27
PaX2a f
reqUenTly
U
sed
m
OdbUs
r
egisTers
Only frequently used registers are shown below. The entire Modbus Register Table can be found at www.redlion.net.
The following is an example of the necessary query and corresponding response for holding register 2. In this example register 2 is the decimal value 123.
Query: 01 03 00 01 00 01 D5 CA
Response: 01 03 02 00 7B F8 67
Notes:
1. The PAX registers can be read as holding (4x) or input (3x) registers.
2. For a value spanning two registers, the portion of the value less than 65,535 will be in (Lo word) register and the portion of the value greater than 65,535 will
continue into (Hi word) register. Negative values are represented by two’s complement of the combined (Hi word) and (Lo word).
3. The PAX2 should not be powered down while parameters are being changed. Doing so may result in an in-complete write to the non-volatile memory and produce
checksum errors.
REGISTER (4x)
REGISTER NAME
LOW LIMIT
HIGH LIMIT
FACTORY
SETTING
ACCESS
COMMENTS
1
Input Relative Value (Hi word)
N/A
N/A
N/A
Read Only
Process value of present input level. This value is affected
by Input Type, Resolution, Scaling, & Offset Value.
(Relative Value = Absolute Input Value + Offset Value)
2
Input Relative Value (Lo word)
3
Maximum Value (Hi word)
-199999
999999
N/A
Read/Write
4
Maximum Value (Lo word)
5
Minimum Value (Hi word)
-199999
999999
N/A
Read/Write
6
Minimum Value (Lo word)
7
Total Value (Hi word)
-199999999 999999999
N/A
Read/Write
8
Total Value (Lo word)
9
Setpoint 1 Value (Hi word)
-199999
999999
100
Read/Write
Active List (A or B)
10
Setpoint 1 Value (Lo word)
11
Setpoint 2 Value (Hi word)
-199999
999999
200
Read/Write
Active List (A or B)
12
Setpoint 2 Value (Lo word)
13
Setpoint 3 Value (Hi word)
-199999
999999
300
Read/Write
Active List (A or B)
14
Setpoint 3 Value (Lo word)
15
Setpoint 4 Value (Hi word)
-199999
999999
400
Read/Write
Active List (A or B)
16
Setpoint 4 Value (Lo word)
17
Setpoint 1 Band/Dev. Value (Hi word)
-199999
999999
0
Read/Write
Active List (A or B). Applicable only for Band or Deviation
Setpoint Action.
18
Setpoint 1 Band/Dev. Value (Lo word)
19
Setpoint 2 Band/Dev. Value (Hi word)
-199999
999999
0
Read/Write
Active List (A or B). Applicable only for Band or Deviation
Setpoint Action.
20
Setpoint 2 Band/Dev. Value (Lo word)
21
Setpoint 3 Band/Dev. Value (Hi word)
-199999
999999
0
Read/Write
Active List (A or B). Applicable only for Band or Deviation
Setpoint Action.
22
Setpoint 3 Band/Dev. Value (Lo word)
23
Setpoint 4 Band/Dev. Value (Hi word)
-199999
999999
0
Read/Write
Active List (A or B). Applicable only for Band or Deviation
Setpoint Action.
24
Setpoint 4 Band/Dev. Value (Lo word)
25
Setpoint Output Register (SOR)
0
15
N/A
Read/Write
Status of Setpoint Outputs. Bit State: 0 = Off, 1 = On. Bit 3
= S1, Bit 2 = S2, Bit 1 = S3, Bit 0 = S4.
Outputs can only be activated/reset with this register when
the respective bits in the Manual Mode Register (MMR)
are set.
26
Manual Mode Register (MMR)
0
31
0
Read/Write
Bit State: 0 = Auto Mode, 1 = Manual Mode
Bit 4 = S1, Bit 3 = S2, Bit 2 = S3, Bit 1 = S4,
Bit 0 = Linear Output
27
Reset Output Register
0
15
0
Read/Write
Bit State: 1 = Reset Output, bit is returned to zero following
reset processing; Bit 3 = S1, Bit 2 = S2,
Bit 1 = S3, Bit 0 = S4
28
Analog Output Register (AOR)
0
4095
0
Read/Write
Linear Output Card written to only if Linear Output is in
Manual Mode.(MMR bit 0 = 1)
29
Input Absolute Value (Hi word)
N/A
N/A
N/A
Read Only
Gross value of present Input level. This value is affected by
Input Type, Resolution, Scaling, but not affected by Offset
Value
30
Input Absolute Value (Lo word)
31
Input Offset Value (Hi word)
-199999
999999
0
Read/Write
Input Offset Value plus the Input Absolute Value equals the
Relative Input Value (standard unit value).
32
Input Offset Value (Lo word)
