
Modbus communication
A.4 Modbus register mapping
SITRANS F Ultrasonic flowmeters FST030 (Modbus)
128
Operating Instructions, 08/2017, A5E37367739-AC
Modbus
register
Data type /
Size in
bytes
Parameter
Description
Default value
[units]
1
(units register)
Value range /
Setting options
Access
level
10306
Unsigned / 2 Modbus coil
register 2
Specifies the Modbus register
whose value is checked
against Modbus coil bitmask
2 to determine the coil value
(false or true). A register
value of 65535 specifies that
this coil mapping is unde-
fined.
Undefined
Read /
write
10307
Unsigned / 4 Modbus coil
bitmask 2
Bit mask which is compared
against the register value
specified with Modbus coil
register 2 to determine the
coil value. If any bit of the
register value is set which is
also set in the bit mask then
the coil value is true other-
wise false.
0
0 - 4294967295 Read /
write
10309
Unsigned / 2 Modbus coil
length 2
Output parameter that in-
forms about size in bytes of
parameter that is specified by
Modbus coil address 2. Could
be used to identify the rele-
vant bits of the Modbus coil
bitmask 2
-
Read only
...
10399
Unsigned / 2 Modbus coil
length 20
Output parameter that in-
forms about the size in bytes
of the parameter that is speci-
fied by Modbus coil address
20. Could be used to identify
the relevant bits of the Mod-
bus coil bitmask 20
-
Read only
1
If default value is "-" the command "Set to default" will not set this parameter to default.
A.4
Modbus register mapping
The device provides the possibility to map each existing parameter to a freely chosen
Modbus register for communication purposes over channel 1.