LAMBDA DG-4 & 5 PLUS/USB OPERATION MANUAL – REV.
49
port, and the third to a 5 bit input/output port. The first two ports are used in our example.
The address of the first (output) port, which is the base address, should be one of three
possible values, depending on the individual system.
If the printer adapter is located on a display adapter, it will be called LPT 1 and will have a
base address of 956 (3BC H). If there is no active printer adapter on a display adapter card,
the primary printer adapter card will be called LPT1 and will have a base address of 888 (378
H). A second printer adapter card in the same system will be called LPT2 and will have a
base address of 632 (278 H). Check the documentation of your system and the jumpers on the
various adapter cards to be sure of the base address on the adapter you wish to use.
The connections to the parallel port are made through a DB 25 connector on your computer.
The pin assignments for the computer parallel port connector are, as viewed from the plug
side:
Figure 4-2. DB25 Parallel connector.
Table 4-9. Parallel port pin connections and definitions.
REMOTE PC PARALLEL PORT
LAMBDA DG-4 CONTROLLER
Pin #
Pin Description
Pin #
Pin Description
1
STROBE
1
NC (Not Connected)
2
Data Bit 0
2
Filter or Command Bit 0
3
Data Bit 1
3
Filter or Command Bit 1
4
Data Bit 2
4
Filter or Command Bit 2
5
Data Bit 3
5
Filter or Command Bit 3
6
Data Bit 4
6
Command Bit 4
7
Data Bit 5
7
Command Bit 5
8
Data Bit 6
8
Command Bit 6
9
Data Bit 7
9
Command Bit 7
10
ACK
10
NC
11
BUSY
11
BUSY LINE OUTPUT
12
PE
12
NC
13
SELECT
13
NC
14
AUTOFEED
14
NC
15
ERROR
15
NC
16
INIT
16
NC
17
SELECT IN
17
NC
18
GROUND
18
NC
19
GROUND
19
NC
20
GROUND
20
NC
21
GROUND
21
NC
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