Instruction manual

57
4000 Modbus Implementation
Termination resistors of 120 Ohms are shown at each end of the communication bus to
minimize reflections on the line. Termination resistors may not be necessary at baud
rates of 9600 bits per second or slower. Pull-up and pull-down resistors are also shown
at the Modbus master end of the cable. These resistors minimize the affects of noise
when the lines are idle. Only one set of pull-up or pull-down resistors are required per
twisted pair cable.
9.12 Integer Register Map
Register Number Type Description
0ScaledLevel
1ScaledTemperature
2 Reserved
3 Reserved
4 Reserved
5Bit FieldAimStat
Bit Usage
0 CRIT LO LEVEL
1 ADV LO LEVEL
2 ADV HI LEVEL
3 CRIT HI LEVEL
4 CRIT LO TEMP
5 ADV LO TEMP
6 ADV HI TEMP
7 CRIT HI TEMP
8 HW IN 1
9 HW IN 2
10 ..15 RESERVED
6 Bit Field DiagStat
Bit Usage
0 BAD LEVEL
1 BAD TEMP
2 BAD EE
3 BAD EE CKSUM
4 BAD RAM
5 BAD EPROM
6 LOCAL MODS
7 NO CALC
8 CFG ERROR
9 CALC ERROR
10 BAD CPU BOARD
11 BAD COMM BOARD
12 LOW ENC BATT
13.15 RESERVED