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IM133, Page 28
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LP Corners Data - This data, sent in response to the ‘LP Corners from 13x‘, command (0x0A) is a three
item packet in the Decimal Integer String format which represents the Low Pass Filter corner frequency
(in kHz) for each channel. To convert this integer to a floating point number divide by 100. (The internal
13x representation of this data is a 4 character string with an implied decimal point after the 2nd MS digit.
This is why the division is by 100 and not 1000 used elsewhere).
Channel Error Data - This data, sent in response to the ‘Error List from 13x‘, command (0x0B) is a three
item packet in the Decimal Integer String format which represents the 13x errors on a per channel basis.
This data should be converted from the string format to an integer format (no division). The three items
are bit maps representing errors for each channel. The bit maps for each model are as follows:
Model 133
Bit 0 = 1 = EEPROM Write Error
Bit 1 = 1 = EEPROM Channel Setup Read Error
Bit 2 = 1 = EEPROM Calibration Constant Read Error
Bit 3 = 1 = Function Error
Bit 4 = 1 = Input Select Error
Model 136
Bit 0 = 1 = EEPROM Write Error
Bit 1 = 1 = EEPROM Channel Setup Read Error
Bit 2 = 1 = EEPROM Calibration Constant Read Error
Bit 3 = 1 = Function Error
Bit 4 = 1 = Auto Zero Error
Transmission Error Responses - In the event of a transmission error or data packet parameter errors one
of the following may be sent by the 13x unit.
NAK (0x0C) - This response indicates either a bad checksum was calculated or there was not enough
data transferred to satisfy the command requirements (i.e. a setup command with less that 7 items).
Bad Channel (0x0D) - This response indicates a channel number greater than 3 was received.
4.2.7.4.8.8.3
Bad Setup (0x0E) - This response indicates a Setup parameter received was out of
range.
Setup Error (0x0F) - This response indicates that when a setup was implemented it resulted in an error.
Bad Calibration Constant (0x10) - This response indicates that a calibration constant received was out of
range.
Serial Port Communication Parameters - Each unit has two parameters, Baud Rate and Address. These
parameters are accessible from the Serial Mode which is entered by holding down the right arrow key
and pressing the Function Select key (see the section on Other Modes).
Model 136 Serial Port Communication Example
ASCII String to send the Receive Unit ID command to a hypothetical Model 136, unit =20, Channel 1,
command 9 - Receive Unit ID)
276\s1\s9;132
Where;
1.
ASCII ‘276’ (50,55,54) is the result of the binary operation ((1 << 8) | 20). Where 1=Model
136 and 20 is the unit number (this binary number is then converted to an ASCII string).
