Atec Minolta-Cyclops52 - Manual (Page 2)

RS-232 Communication Notes
Measured temperature data is available from the digital output terminal in the form of ASCII
code, TTL level RS-232. The connector is a Hirose HR10-10P-12P. Data output is initiated by
the release of the trigger switch or external measuring request signal.
A patch cable was constructed to interface with a RS-232 port. The following connection
scheme is required to communicate with the device:
Hirose Pin 2 to RS-232 Pin 2 "Receive Data"
Hirose Pin 4 to RS-232 Pin 4 "Data Terminal Ready"
Hirose Pin 7 to RS-232 Pin 5 "Signal Ground"
Table 1 shows the communication parameters to use with the Cyclops 52.
Baud Rate 300 bps
Data Bits 7
Parity Even
Stop Bits 2.0
Flow Control None
Termination Character ASCII CR
Signal Level TTL Level ONLY
Table 1. RS-232 communication parameters.
The data output is in groups of 9 bytes. The first character is non-printing with HEX value “00”.
The second character indicates the mode of the unit. The following two characters are the ASCII
“SP”, followed by four characters that indicate the temperature. In 7-bit data mode, a working
solution for conversion to decimal numbers was accomplished by subtracting the ASCII decimal
value of the output character from 127, giving the ASCII decimal value of the number.
Example data conversion: Suppose a query to the pyrometer gives the string “<__NNLJr”, this
would indicate a value of 1135°C. The ASCII decimal value of “N” is 78, subtracted from 127
gives an ASCII decimal value 49 with corresponding character “1”. The ASCII decimal value
of “L” is 76, subtracted from 127 gives an ASCII decimal value 51 with corresponding character
“3” and so forth.
When the unit is queried and the initial reading is below 500°C, the display will illuminate but
no data is output. When the measured value is between 500-3000°C data is output over the
terminal connector, if the measurement then falls below 500°C the last measurement value over
500°C is output.
A LabVIEW program “Cyclops 52 Program” was constructed to communicate with the
instrument. This program allows for readings to be displayed and data to be saved to a .txt file.
The program also indicates when the readings are out of the calibration range of the Cyclops 52.
In the program, the small grey text display and color indicator to the right of “Degrees
Centigrade” is a status indicator for the program. As the program attempts communication with
the unit by raising and lowering the DTS line it will display “Requesting”. If there is no reading,