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+--- Thread: Modbus write multiple registers (/showthread.php?tid=628)
Modbus write multiple registers - Alferov - 17.02.2017
Hello!
fw 20160927
Modbus
Code:
if not mb then
mbproxy = require('mbproxy')
mb = mbproxy.new()
end
mb:setslave(4)
res, err = mb:writemultipleregisters(46165, o1, o2, o3)
if err then log(err); endQuote:Logs: *string: Illegal function
What not so?
RE: Modbus write multiple registers - admin - 17.02.2017
This is a reply from the slave telling that this function is not supported. Actually, writemultipleregisters only make sense when writing one register to a device which only supports function code 16. With multiple registers writemultipleregisters and writeregisters are identical. Try using writeregisters and write only one register at a time.
RE: Modbus write multiple registers - Alferov - 17.02.2017
In a manual on the device it is written what can be written in this address only through function 16.
I tried writeregisters - too an error: Illegal data!
p.s.
this device - http://bolid.ru/files/373/566/s2_pp_v124_modbus_only_e.pdf
RE: Modbus write multiple registers - Erwin van der Zwart - 17.02.2017
Hi,
Do you have jumper XP1 set to master mode?
Writing to multiple register starting at 46165 is only possible when device is master according to manual.
BR,
Erwin