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+--- Thread: Write one bit in register modbus (/showthread.php?tid=1140)
Write one bit in register modbus - ajgarcia.reyse - 20.12.2017
Hello, I am working with MODBUSÂ module for TESYS U and LM5, but I need to write one bit individually. For example set 602.1 to 1. Could anyone help me please? Thanks
RE: Write one bit in register modbus - admin - 20.12.2017
Are you using profiles or scripts? In any case you will need a script to assemble final register value because profiles do not support writing individual bits.
RE: Write one bit in register modbus - ajgarcia.reyse - 20.12.2017
(20.12.2017, 13:38)admin Wrote: Are you using profiles or scripts? In any case you will need a script to assemble final register value because profiles do not support writing individual bits.
I am using scripts, have you any sample of this kind of scripts? Thanks
RE: Write one bit in register modbus - admin - 21.12.2017
As far as I understand, only one bit from 0..2 range can be set to 1. For this control I suggest creating 1-byte unsigned integer
object and assign custom values (0 = set bit 0, 1 = set bit 1, 2 = set bit 2) to it so you don't have to create binary objects for each bit.
Code:
mode = grp.getvalue('1/1/1') -- 1-byte unsigned integer
paridad = grp.getvalue('1/1/2') -- boolean
control = grp.getvalue('1/1/2') -- boolean
if mode == 2 then
value = 4
elseif mode == 1 then
value = 2
else
value = 1
end
if paridad then
value = value + 8
end
if control then
value = value + 16
end
log(value)