Wireless Temperature/Humidity Chart Recorder
8
8-9
WIRELESS RECEIVER
PC Interface: USB, 115200 baud rate, 8-bit Data, 1 Stop
bit, No Parity
Operating Environment: -18 to 49°C (0 to 120°F), 2 to 98% RH
LED indicators:
Green LED: Receive indication, blinks every time
interval
Red LED: Reflects transmitter low battery and
other communication error indications
Power: From the CTXL recorder through the
round DIN connector
Dimensions: 70 x 51 x 20 mm (2.75 x 2 x 0.8")
8.4 Error Codes
Transmitter Error Codes
The wireless transmitter uses the Red LED to provide different error information
to the user and to the wireless receiver as follows:
2 Red LED Blinks means there is an RF communication error such as Framing,
CRC, buffer overflow, etc.
3 Red LED Blinks means that the transmitter fails to communicate with the
sensor probe
4 Red LED Blinks means Low Battery indication.
The highest priority error code is 2 blinks for RF communication error. The
lowest priority error code is 4 blinks to indicate low battery. If multiple
errors occur at the same time such as bad sensor probe and low battery, the
transmitter’s red LED will blink 3 times. Only when this error clears, then the
transmitter’s red LED will blink 4 times to indicate the low battery.
The red LED error reporting occurs every 30 seconds regardless of the
transmission time interval.
Receiver Error Codes
The wireless receiver basically reflects all the error codes of the wireless
transmitter as follows:
1 Red LED Blink means No good message has been received from the
transmitter within 4 transmission time intervals (like 4 minutes for 1 minute
time interval), or 30 seconds minimum. The receiver will continue to search for
the transmitter’s message 10 more minutes before deciding that the transmitter
is either off, out of order, or out of range at which point the receiver will shut
itself off to conserve power.
If the wireless transmitter is back on line after 10 minutes, then the user needs to
un-plug the receiver from the recorder and plug it back in to reset the wireless
receiver.
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