Tecfluid DFD-2 - Manual (Page 4)

2.3 Output connection
There are two types of pulse output for connecting to different types of equipment. If the clients
order does not specify differently, the equipment is supplied configured for an open collector
output. To change from open collector to TTL output, jumpers inside have to be changed (see
2.3.1 and 2.3.2).
To reach the jumpers, remove the top cover, prise open the sides of the case to release the clips
on the terminal blocks and withdraw them, sliding the whole assembly out of the case.
The jumpers are on the main board as shown in the drawing:
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2.3.1 Isolated output
Terminal 10 is the emitter of an opto-isolated NPN transistor. Terminal 9 is the collector of
this transistor. This open collector output can be used to drive electromagnetic counters or
relays. There are no protective devices on this output, such as current or over-voltage
limiting and these must be provided externally when needed. For this output mode the
jumpers JP3 and JP4 should not be in position.
Some typical connections are given as follows: