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MESSTEC Power Converter GmbH
Operating Manual
TEC Controller
Document: 10100920OM
Revision: 1.1
Date: 10.10.2019
Page 34/71
7.2.3. Control Signals Digital X2
Digital control signals can be configured in a comprehensive way. The PC-
Software offers easy access to configuration of inputs and outputs. Initially, the
signal description is based on default configuration. Subsequently, alternative
configurations will be presented and explained.
Pin
Name
Function
1
CD-ENABLE
HW-ENABLE input, low-active (default configuration)
2
CD-RESET
HW-RESET input, low-active (default configuration)
3
CD-READY
Output, high-active (default configuration)
4
CD-STATUS
Output, high-active (default configuration)
5
GND
Signal GND
CD-ENABLE
– Input (X2-1)
Control Digital
– HW-ENABLE (Hardware-Enable)
Input resistance: 10 kΩ (pullup)
Digital TTL (5 V) input. High if left open.
Default configuration: low active
A low-signal or pulling HW-ENABLE to GND will start the temperature
controller and the output-power-stage. The TEC-Controller is then fully
activated and starts temperature regulation.
For safety reasons this signal is essential in any case. Even if the Enable-
Mode is set to Software by PC-Software, in this case the HW-ENABLE and
the software START-Button have to be activated. Only then, the Final-
ENABLE will be set active and start the TEC-Controller in this case.
Fig. 22: internal ENABLE signal chain
Figure 22 shows the internal logic of the ENABLE signal chain represented as
an electric circuit.
If the Enable-Mode is set to HW, the logic of the Start-Button is bypassed
(Enable-Mode switch closed). Consequence: just the HW-ENABLE activates
the Final-ENABLE.