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Supported device types and versions
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This protocol supports the communication with the telemetric stations for remote measurement on of gas meters of by SCT company. It ensures the parallel measurement of data from the meters for wholesale and medium gas consumption and medium one of SPP-Distribúcia a.s. .
| Kotva |
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| komunikacna_linka |
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| komunikacna_linka |
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Communication line configuration
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| Kotva |
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| komunikacna_stanica |
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| komunikacna_stanica |
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Communication station configuration
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- Communication protocol "MODBUS SCT PPU".
- Station The station address is a decimal number in the range of 0 to 255 (usually 1).
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Communication station - configuration dialog box - tab Protocol parameters.
These parameters influence some of the optional protocol parameters. You can define the following station parameters:
Table 1
| Parameter | Meaning | Units | Default value |
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| Maximum count of request retries |
of call any response is not received after these callings| no reply returns after a request had been sent, the station |
switches to the | will be in the status of a communication error |
state the retrying the call if any response has not been | resending a request if no reply had not received. | ms | 500 |
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Timeout between call and first | request before reading the response. | ms | 200 |
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Timeout response Maximum | The maximum number of retries of the reply reading |
the response| . | - | 30 |
| Send only valid data to the D2000 System |
kernel| . If it is set on YES, the Invalid values are not |
send | sent to the system. | YES/NO | YES |
| Filtering of data |
that has a time stamp shifted forward by this value from the current time (in hours)| with a timestamp at least this value hours in the future. The setting |
on switches off | disables this filter. | 0-168 hours | 24 |
| Filtering |
data that have the time stamp shifted back by this parameter from the current time (in days)| of data with a timestamp at least this value days in the past. The setting |
on 0 days switches off | to 0 hours disables this filter. | 0-730 days | 31 |
| Extra debug information about communication on the line including debug information about all gained I/O tag values. | YES/NO | NO |
I/O tag configuration
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I/O tags for non-variable mode: Ai, Ci, TiA
I/o tag address:
Table 2 contains the list of supported I/O tag addresses. The address is in the text format - the value from the column "Address".
Table 2
| Address | Value type | Tech. units | Meaning |
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| VER | Ci | - | Protocol version (0x01). |
| ECSID | Ci | - | The ID of conversion device, it is numbered from 0. |
| RTURDTM | TiA | - | RTU time of last reading the current data from the conversion devices. |
| ECSDTM | TiA | - | Time on the conversion device when the last reading the current data. |
| P | Ai | kPa | Current absolute pressure. |
| T | Ai | °C | Current temperature. |
| F | Ai | m3/hour | Instantaneous flow. |
| CLO | Ai | m3 | Current status of the counter for the calculated quantity of LO. |
| CHI | Ai | m3 | Current status of the counter for the calculated quantity of HI. |
| C | Ai | m3 | Current status of counter for calculated quantity, calculated as C = 10000 * CHI + CLO. |
| C8LO | Ai | m3 | Status of the counter for calculated quantity at 8:00 - LO. |
| C8HI | Ai | m3 | Status of the counter for calculated quantity at 8:00 - HI. |
| C8 | Ai | m3 | Status of counter for calculated quantity at 8:00, calculated as C8 = 10000 * C8HI + C8LO. |
| VH | Ai | m3 | Calculated quantity for the previous hour. |
| VD | Ai | m3 | Calculated quantity for the previous day. |
All values of current data ("P", "T", "F", "CLO", "CHI" and "C") are sent with the time stamp according to "ECSDTM" (i.e. time on conversion device when the last reading the current data) to the D2000 System kernel. A period of data reading is set according to the conversion device. For a device with a mains power supply, it is about 10 minutes.
Time for RTU and conversion device is set remotely from a dispatching of SPP-Distribúcia a.s.
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The values of "VH", "CLO", "CHI" and "C" can be read again from the so-called hour archive (max. 192 hour records).
The values of "VD", "C8LO", "C8HI" and "C8" can be read again from the so-called daily archive (max. 32 daily records).
Archival data can be loaded by the Tell command GETOLDVAL with the parameters a station name and time from which you need these data.
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- Parallel data transmission from the telemetry system of SPP-Distribúcia a.s. for wholesale gas customers, Revision 0.4, (c) SCT s.r.o. Košice, http://www.sct.sk.
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