckDataReq
13 Xflag
14 HostBusy
15 NC
16 GND
17 CHASSISGND
18 NC
19-30 GND
31 Ninit
32 NdataAvail
33 GND
34 NC
35 +5 V
36 /SLCT IN
* From the printer's point of view.
1-22
See Table 1-13 below.
I/O*
I This signal is a strobe pulse used to read extension request values
from the host computer during negotiation.
I The signals are data bits of extension request values. This printer
supports the following values:
0000 0100: Request Device ID (by nibble mode sending)
0000 0000: Request nibble mode
O Printer sending clock data.
O Printer sending data bits 3 and 7 to the host computer.
O Printer sending data bits 2 and 6 to the host computer.
O Printer sending data bits 2 and 6 to the host computer.
I This signal informs the printer of the host computer state. When
this signal is HIGH, the host computer cannot accept data.
- Not used.
- Logic ground level.
- Connected to the printer chassis. The printer chassis GND and the
signal GND are connected to each other.
- Not connected.
- Ground level for the twisted pair return signal.
I This signal is always HIGH.
O Printer sending data bits 0 and 4 to the host computer.
- Same as pins 19 to 30.
- Not used.
-
Pulled up to +5V through a 1.0 kΩ resistor.
I 1284 Active: If this signal is set to HIGH, P1284 (reverse mode) is
active.
Description