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B–12
Host I/O Interfaces
Table B–6. RS–422 Serial Interface Pin Assignments
Type of Mode
Pin Source of Data Compatible Nibble Byte
1 Host nStrobe HostClk Host/Clk
2 Host/Printer Data 1 (LSB)
3 Host/Printer Data 2
4 Host/Printer Data 3
5 Host/Printer Data 4
6 Host/Printer Data 5
7 Host/Printer Data 6
8 Host/Printer Data 7
9 Host/Printer Data 8 (MSB)
10 Printer nAck PtrClk PtrClk
11 Printer Busy PtrBusy PtrBusy
12 Printer PError AckDataReq AckDataReq
13 Printer Select Xflag Xflag
14 Host nAutoFd Host Busy Host Ack
15 Not Defined
16 Logic Grid
17 Chassis Grid
18 Printer Peripheral Logic High
19 Printer Signal Ground (nStrobe)
20 Printer Signal Ground (Data 1)
21 Printer Signal Ground (Data 2)
22 Printer Signal Ground (Data 3)
23 Printer Signal Ground (Data 4)
24 Printer Signal Ground (Data 5)
25 Printer Signal Ground (Data 6)