Chapter 2: Specifications and System Configuration
DTM temperature controller operating manual
2.7 Initial Power on State
When the DTM has a main station collection function, it enters the initialization state after power on, and
the host will collect the setting parameters of each expansion module via the internal communications bus,
which will take approximately 30 sec. External communications interfaces (including RS485, USB, Ethernet)
will be unable to communicate at this time.
2.7.1 Light Display Status
PWR (Power): Power light (green light)→ power light [on steadily], indicates that the device is
powered up.
RUN (output Run): Control light (green light)→ control light [on steadily], indicates that control is
effective through any one channel.
COM (Communication): Communications light (green light)→ communications light [flashing],
indicates that the host is communicating.
ERR (Error): Error indicator light (red light)→
Error indicator light [flashing], indicates internal communications error; possible situations:
1. There are more than 7 measurement expansion modules
2. Measurement expansion modules of the same type have the same internal station number
3. Error in reading of measurement expansion module by the host via the internal
communications bus
Error indicator light [ON steadily], indicates that there is some other error, and the output must be
turned off; possible situations:
1. Input temperature value is unstable (any input point)
2. Sensor input line is severed or not connected (any input point)
3. Input sensor error (any input point)
4. Input hardware malfunction (any input point)
5. Memory EEPROM error
6. Input exceeds setting range (any input point)
When the error indicator light comes on, a communication method can be used to inspect the
communications content from the corresponding address to determine the error status. The
communications address and content are as shown in the following table; the bit number corresponds to
the error content, Bit0~7 = 0 = normal; Bit0~7 = 1 = abnormal (see error content in the following table):
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