1.3.2.2 Parallel Interface(Reverse Channel)
Transmission mode IEEE-P1284 nibble mode
Adaptable connector 57-30360 (Amphenol) or equivalent
Synchronization Refer to the IEEE-P1284 Specification
Handshaking Refer to the IEEE-P1284 Specification
Signallev el TTL-compatible (IEEE-P1284level 1 device)
Data transmission timing Refer to thespecification
Table 1-33 Pin Assignmentsfor Reverse Channel
Pin
No, Signal
Name Return GND
Pin In /Out Function Description
1HostClk 19 In Host clock signal.
2DATA1 20 In Parallelinput data to the printer bit 0: LSB
3DATA2 21 In bit 1
4DATA3 22 In bit 2
5DATA4 23 In bit 3
6DATA5 24 In bit 4
7DATA6 25 In bit 5
8DATA7 26 In bit 6
9DATA8 27 In bit 7: MSB
10 PtrClk 28 Out Printer clock signal.
11 PtrBusy /
DataBit-3, 7 29 Out Printer busy signal andreverse channel transfer of data
bits 3 or7
12 AckDataReq/
DataBit-2, 6 28 Out Acknowledgedata request signal and reversechannel
transfer of data bits 2 or 6
13 Xflag /
DataBit-1, 5 28 Out X-flag signal and reversechannel transfer ofdata bits 1
or 5
14 HostBusy 30 In Host busy signal.
31 INIT 30 In Not used.
32 DataAvail /
DataBit-0, 4 29 Out Data available signal and reversechannel transfer of
data bits 0 or 4
36 1284-Active 30 In 1284 active signal.
18 Logic H —— Out This line is pulled upto + 5 V through 3.3KΩresistor.
35 +5 V —— Out This line is pulled upto +5 V through 3.3KΩresistor.
17 Chassis —— —— Chassis GND.
16, 33,
19-30 GND —— —— Signal GND.
15, 34 NC —— —— Not connected.
FX-2170 Service Manual Product Description
Rev.A 1-23