Cdios 6152 Controller Commands 

This command reads/writes A/D converter and calibration values.
 

Command	Module ID	3	4	5	6	7	8
2Fh	0 - 15	Selector	Data or zero (lsb)         (msb)		0	0	0

Parameter	Value	Description	Data in Command	Data in Reply
Selector	00h 01h 02h 03h 04h 05h	Read Offset calibration value of input #1 Write Offset calibration value of input #1 Read Volt gain calibration value of  input #1 Write Volt gain calibration value of  input #1 Read mA gain calibration value of  input #1 Write mA gain calibration value of  input #1	- X - X - X	X - X - X -
	10h 11h 12h 13h 14h 15h	Read Offset calibration value of input #2 Write Offset calibration value of input #2 Read Volt gain calibration value of  input #2 Write Volt gain calibration value of  input #2 Read mA gain calibration value of  input #2 Write mA gain calibration value of  input #2	- X - X - X	X - X - X -
	20h 21h 22h 23h 24h 25h	Read Offset calibration value of input #3 Write Offset calibration value of input #3 Read Volt gain calibration value of  input #3 Write Volt gain calibration value of  input #3 Read mA gain calibration value of  input #3 Write mA gain calibration value of  input #3	- X - X - X	X - X - X -
	30h 31h 32h 33h 34h 35h	Read Offset calibration value of input #4 Write Offset calibration value of input #4 Read Volt gain calibration value of  input #4 Write Volt gain calibration value of  input #4 Read mA gain calibration value of  input #4 Write mA gain calibration value of  input #4	- X - X - X	X - X - X -
	FBh	Read self-calibrated A/D converter Offset	-	X
	FCh	Read self-calibrated A/D converter Gain	-	X
	FDh	Stop calibration measurements. After this, the 6160  has to be re-initialized because sample rate, number of channels and filter settings may have changed.	-	-
	FEh	Setup for calibration measurements: Basic sample rate set to 60Hz. Measured channels set to 4. Offsets set to zero. Gains set to one. Filters set to maximum.	-	-
	FFh	Same as FEh, but Basic sample rate = 50Hz	-	-

Normal reply is:

 

Reply	Module ID	3	4	5	6	7	8
2Fh	0 - 15	Selector (copy of command)	Data or zero (lsb)        (msb)		0	0	0

 Possible error message:

 

Error	Module ID	3	4	5	6	7	8
AFh	0 - 15	0	0	Error Status	0	0	0

Parameter	Bit	Description
Error status	0	1 = Selector parameter out of range
	1	1 = Calibration value write sequence error (data ignored)
	2	1 = FLASH EPROM programming failed

 

1. If not all 12 calibration factors are to be adjusted; first read the calibration values that are to be left unchanged and store them in the calibration table (because ALL values have to be written....).
   
2. Initialize the A/D converter with command 2Fh, Selector code FEh or FFh, to measure 4 channels at a 50 or 60Hz converter sample rate, with maximum filter setting.
   
3. Connect Gnd and Vin of every input together and connect the whole bunch to Gnd of the supply connector.
   
4. For every input to be calibrated:
   • Wait 2 seconds for the input filters to stabilize
   • Read value with a 'Read analog inputs' command (28h).
   • Store the Input value as Offset value in the calibration table.
     
5. For every Volt input to be calibrated:
   • Apply an exactly known voltage of 10V to the Volt input.
   • Wait 2 seconds for the input filters to stabilize.
   • Read value with a 'Read analog inputs' command (28h).
   • Calculate new 16 bits Volt Gain value, so that a 10V input will generate 30000 as A/D value.
     Calculation should be done with at least single precision floating point arithmetic, rounded to unsigned integer.
     
     Volt Gain value =   Input Voltage * 3000 / (Input value - Offset value) *  8000h
     
     Volt Gain value =  Input Voltage / (Input value - Offset value) *  98304000
     
     Store this Volt Gain value in the calibration table.
     
6. For every mA input to be calibrated:
   • Apply an exactly known current of 20mA to the mA input.
   • Wait 2 seconds for the input filters to stabilize.
   • Read value with a 'Read analog inputs' command (28h).
   • Calculate new 16 bits mA Gain value, so that a 20 mA input will generate 30000 as A/D value.
     Calculation should be done with at least single precision floating point arithmetic, rounded to unsigned integer.
     
     mA Gain value =   Input mA Current * 1500  / (Input value - Offset value) *  8000h
     
     mA Gain value =   Input mA Current  / (Input value - Offset) * 49152000
     
     Store this mA Gain value in the table.
     
7. Write all 12 calibration values from the table to the 6160:
   • Writing must be done in ascending order (command 2Fh, Selector codes: 01h, 03h, 15h, 11h, 13h, 15h, 21h, 23h,  25h, 31h, 33h and 35h), otherwise the 6160 will return the 'Calibration value write sequence error'.
     The data is internally buffered by the 6160 in RAM.
     
   • There must be an maximum delay of 100 mS between two write commands, otherwise the next calibration write command will return the 'Calibration value write sequence error'.
     
   • After the last write command (2Fh, Selector code 35h), the 6160 erases the calibration FLASH EPROM and writes the new values. This can take up to 500 milli-seconds before the 6160 sends a reply or error message.
     
8. Send the 'Reset 6160' Command (2Fh, Selector code FDh) to resume normal operation