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7 Communication with a PC
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7.5.4 Service Request Enable Register (SRE)
The bits of the SRE are used to select which bits of the STB shall assert an SRQ.
Bit 0, 1, 2, 3, 4, 5 and 7 of the STB are combined by logical "AND" with the according 7 bits of the
SRE. These 7 results are combined by logical "OR", so that any "hit" leads to a logical 1 in bit 6 of
the STB and asserts an SRQ.
7.5.5 Reading the STB by Detecting SRQ
If an SRQ is asserted, bit 6 of the STB is set to logical 1, so that the controller can detect by auto
serial polling, which device asserted the SRQ.
7.5.6 Reading the STB by *STB? Command
If the controller does not "listen" to SRQs at all, the service request can be detected by reading the
status byte with the command "*STB?".
If bit 6 is logical 1, a service request was asserted.
7.5.7 Reading 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.
7.5.8 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 ITC8000 modules the bits 0 to 6 and 8 are used
Bit 0 - Over temperature
ITC8000 is overheated. Wait until the module has cooled down. Maintain proper air flow.
Bit 1 - Open circuit (LD)
Laser diode circuit is open.
Bit 2 - Interlock open
The interlock has opened or the path resistance is >430 W.
Bit 3 - Current limit
The current limit is reached and the protection circuit is active now. Noise and drift specs are not
valid any more.
Bit 4 - Temperature out of window
Appropriate laser temperature (controlled by an TEC8xxx module) is out of specified window.
Bit 5 - Open circuit (TEC)
The TEC circuit is open (interrupted connection).
Bit 6 - No or wrong Sensor
A temperature sensor could not be recognized, or the type of the recognized sensor does not
match the setting of the ITC8000.
Bit 8 - Power supply error
Internal power supply error.
The DEC can be read but not set. Reading does not clear the DEC.
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