Serial Number (15H, 16H); Hart Enable (1D); Hart Test (1E); Comm Rxd Crc Errors (26H) - MSA FL500 Operating Manual

Operational Mode Command Register Details

3.19. Serial Number (15H, 16H)

The serial number is a 32-bit word but the value is only 23 bits long. The upper bits are always zero to keep
the FL500 serial number and the HART serial number the same. Address 0x16 has the lower part of the
serial number. Address 0X15 has the upper part of the serial number.

3.20. HART Enable (1D)

If the HART protocol is installed, a Write command of 1 enables HART communication.
Function
Enable
Disable
EXCEPTION: If the HART protocol is not installed when a command is sent to the HART Enable bit,
Exception Code 01 (Illegal Function) is sent back.

3.21. HART Test (1E)

If the HART protocol is installed, this command is used to do a test of HART output. A Write command of 1
sends constant zeros to HART output. A Write command of 2 sends constant ones to HART output.
Code
0
1
2
EXCEPTION: If HART communication is not installed when a command is sent to the HART Test bit,
Exception Code 01 (Illegal Function) is sent back.

3.22. Comm RXD CRC Errors (26H)

Because the FL500 has a 16-bit CRC, Hi and Lo CRC errors are given in the same 16-bit word. A Read
command from the previous Hi or Lo CRC address sends back the same count.
US

3.23. Comm UART Errors (2AH)

A Read command sends back the total number of Modbus Comm UART errors that have occurred in the
slave device. The maximum number of the counter is 65535. When the maximum number occurs, the
counter resets to zero and starts to count again. Individual communication errors such as Overrun, CRC,
Parity, and Framing errors are included in the total number.

3.24. Comm Clear UART (2CH)

A Write command of 0 enables the Clear Comm Errors bit to reset all Modbus UART Comm Error counters
to zero. The function is enabled momentarily and resets automatically after use.

3.25. Comm Clear Stats (2DH)

A Write command of 0 enables the Clear Comm Errors bit to reset all Modbus Comm Error counters to zero.
The function is enabled momentarily and resets automatically after use.
16
Bit (LSB) Access
1 Read/Write
0 Read/Write
Results
Normal
Constant ones
Constant zeros
FL500 Modbus Communication Operating Manual