eDAQ PowerChrom 280, User Manual

Page: 12 / 38

8 PowerChrom
Digital Output Controls
The Instrument Connection Port also provides four independent digital
output controls. These outputs can be used to control external devices
using the PowerChrom software (via Method tables). The digital outputs
can provide logic levels (5 V TTL) or contact closures (depending on the
link settings) and are therefore suitable for use with a wide range of
external devices. PowerChrom software can be used to set:
• a contact closure to be open or closed;
• a logic voltage to be high or low; or
• pulse a logic voltage from one state to the other for a brief time
(from 16 to 32 ms, depending on internal timing).
Technical details of the digital input and output connectors are given
later in this manual: please refer to the descriptions before attempting to
connect equipment to them. The digital output connections (positive and
negative) are marked ‘CTL1’ to ‘CTL4’ (for control).
More information on the use of the digital outputs is given in the
PowerChrom Software Manual .
Links
A set of four links are present at the right of the Instrument Connection
Port,
Figure 1–3 , one for each of CTL1, CTL2, CTL3 and CTL4. When
the links are present the Digital Output Controls, page 8 , are
configured as TTL. Remove the links using tweezers, or by levering them
out with a small screwdriver, to configure the Digital Outputs as contact
closures.