Instruction manual

204 Using Modbus
®
Protocol with Micro Motion
®
Transmitters
RFT9739 Security and Administration continued
20.2 Saving non-volatile data As you perform configuration and characterization tasks, the transmitter
automatically saves data every few seconds. However, at any time, you
can save non-volatile data by setting coil 00018. See
Table 20-1. Coil
00018 is a momentary coil, and will reset to 0 automatically.
20.3 Security coils Security coils enable you to protect all calibration factors, selected
registers, or selected coils.
Defining security for all
calibration factors
Define security for all calibration factors by setting security coil 00113 or
00125. See
Table 20-2.
• Coil 00113 prevents reading of calibration factors.
• Coil 00125 write-protects calibration factors.
You may set either or both.
Table 20-1. Coil for saving non-volatile data
Coil Coil function
Bit
status
RFT9739
00018 Coil is OFF
Coil is ON, non-volatile data are being saved
0
1
Ö
Table 20-2. Calibration factor security coils
Security
coil
Function If ON, coil secures these calibration factors: RFT9739
00113 Prevent reading
ASCII registers
50072-50074
50075-50076
50080-50089
Flow calibration factor
Flow temperature coefficient
Temperature calibration factor
Ö
00125 Write-protect
Ö
Register pairs
20155-20156
20157-20158
20157-20158
20161-20162
20163-20164
20279-20280
20281-20282
20283-20284
Density for low-density calibration
Density for high-density calibration
Density calibration constant 1
Density calibration constant 2
Density temperature coefficient
Mass flow meter factor*
Volume flow meter factor*
Density meter factor*
*Does not apply to Version 2 RFT9739 transmitter.