PymateIO-HMI - Revision history

Dodomi: /* modbus_slave.py */

2026-06-14T10:12:02Z

modbus_slave.py

← Older revision		Revision as of 12:12, 14 June 2026
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	</syntaxhighlight>		</syntaxhighlight>

	== ~~modbus_slave.py~~ ==		== Full script ==
	The full modbus_slave.py script.		The full {{fname\|modbus_slave.py}} script.

	<syntaxhighlight lang="python" line>		<syntaxhighlight lang="python" line>

2026-06-14T10:11:24Z

modbus_slave.py

← Older revision		Revision as of 12:11, 14 June 2026
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	# Place your processing code here		# Place your processing code here
	time.sleep_ms(500)		time.sleep_ms(500)
	</syntaxhighlight ~~lang="python"~~>		</syntaxhighlight>


	{{PYMATE-TRAILER}}		{{PYMATE-TRAILER}}

2026-06-14T10:11:10Z

Mainloop and Registers

← Older revision		Revision as of 12:11, 14 June 2026
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	However, it can access them via the {{fname\|modbus_slave}} instance by using same mechanism used by '''on_set_cb''' and '''on_get_cb''' callbacks.		However, it can access them via the {{fname\|modbus_slave}} instance by using same mechanism used by '''on_set_cb''' and '''on_get_cb''' callbacks.

	~~Here another~~ main loop ~~where~~ values ~~are retrieved~~ from Modbus ~~register~~.		The following example shows an alternate main loop retrieving register values from Modbus slave instance.

	<syntaxhighlight lang="python" line>		<syntaxhighlight lang="python" line>

2026-06-14T10:09:02Z

@@ Line 1: / Line 1: @@
 {{PYMATE-HEADER}}
 After the [[Pymate-Modbus-basic|Modbus basics]] let's learn how to use it with an HMI display like the HMI-043U2S.
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 </syntaxhighlight>
 {{PYMATE-TRAILER}}

2026-06-14T10:06:10Z

Mainloop and Registers

2026-06-14T10:03:43Z

Mainloop and Registers

← Older revision		Revision as of 12:03, 14 June 2026
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	{{dbox-orange\|The application main loop do not have a direct access to Modbus registers.}}		{{dbox-orange\|The application main loop do not have a direct access to Modbus registers.}}

	However, it can access them via the {{fname\|modbus_slave}} instance.		However, it can access them via the {{fname\|modbus_slave}} instance by using same mechanism used by '''on_set_cb''' and '''on_get_cb''' callbacks.

	Here another main loop where values are retrieved from Modbus register.		Here another main loop where values are retrieved from Modbus register.

2026-06-14T10:02:32Z

Mainloop and Registers

← Older revision		Revision as of 12:02, 14 June 2026
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	# Place your processing code here		# Place your processing code here
	time.sleep_ms(500)		time.sleep_ms(500)
	<syntaxhighlight ~~lang="python" line~~>		</syntaxhighlight>



	{{PYMATE-TRAILER}}		{{PYMATE-TRAILER}}

2026-06-14T10:02:14Z

Debugging message

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 Modbus: HREGS READ <Request fct=3 qty=2 addr=0 data=None>
 Modbus: COILS READ <Request fct=1 qty=8 addr=0 data=None></nowiki>
 {{PYMATE-TRAILER}}

2026-06-14T09:50:50Z

on_get_cb implementations

← Older revision		Revision as of 11:50, 14 June 2026
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	The following implementation return the value for the holding register 0.		The following implementation return the value for the holding register 0.

	Remind that Master will read '''TWO''' values from the register.		Remind that Master will read '''TWO''' values from the register HREG 0.

	<syntaxhighlight lang="python" line>		<syntaxhighlight lang="python" line>

2026-06-13T23:48:51Z

Debugging message

← Older revision		Revision as of 01:48, 14 June 2026
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	Setting the {{fname\|debug}} attribute to '''True''' will displays the incoming Modbus request on the REPL.		Setting the {{fname\|debug}} attribute to '''True''' will displays the incoming Modbus request on the REPL.

	The following capture shows ~~some of the~~ Modbus requests traveling the RS485 bus ~~for~~ this demonstration.		The following capture shows Modbus requests traveling the RS485 bus related to this demonstration.

	<nowiki>Modbus: COILS READ <Request fct=1 qty=8 addr=0 data=None>		<nowiki>Modbus: COILS READ <Request fct=1 qty=8 addr=0 data=None>

← Older revision		Revision as of 12:06, 14 June 2026
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	# ------------------------------		# ------------------------------
	# List all the coils availables		# List all the coils availables
	# print( list(modbus_slave.coils) )		print( list(modbus_slave.coils) )
	# According to definition this will print [0, 1, 2, 3, 4, 5, 6, 7]		# According to definition this will print [0, 1, 2, 3, 4, 5, 6, 7]
			# Remeber, the LSB bit (bit 0) is the rightmost.
	bit = modbus_slave.get_coil(7)		bit = modbus_slave.get_coil(7)
	print( "Button LED is ", bit )		print( "Button LED is ", bit )
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	#------------------------------		#------------------------------
	# List all the hregs availables		# List all the hregs availables
	# print( list(modbus_slave.hregs))		print( list(modbus_slave.hregs))
	# According to definition this will print [0, 1]		# According to definition this will print [0, 1]
	val0 = modbus_slave.get_hreg(0)		val0 = modbus_slave.get_hreg(0)
	val1 = modbus_slave.get_hreg(1)		val1 = modbus_slave.get_hreg(1)