Service manual

Unit 2: Interface Specifications
D508/D512 Service Manual Page 2-9
IEEE1284 PARALLEL INTERFACE
The parallel interface for this printer conforms to the IEEE1284 specification. It will automatically
detect the IEEE1284 signals and operate in the high speed mode. If it does not detect the
IEEE1284 signals, it will operate in the standard Centronics mode, which is significantly slower.
For this reason, an interface cable and host interface conforming to the IEEE1284 specification
must be present to fully utilize the speed capabilities. This interface also operates bidirectionally
and can report the status of the printer back to the host.
Electrical Specifications
Printer Connector AMP 57-40360 (DDK) or equivalent
Cable Connector AMP 57-30360 (DDK) or equivalent
Cable Length 10 ft. (3 m) or less
Signal Level High = +2.4V to +5.0V Low = 0V to -0.4V
(1)
Signals required for IEEE1284 mode
PIN SIGNAL DIRECTION PIN SIGNAL DIRECTION
1 STROBE To Printer 19 STROBE Return Reference
2 DATA 1 To Printer 20 DATA 1 Return Reference
3 DATA 2 To Printer 21 DATA 2 Return Reference
4 DATA 3 To Printer 22 DATA 3 Return Reference
5 DATA 4 To Printer 23 DATA 4 Return Reference
6 DATA 5 To Printer 24 DATA 5 Return Reference
7 DATA 6 To Printer 25 DATA 6 Return Reference
8 DATA 7 To Printer 26 DATA 7 Return Reference
9 DATA 8 To Printer 27 DATA 8 Return Reference
10 ACK To Host 28 ACK Return Reference
11 BUSY To Host 29 BUSY Return Reference
12 PTR ERROR To Host 30 PE Return Reference
13 SELECT To Host 31 INIT From Host
14 AUTOFD (1) To Host 32 FAULT To Host
15 Not Used 33 Not Used
16 Logic Gnd 34 Not Used
17 FG Frame Ground 35 Not Used
18 +5V(Z=24Kohm) To Host 36
SELECTIN
(1)
From Host