Modbus Martem - Revision history

MarkTomm: /* Analog output objects */

2022-05-03T05:16:29Z

Analog output objects

← Older revision		Revision as of 05:16, 3 May 2022
Line 79:		Line 79:
	==== Analog output objects ====		==== Analog output objects ====

	Analog output objects ~~always~~ use MODBUS_SET_SINGLE_REGISTER as function code.		Analog output objects use MODBUS_SET_SINGLE_REGISTER as function code for "SubType v" Normalized.

			MODBUS_SET_MULTIPLE_REGISTER on Float, Int32, UInt32.

MarkTomm at 06:18, 19 August 2016

2016-08-19T06:18:19Z

@@ Line 1: / Line 1: @@
 == Addressing scheme ==
 Telem Application Modbus function code enumeration:
@@ Line 18: / Line 38: @@
 </pre>
-Lower device addressing has small differences for input and output objects in Telem Application.
+Function code extracting has small differences for input and output objects in Telem Application.
 Input objects function code is determined from the address in the following way:
@@ Line 42: / Line 64: @@
 </pre>
-Note that ...
+==== Digital output objects ====

MarkTomm: Uus lehekülg: '== Addressing scheme == Telem Application Modbus function code enumeration:

 enum ModbusFunctionCodes {     MODBUS_FN_UNSUPPORTED           = 0x0,     MODBUS_READ_COIL    ...'

2016-08-18T08:05:05Z

Uus lehekülg: '== Addressing scheme == Telem Application Modbus function code enumeration: <pre> enum ModbusFunctionCodes { MODBUS_FN_UNSUPPORTED = 0x0, MODBUS_READ_COIL ...'

New page

== Addressing scheme ==

Telem Application Modbus function code enumeration:

<pre>
enum ModbusFunctionCodes
{
MODBUS_FN_UNSUPPORTED = 0x0,
MODBUS_READ_COIL = 0x1,
MODBUS_READ_INPUT = 0x2,
MODBUS_READ_HOLDING_REGISTERS = 0x3,
MODBUS_READ_INPUT_REGISTERS = 0x4,
MODBUS_FORCE_SINGLE_COIL = 0x5,
MODBUS_SET_SINGLE_REGISTER = 0x6,
MODBUS_FORCE_MULTIPLE_COIL = 0xF,
MODBUS_SET_MULTIPLE_REGISTER = 0x10
};
</pre>

Lower device addressing has small differences for input and output objects in Telem Application.

Input objects function code is determined from the address in the following way:

<pre>
if(100000 <= address)
fn_code = address / 100000;
else
fn_code = address / 10000;

switch( fn_code )
{
case 0:
return MODBUS_READ_COIL;
case 1:
return MODBUS_READ_INPUT;
case 3:
return MODBUS_READ_INPUT_REGISTERS;
default:
case 4:
return MODBUS_READ_HOLDING_REGISTERS;
}
</pre>

Note that ...