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+--- Thread: Function 16 modbus (/showthread.php?tid=3596)
Function 16 modbus - AndresMezaAyala - 29.09.2021
Hi, I have this register: 0022H ---uint16
This has 16 bits, counting from 0 to 15, bits 12 and 13 are for the activation of a relay, how do I write to those bits with the 16 modbus function?
RE: Function 16 modbus - Daniel - 29.09.2021
Add write_multiple to force to use function 16. Use value_bitmask and write_bitmask to write to specific bits.
https://openrb.com/docs/modbus.htm
https://forum.logicmachine.net/showthread.php?tid=839&pid=6729#pid6729
RE: Function 16 modbus - AndresMezaAyala - 29.09.2021
(29.09.2021, 16:55)Daniel Wrote: Add write_multiple to force to use function 16. Use value_bitmask and write_bitmask to write to specific bits.
https://openrb.com/docs/modbus.htm
https://forum.logicmachine.net/showthread.php?tid=839&pid=6729#pid6729
Thanks
RE: Function 16 modbus - AndresMezaAyala - 29.09.2021
(29.09.2021, 16:55)Daniel Wrote: Add write_multiple to force to use function 16. Use value_bitmask and write_bitmask to write to specific bits.So I have the Json but it is not working for me, can it be done by script? and how?
https://openrb.com/docs/modbus.htm
https://forum.logicmachine.net/showthread.php?tid=839&pid=6729#pid6729
{
"manufacturer": "PRUEBA",
"description": "prueba",
"mapping": [
{
"name": "Salida 1",
"bus_datatype": "bool",
"datatype": "uint16",
"type": "inputregister",
"address": 34,
"value_bitmask": "0x1000",
"write_multiple": 1,
"writable": 1,
"bus_address": "" },
{
"name": "Salida 2",
"bus_datatype": "bool",
"datatype": "uint16",
"type": "inputregister",
"address": 34,
"value_bitmask": "0x2000",
"writable": 1,
"write_multiple": 1,
"bus_address": "" }
]
}
RE: Function 16 modbus - Daniel - 29.09.2021
Try address 33, are you sure it is inputregister?
RE: Function 16 modbus - Daniel - 29.09.2021
And make sure you use firmware from 2021
RE: Function 16 modbus - AndresMezaAyala - 29.09.2021
(29.09.2021, 19:45)Daniel Wrote: And make sure you use firmware from 2021
I am using version 20190904, but, That register, bits 8 and 9 are for reading input values, and it is marking me reading normally. The problem is when I want to write to those bits.
RE: Function 16 modbus - Daniel - 29.09.2021
This is not supported in this fw. Install RC2 2021