Digital Load Cell Command Set and Specifications
ALCP Advanced load cell protocol Digital Load Cell Project Ver. 3.7
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RS485 Communications parameters. 19,200 baud Default38.4K baud selectable57.6K baud selectable96K baud selectable115.2K baud selectable 8 data bits no parity bit 2 stop bits Total of 10 bits per byte |
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Digital load cell command set
aa = Two byte hexadecimal address (01 to FF)
dd = Data (integer decimal values).
cr = Carriage Return character.
If = Line Feed character. Sample ratesLoad sample rate is 60 samples/secTemp sample rate is 20 samples/sec Excitation5VAC square wave 600 Hz |
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| Respond | ||
| Command | Response | Description |
| aaRcrlf | aaD+/-ddlf |
Respond
with Temperature compensated (if Mode = 0),
calibrated data +/-400,000 nominal, +/-524,288 max
aa = 00 will have all load cells take a reading at the same time and then respond in sequence, separated by a If. |
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| Set (aa = 00 will work but will not give response) | ||||
| Command | Response | Description | ||
| aaSAaacrlf | aa,OKlf | Set Address (aa = 00 is not available) | ||
| aaSNddcrlf | aaVNddlf | Set Number of temp samples averaged(1-30,000)(set = 2,400)(2 min) | ||
| aaSRddcrlf | aaVRddlf | Set Response byte count delay before transmission. (1-100)(factory set = 10) Allows time for indicator to switch from transmit to receive mode and not miss any data from first load cell. | ||
| Tell (aa = 00 is not available) | ||||
| Command | Response | Description | ||
| aaTUcrlf | aaVUddlf | Tell Uncompensated & uncalibrated load data. aa= 00 will have all load cells take a reading at the same time and then respond in sequence, separated by a If. | ||
| aaTTcrlf | aaVTddlf | Tell temperature in Deg C x 100. | ||
| aaTCcrlf | aaVCddlf | Tell raw temperature data counts | ||
| aaTNcrlf | aaVNddlf | Tell Number of temp samples averaged(1-30,000)(factory set = 2,400)(2 min) | ||
| aaTMcrlf | aaVMddlf | Tell Mode (0 = temp compensated, 1 = Not temperature compensated). | ||
| aaTGcrlf | aaVGddlf | Tell Gain of pga in Crystal ADC (1,2,4,8)(factory set = 2) | ||
| aaTVcrlf | aaVVddlf | Tell Version of software. 3.7 | ||
| aaTRcrlf | aaVRddlf | Tell Response byte count delay before transmission. (1 - 100)(factory set = 10) | ||
| Baud Rates | ||||
| After baud rate is changed the unit must be powered down and then restarted to have the new baud rate in effect. | ||||
| aaSB0 | aa,OKIf | Set baud rate to 19,200 baud. Factory set to 19,200 baud | ||
| aaSB1 | aa,OKIf | Set baud rate to 38,400 baud | ||
| aaSB2 | aa,OKIf | Set baud rate to 57,600 baud | ||
| aaSB3 | aa,OKIf | Set baud rate to 96,000 baud | ||
| aaSB4 | aa,OKIf | Set baud rate to 115,200 baud | ||
| Set Smart Filters | ||||
| Command | Response | Description | ||
| aaSFddcrlf | aaVFddlf | Set number of load samples averaged in High filter (1-30,000) (Factory set = 100) | ||
| aaSJddcrlf | aaVJddlf | Set number of load samples averaged in Low filter (1-255) (Factory set = 6) | ||
| x = y + (z-y)/s Equation for calculating filtered reading Where x= new filtered reading y= old filtered reading z= new reading s= sample sizeThis equation is calculated with every reading taken by the A/D. 60 readings are taken each second by the A/D. The 'R' response command will get the latest filtered reading. | ||||
| aaSSddcrlf | aaVSddlf | Set number of load counts for window (1-30,000)(Factory set=100) Ex: if R=100,000 window is 99,900 to 100,100 | ||
| aaSWddcrlf | aaVWddlf | Set number of load counts outside window (1-255)(Factory set=10) Window counter will count net counts outside window. Range of window counter is 0 to 10Engage High filter when counter =0 engage Low filter when counter =10 | ||
| Tell (aa=00 is not available) Smart Filters | ||||
| Command | Response | Description | ||
| aaTFcrlf | aaVFddlf | Number of load samples averaged in High filter (1-30,000)(Factory set=100) | ||
| aaTJcrlf | aaVJddlf | Number of load samples averaged in Low filter (1-255)(Factory set=6) | ||
| aaTScrlf | aaVSddlf | Tell number of load counts for window (1-30,000)(Factory set=100) | ||
| aaTWcrlf | aaVWddlf | Tell number of load counts outside window (1-255)(Factory set=10) | ||
| Switch to Modbus Protocol interface | ||||
| Command | Response | Description | ||
| SZ1crlf | Power has to be removed and then reapplied to enter Modbus mode. See separate Modbus User's Manual. | |||
| Additional Commands | ||||
| aaAUTOddcrlf | aaVAUTOddlf | Set to continuous output or demand output. 0=off 1=0.1sec update 2=0.2sec update... 100=10.0sec update | ||
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