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Chapter 5 Dataproducts Parallel Interface
Dataproducts Parallel Interface
The Dataproducts parallel interface allows the printer to operate with a 50-pin
Amplimite (AMP) HDH-20 data cable connector. The length of the data cable
from the host computer to the printer must not exceed 40 feet (12 meters).
Dataproducts Parallel Interface Signals
Dataproducts-compatible interface signals between the host computer and
the printer are defined as follows:
Data Lines 1 through 8. Provide eight standard or inverted levels from the
host that specify character data, plot data, or a control code. Data Line 8
allows access to the extended ASCII character set. You can enable or disable
this line via the Data Bit 8 parameter on the Dataproducts submenu (page
109).
Data Strobe. Carries a high true pulse from the host when data is ready. The
data strobe remains high until the Data Request line goes false. The active
Table 11. Dataproducts Parallel Interface Connector Pin Assignments
(with a 50-pin AMP HDH-20 Data Cable Connector)
Input Signals Output Signals Miscellaneous
Signal Pin Signal Pin Signal Pin
DATA LINE 1
Return
19
3
READY
Return
22
6
CABLE VERIFY 45, 46
DATA LINE 2
Return
20
4
ONLINE
Return
21
5
GROUND 39
DATA LINE 3
Return
1
2
DEMAND/DATA REQ.
Return
23
7
TEST 12
DATA LINE 4
Return
41
40
PARITY ERROR
Return
27
11
DATA LINE 5
Return
34
18
DATA LINE 6
Return
43
42
DATA LINE 7
Return
36
35
DATA LINE 8
Return
28
44
DATA STROBE
Return
38
37
PAPER INSTRUCTION
Return
30
14
BUFFER CLEAR
Return
31
15
NOTE: Pins not listed are not connected.