Premex CALMEX II communication protocol
Supported device types and versions
Communication line configuration
Communication station configuration
I/O tag configuration
Literature
Changes and modifications
Document revisions
Supported device types and versions
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Communication station configuration
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- Communication protocol: Premex CALMEX II
- Station address is a decimal number within the range of 1..250 250 (or a hexadecimal number with a hash at the beginning, e.g. #0A) – it is VKP address. By default, the address is set by the manufacturer according to the serial number (identification number) of the measuring device as the last three digits. If last three digits are greater than 250, the higher digit of them is not taken into account. If the serial number is one of the numbers of 000, 300, 400, 500, 600, 700, 800, 900 then must be changed.
- Recommended polling parameters: Delay at least 1 minute.
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The following station protocol parameters can be defined:
Table 1
| Keyword | Full name | Meaning | Unit | Default value |
|---|
| Retry Count | Poll repetition count in case of a communication error. | - | 2 seconds |
| Retry Timeout | Delay between poll repetition in case of a communication error. | ms | 100 ms |
| Wait Timeout | Delay between response readings till its finalization. | ms | 500 ms |
| Wait First Timeout | First waiting for response after sending the poll. | ms | 800 ms |
| Max Wait Retry | Repetition count of response readings till its finalization. | - | 40 |
| WakeUp Length | Length (given in characters) of so-called wake-up message sent before each poll. | - | 20 |
| WakeUp Delay | Delay between wake-up message and poll. It is recommended to enable the option WaitTxEMPTY in the line mode configuration. | ms | 400 |
String containing the protocol parameters is being defined as follows:
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I/O tag configuration
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Possible I/O tag types: Ai, Ci, TiA
Address: It requires to enter one number, listed in the following tableA number fro the following table must be entered (as a decimal number or as a hexadecimal number with a hash at the beginning, e.g. #0A):
Table 2
| Address | Meaning | Type | Units |
|---|
| 1 | Measuring device ID. | Ci | - |
| 2 | Access number (measurement number incremented by 1 for each data reading). | Ci | - |
| 3 | Status number, bit descriptions see the table 3, individual bits are sent to the value attributes. | Ci | - |
| 4 | Heat quantity. | Ai | MJ,GJ,kWh,MWh |
| 5 | Heat rate. | Ai | W,kW,MW |
| 6 | Volume overflow. | Ai | l,m3 |
| 7 | Volume flow. | Ai | l/h,m3/h |
| 8 | Forward temperature. | Ai | ºC |
| 9 | Return temperature. | Ai | ºC |
| 10 | Measuring device date+time. | TiA | - |
| 11 | Heat quantity on the 1st date. | Ai | MJ,GJ,kWh,MWh |
| 12 | Heat quantity on the 2nd date. | Ai | MJ,GJ,kWh,MWh |
| 13 | Volume overflow on the 1st date. | Ai | l,m3 |
| 14 | Volume overflow on the 2nd date. | Ai | l,m3 |
| 15 | 1st date of data. | TiA | - |
| 16 | 2nd date of data. | TiA | - |
Values saved on 1st date or 2nd date are sent to the D2000 system with the save time. Measuring unit of individual parameters depends on the measuring device type.
Meaning of status word bits (Ci address - 3)
Table 3
| Bit number | Meaning | Value attribute |
|---|
| 0 | Always 0. | A |
| 1 | 0 - current value, 1 - stored value. | B |
| 2 | Low input power. | C |
| 3 | Constant error. | D |
| 4 | Temporary error. | E |
| 5 | Water-meter error. | F |
| 6 | Temperature pickups error. | G |
| 7 | Always 0. | H |
Literature
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