The Interface Solution Experts
29
HIM
Smart HART
Loop
Interface and Monitor
Therefore according to Tables 4 and 5 the following value in MODBUS Register 13
1000 0010 0000 0000 (binary) or
8200 (hexadecimal) or
-32256 (decimal)
implies “Communications Error” and “RX Buffer Overflow.” See Figure 19.
Note:
Any time the MSB Bit 7 is set to 1 a communications error exists. This error must be corrected in order
for any other status information can be considered as valid.
Another example, using Tables 4 and 5 the
following value in MODBUS Register 13 -
0000 0000 0001 1001 (binary) or
19 (hexadecimal) or
25 (decimal)
implies “Primary variable out of limits” and “Analog output current fixed” and “More status available”.
Figure 20.
Data in Register 13 (using Standard LSW Floating Point Word Order)
7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
BIT #
Most Significant Byte
(HART First Byte)
Least Significant Byte
(HART Second Byte)
The HART Status Information can be found in MODBUS Register 13.
The data in Register 13 (using Standard LSW Floating Point Word Order) is arranged as follows -
