Wiring Diagrams
7-8 11/06 FaxCentre 2121/2121L
ECP: Parallel Interface to PC
USB: USB Interface
Table 5: Parallel Interface to PC
Pin Signal Input/Output Use
1 HOSTCLK I Data clock (forward)
2 DATAECP0 I/O Data bus LSB
3 DATAECP1 I/O Data bus bit 1
4 DATAECP2 I/O Data bus bit 2
5 DATAECP3 I/O Data bus bit 2
6 DATAECP4 I/O Data bus bit 4
7 DATAECP5 I/O Data bus bit 5
8 DATAECP6 I/O Data bus bit 6
9 DATAECP7 I/O Data bus MSB
10 PRPHCLK O Data clock (reverse)
11 PRPHACK O Data acknowledgment (forward)
12 ACKRVRS O Acknowledgment of reverse request
13 XFLAG O Indicates that ECP mode is supported
14 HOSTACK I Data acknowledgment (reverse)
32 PRPHREQ O Data drive request
31 RVRSREQ I Data drive enable
36 ECPACTIVE O Mode select
18 ERREUR - Proprietary
17-19 GND - Ground
20 GND - Ground
21 GND - Ground
22 GND - Ground
23 GND - Ground
24 GND - Ground
25 GND - Ground
26-27-28-29-30 GND - Ground
15-33-34-35 - - Not Connected
Table 6: USB Interface
Pin Signal Input/Output Use
1 VBUS_USB I Supply from master
2 USBN I/O Differential pair
3 USBP I/O Differential pair
4 GND I/O Ground
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