Reading The Stb By Serial Poll; Device Error Condition Register (Dec); Device Error Event Register (Dee); Device Error Event Enable Register (Ede) - THORLABS ITC8 Series Operation Manual

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3.4.7 Reading the STB by serial poll

If the controller does not support auto serial poll, the service request can also be
detected via manual serial poll.
If bit 6 is logical 1, a service request was asserted.

3.4.8 Device error condition register (DEC)

The bits of this register show the errors, that occur during operation (operation
errors). The bits are active high.
If the error disappears, the bits are reset to low.
For the ITC8xxx combined controller modules bits 0 to 6 and 8 are used:
(0) Over temperature
(1) Open circuit (LD)
(2) Interlock open
(3) Current limit
(4) Temperature out of window
(5) Open circuit (TEC)
(6) No or wrong sensor
(8) Power supply error
The DEC can be read but not set. Reading does not clear the DEC.

3.4.9 Device error event register (DEE)

The bits of this register hold the errors, that occurred during operation (operation
errors). So each bit of the DEC sets the according bit of the DEE.
The DEE can be read but not set. Reading clears the DEE.

3.4.10 Device error event enable register (EDE)

The bits of the EDE are used to select, which bits of the DEE shall influence bit 3
(DES) of the STB. The 8 bits of the EDE are related by logical "AND" to the according
8 bits of the DEE. These 8 results are combinedned by logical "OR", so that any "hit"
leads to a logical 1 in bit 3 (DES) of the STB. As any bit of the STB can assert an
SRQ, every error (bit of the DEE) can be used to assert an SRQ.
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© 2010 Thorlabs
Status reporting
Temperature too high. Wait until the module
has cooled down. Maintain proper air flow.
Laser diode circuit is open
The interlock has opened or path resistance
is >430 Ω.
The current limit is reached and the
protection circuit is active now. Noise and
drift specs are not valid any more.
TEC temperature is out of specified window.
TEC circuit is open.
Temperature sensor not connected or wrong
type.
Internal power supply error.
65