LAMBDA DG-4 & 5 PLUS/USB OPERATION MANUAL – REV.
46
Freeze Display
(218, DA, 11011010)
Turn Display ON
(219, DB, 11011011)
4.1
Parallel Interface
4.1.1
Connecting to the Lambda DG-4 parallel port
The parallel interface connector on the back of the cabinet is a DB-25 connector. The
connections are arranged so that a standard DB-25 cable can be used to connect the
controller to a PC parallel port. This cable should not be used simultaneously with a serial
port cable connected to the Lambda DG-4.
The pin assignments for this connector are, as viewed from the back of the unit:
Figure 4-1. Parallel port DB25 connector (male).
Table 4-7. Parallel port pin assignments.
Pin
Function
Pin
Function
1 Not Connected (NC)
14 NC
2 Command Bit 0 (filter)
15 NC
3 Command Bit 1 (filter)
16 NC
4 Command Bit 2 (filter)
17 NC
5 Command Bit 3 (filter)
18 NC
6 Command Bit 4 (hold for trigger)
19 NC
7 Command Bit 5
20 NC
8 Command Bit 6
21 NC
9 Command Bit 7
22 NC
10 NC
23 NC
11 Busy Line Output
24 Ground
12 NC
25 GROUND
13 NC
4.1.2
Input Lines
The 8 input lines of the parallel input (data input lines 2-9) are read by the controller as an 8
bit value with input line 9 corresponding to the most significant bit. When the control unit is
in the ON-LINE (remote) mode, the 8 input lines are examined at 50 microsecond intervals.
If the value of the filter or command indicated by the input lines has changed from the
previous time the lines were read, the control unit will set the BUSY line and then respond
as commanded. See the BUSY LINE section for further details about this data line.
Summary of Contents for Lambda DG-4Plus/USB
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