Hamilton Electronics EPHUM011 manual Description of the Analog Interfaces 1, MA interface #1, 0x02

pH ARC Sensors Modbus RTU Programmer’s Manual (EPHUM011)

2.4.3 Description of the Analog Interfaces 1 and 2

Register 4352 / 4480 contain the descriptions of AO1 / AO2 as plain text ASCII:

Start	Number of	Reg1 … Reg8	Modbus	Read	Write
register	registers	16 ASCII characters	function code	access	access
4352	8	Description of AO1	3, 4	U/A/S	none
4480	8	Description of AO2	3, 4	U/A/S	none

Figure 2.4.2.1: Definition of register 4352 and 4480

Command: Current interface text		Modbus address: 4352	Length: 8	Type: 3	Read
Parameter:	Text
Format:	Character
Value:	mA interface #1

Figure 2.4.2.2: Example to read the description of AO1. The text is “mA interface #1”. Accordingly, AO1 is physically configured as a 4-20 mA current output.

Command: Current interface text		Modbus address: 4480	Length: 8	Type: 3	Read
Parameter:	Text
Format:	Character
Value:	mA interface #2

Figure 2.4.2.3: Example to read the description of AO2. The text is “mA interface #2”. Accordingly, AO2 is physically configured as a 4-20 mA current output.

Attention:

pH ARC Sensors do not have an ECS (in contrast to VISIFERM DO)!

Data structure: register address offset between AO1 and AO2 is always 128.

2.4.4Selection of an Analog Interface Mode

The analog interface mode of AO1 / AO2 is selected by programming the analog interface mode in register 4360 / 4488.

Start	Number of		Reg1 / Reg2		Modbus		Read	Write
register	registers				function code		access	access
4360	2		Active analog interface mode for AO1		3, 4, 16		U/A/S	S
4488	2		Active analog interface mode for AO2		3, 4, 16		U/A/S	S
Figure 2.4.4.1: Definition of register 4360 / 4488. Only one bit can be set.
Command: Active interface mode				Modbus address: 4360	Length: 2	Type: 16		Write
Parameter:		Mode
Format:		Hex
Value:		0x02

Figure 2.4.4.2: Example to set the analog interface mode of AO1 to 0x02 (4-20 mA linear output).

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