Fema B RTU Series, User Manual, Page: 13 / 36

FEMA ELECTRÓNICA . SERIES B . Models Bxx-RTU
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1.18 Registers and functions : 16 bits ‘Full Slave’
List of available registers (see Table 16), available ‘coils’ (see
Table 17)
and available functions
(see Table 18)
for instru-
ments configured in ‘Full slave’ mode and 16 bits data length.
• accessing a function not listed in the table, returns error
1 ‘Illegal Function’.
• accessing a register not listed in the table, returns error
2 ‘Illegal Data Address’.
• working with 16 bit registers allows for codification of
numbers between 32767 and -32767. To work with num -
bers up to 999999 / -199999, configure registers for 32 bits
data
(see section 1.21.5).
• after power loss, the instrument starts up with all regis -
ters initialized to ‘0’
(see section 1.16).
• the ‘Resolution’ register contains a numerical value indi -
cating the number of decimal places on display. Valid val -
ues from 0 to 5. Writing value 2 lights the decimal point at
position XXXX.XX. Non valid values are discarded and no
error message is generated.
• alarms can be controlled using ‘Alarm’ registers or ‘coils’.
By default, alarms are controlled by coils
(see Table 17).
To
enable the ‘Alarm’ register see section 1.21.6 . The ‘Alarm’
register is made of bits. Bit ‘0’ controls the state of Alarm 1,
bit ‘1’ control the state of Alarm 2 and bit ‘2’ controls the
state of Alarm 3
• all registers are read and write registers.
• access to reserved registers does not generate error
messages.
Register number Name
0 Display
1 Resolution
2 Alarms
3
4
5
Reserved
Table 16 - Registers in 16 bits and ‘Full Slave’ mode
‘Coil’ number Name
0 Alarm 1
1 Alarm 2
2 Alarm 3
3
4
5
6
7
Reserved
Table 17 - ‘Coils’ in 16 bits and ‘Full Slave’ mode
Function number Name
6 Write single register
16 Write multiple registers
3 Read registers
5 Write single ‘coil’
15 Write multiple ‘coils’
1 Read ‘coils’
Table 18 - Functions in 16 bits and ‘Full Slave’ mode
Example - to update the display of the instrument to a value
of 432.1, write onto ‘Display’ register the number ‘4321’ and
write onto ‘Resolution’ register the number ‘1’.
Register ‘Display’ : ‘4321’
Register ‘Resolution’ : ‘1’