Technical Manual CODEL
33
Note that this is Standard Modbus protocol NOT Modbus Plus protocol. Reference: AEG Modicon
Modbus Protocol Reference Guide PI-MBUS-300 Rev.D.
0070h NO ppm data 0001h = 1ppm, 001Eh = 30ppm
0071h CO ppm data 0001h = 1ppm, 0190h = 400ppm
0072h Opacity data 0001h = 0.01%, 0064h = 1.00%
0073h MOR data 0001h = 1m, 03E8h = 1000m
0074h Vis dim coeff data 0001h = 0.0001m-1, 00AAh = 0.0170m-1
0075h Optical transmission data 0001h = 0.01%, 0064h = 1.00%
0076h NO/CO detector validation data 0000h = valid,>0000h = invalid
xx01h CO D1 value too large
xx02h CO D2 value too large
xx04h CO D1 value too small
xx08h CO D2 value too small
xx10h CO D1 or D2 in saturation
01xxh NO D1 value too large
02xxh NO D2 value too large
04xxh NO D1 value too small
08xxh NO D2 value too small
10xxh NO D1 or D2 in saturation
0077h Vis emitter low/calibration data 0000h = valid, >0000h = invalid
xx01h Tunnel wash calibration (takes 30 minutes)
xx02h Power-up calibration (takes 4 hours)
01xxh Vis emitter too low
0078h CO detector validation/calibration data 0000h = valid, >0000h = invalid
Joint version of 0076 & 0077 (CO flags in high byte)
007Eh Head type identifier xx01h = AQM
1) Each register is defined to be 2 bytes wide.
2) 30ppm will be represented by binary 0000000 00011110 = 001Eh (hexadecimal).
3) CRC 16 is implemented.
4) Each AQM will have address switch SW1 set as required for the MODBUS address.
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