External Control Operations; Parallel Interface; Connecting To The Lambda Dg-4/5 Parallel Port; Figure 4-1. Parallel Port Db25 Connector (Male) - Sutter Instrument Lambda DG-4 Operation Manual

4. EXTERNAL CONTROL OPERATIONS

The Lambda DG-4/5 has both serial and parallel interfaces but these two interfaces should
not be connected simultaneously. The parallel port provides you with the fastest remote
interface possible. The serial port connection provides you with a similar range of commands
but at a significantly slower speed. A serial interface therefore will not fully exploit the
Lambda DG-4/5's rapid filter changing capability. Remote control of the Lambda DG-4/5 is
similar to that of the Sutter Lambda 10 filter wheel but functional differences in these units
require the elimination of some commands and the addition of others. All of the commands
are byte (8-bit) values. This corresponds to a single character from the serial port or the value
encoded by the eight logic level input lines of the parallel port.

4.1 Parallel Interface

4.1.1 Connecting to the Lambda DG-4/5 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-4/5.
The pin assignments for this connector are, as viewed from the back of the unit:
Pin
1 Not Connected (NC)
2 Command Bit 0 (filter)
3 Command Bit 1 (filter)
4 Command Bit 2 (filter)
5 Command Bit 3 (filter)
6 Command Bit 4 (hold for trigger)
7 Command Bit 5
8 Command Bit 6
9 Command Bit 7
10 NC
11 Busy Line Output
12 NC
13 NC

Figure 4-1. Parallel port DB25 connector (male).

Table 4-1. Parallel port pin assignments.

Function
LAMBDA DG-4 & DG-5 OPERATION MANUAL – REV. 3.05C (20150414)
Pin Function
14 NC
15 NC
16 NC
17 NC
18 NC
19 NC
20 NC
21 NC
22 NC
23 NC
24 Ground
25 GROUND
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