pH ARC Sensors Modbus RTU Programmer’s Manual (EPHUM011)
2.4Configuration of the Analog Interfaces
2.4.1 Available Analog Interfaces
A pH ARC Sensor has two individual physical analog interfaces that have identical functionalities, but can be configured independently from each other.
Analog Output Interface 1 (AO1)
Analog Output Interface 2 (AO2)
The number of analog interfaces is defined in register 4320.
Start | Number of | Reg1 / Reg2 | Modbus | Read | Write |
register | registers |
| function code | access | access |
4320 | 2 | Available analog interfaces | 3, 4 | U/A/S | none |
Figure 2.4.1.1: Definition of register 4320.
Command: Avail analog interfaces | Modbus address: 4320 | Length: 2 | Type: 3 | Read | |||
Parameter: | Available analog |
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| interfaces |
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Format: | Hex |
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Value: | 0x03 |
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Figure 2.4.1.2: Example to read the available analog interfaces. The answer is “0x03”meaning that there exists an Analog Interface 1 (AO1) and an Analog Interface 2 (AO2).
2.4.2 Available Analog Interface Modes
With register 4322, the available analog interface modes for AO1 and AO2 are defined
Start |
| Number of |
| Reg1 / |
| Reg3 / | Reg5 / | Reg7 / |
| Modbus | Read |
| Write | |
register |
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| Reg2 |
| Reg4 | Reg6 | Reg8 |
| function | access |
| access | |
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4322 | 8 |
| Available |
| Available | reserved | reserved |
| 3,4 | U/A/S |
| none | ||
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| Analog |
| Analog |
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| Interface |
| Interface |
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| Modes for | Modes |
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| AO1 |
| for AO2 |
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Figure 2.4.2.1: Definition of register 4322. It defines the analog interface modes available for AO1 and | ||||||||||||||
AO2. The analog interface modes are described in Figure 2.4.2.2. |
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Code |
| Analog Interface |
| Description |
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(Hex) |
| Mode |
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0x00 |
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| Analog interface deactivated |
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0x01 |
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| Set to a constant output value for current loop testing |
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0x02 |
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| Linear output of measurement (PMC1 / 6) |
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0x04 |
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| Bilinear output of measurement (PMC1 / 6) |
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Figure 2.4.2.2: Definition of the analog interface modes, valid for both AO1 and AO2.
Command: Analog Interface Modes | Modbus address: 4322 | Length: 8 | Type: 3 | Read | ||
Parameter: | Available Analog | Available Analog | reserved |
| reserved |
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| Interface Modes for | Interface Modes for |
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| AO1 | AO2 |
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Format: | Hex | Hex | Hex |
| Hex |
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Value: | 0x07 | 0x07 | 0x0 |
| 0x0 |
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Figure 2.4.2.3: Example to read register 4322: all modes defined in figure 2.4.2.2 are available for both AO1 and AO2.
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