Register description

R0: Raw ADC value

Register R0 contains the raw value of the analog/digital converter. This is the unchanged analog value prior to any scaling.

R1: Calibration value - offset

After a calibration, the offset value that was determined is entered in register R1 and used for the correction calculation.

R2: Calibration value - gain

After a calibration, the gain value that was determined is entered in register R2 and used for the correction calculation.

R6: Diagnostic register

Status byte SB1 is placed into register R6.

R7: Command register

User code word For the following commands to be executed, it is first necessary for the user code word, 0x1235, to be entered into register R31.

Command 0x7000: Restore Factory Settings

Entering 0x7000 in register R7 restores the factory settings for the following registers of both channels:

Restore Factory Settings The Restore Factory Settings command simultaneously resets both terminal channels to the delivery state, irrespective from which register it is called.

R8: Terminal description

The description of the terminal is contained in register R8.
KL3172: 0x0C64 (3172_dec)
KL3182: 0x0C6E (3182_dec)
KL3132: 0xC3C (3132_dec)
KL3162: 0xC5A (3162_dec)
KL3142: 0xC46 (3142_dec)
KL3152: 0xC50 (3152_dec)

R9: Firmware version

Register R9 contains the ASCII coding of the terminal's firmware version, e.g. 0x3141 = '1A'. The '0x31' corresponds here to the ASCII character '1', while the '0x41' represents the ASCII character 'A'.
This value can not be changed.

R12: Minimum data length of a channel

Bits 0 to 6 of the high-order byte specify the minimum number of output data in bits: 000.0000_bin = 0_dec, so 0 bytes.

Bits 0 to 6 of the low-order byte specify the minimum number of input data in bits: 001.1000_bin = 24_dec, hence 3 bytes.
The fact that bit 7 is set indicates that the control and status byte are not mandatory for the terminal function and are not transferred in compact mode.

R16: Hardware version number

Register R16 contains the hardware version of the terminal.

R17: Vendor calibration - offset

This register contains the vendor calibration offset (16 bit signed integer).

R18: Vendor calibration - gain

This register contains the vendor calibration gain (16 bit unsigned integer x 2^-16 + 1). Examples:
0x0000 means factor 1
0xFFFF means factor 2

R19: Manufacturer scaling - offset:

This register contains the offset of the manufacturer scaling. Can be activated via R32.1 in the feature register (16 bit signed integer).

R20: Manufacturer scaling - gain:

This register contains the gain of the manufacturer scaling. Can be activated via R32.1 in the feature register (16 bit unsigned integer x 2-⁸ + 1). Examples:
0x0100 means factor 1.
0x0080 means factor 0.5

R21: Upper measuring range limit

This register contains the upper measuring range limit. It can be activated by R32.8 in the feature register.

R22: Lower measuring range limit

This register contains the lower measuring range limit. It can be activated by R32.8 in the feature register.

R23: Reference calibration value: Offset

This register contains the reference value of the calibration, which is determined during the vendor calibration.

R24: Reference calibration value: Gain

This register contains the reference value of the calibration, which is determined during the vendor calibration.

R31: Code word register

• If you write values into the user registers without first entering the user code word (0x1235) into the code word register, the terminal will not accept the supplied data.
• If you write values into the user registers and have previously entered the user code word (0x1235) in the code word register, these values are stored in the RAM registers and in the SEEPROM registers and are therefore retained if the terminal is restarted.

The code word is reset if the terminal is restarted.

R32: Feature register

The feature register specifies the terminal's configuration.

Key

Fluctuating measuring signals Strongly fluctuating measuring signals can make stabilization of the calibration values impossible. In this case, skip the stabilization and disable it with bit R32.7.

*) Bit R32.14 and bit R32.15 are only available with the following firmware versions:

• KL3132, KL3152, KL3162, KL3172, KL3182: Firmware version 2B or higher
• KL3142: Firmware version 2C or higher

For lower firmware versions, bits R32.14 and R32.15 are not evaluated.
These terminals always set the error bit SB1.6 during the calibration and cannot indicate the stability error!

R33: User scaling - offset

This register contains the offset of the user scaling. The user scaling can be activated in the feature register through bit R32.0 (16 bit signed integer).

R34: User scaling - gain

This register contains the gain of the user scaling. The user scaling can be activated in the feature register through bit R32.0 (16 bit unsigned integer x 2-⁸ + 1. 1_dec corresponds to 0x0100).

R35: Limit value 1

Limit value 1 is entered in register R35. The limit value can be activated in the feature register through bit R32.9.

R36: Limit value 2

Limit value 2 is entered in register R36. The limit value can be activated in the feature register through bit R32.10.

R37: Filter constants of the A/D converter, and configuration bits for the filter

(default value: 35C0_hex)

The terminal has two low-pass filter stages:

• The first stage consists of a sinc³ filter, and is always active.
• The second stage consists of a 22nd order FIR filter. This can be deactivated.

Key

Do not change Bits R37.2 and R37.3 must always be ZERO, otherwise errors will occur in the A/D converter!

Examples

R40: Calibration interval

This register contains the calibration interval for the terminal's automatic calibration. The unit is 100 ms. The automatic calibration can be activated through bit R32.5 in the feature register.

R44: Forced calibration interval

This register contains the interval for the terminal's forced calibration. This interval is always a multiple (the default is 3_dec) of the calibration interval. (R40). The interval for forced calibration when the terminal leaves the factory is therefore 3 x 180 s = 540 s. The forced calibration can be activated through bit R32.5 in the feature register.

R47: Number of stable measured values

This register contains the number of stable measured values recorded during the calibration.

R48: Tolerance for measured value stability

This register contains the specified stable measured value tolerance.