Supported device types and versions
Communication line configuration
Communication station configuration
I/O tag configuration
Literature
Changes and modifications
Document revisions
The protocol supports communication with ESC 8800 dataloggers.
Implementation was performed and verified according to the ESC Model 8800 – datalogger Engineering Manual – TIN 97-1023, February 1997 documentation for the datalogger software version 6.
Communication includes:
Table 1
| Measurement type | I/O tag type | Communication function | Documentation |
|---|---|---|---|
| Current values | AI | PRINT MINUTE | Command Response String 6 – 16, 17 |
| Current values flags | DI | PRINT MINUTE | Command Response String 6 – 16, 17 |
| 1m averages | AI | PRINT MINUTE | Command Response String 6 – 16, 17 |
| 1m average flags | DI | PRINT MINUTE | Command Response String 6 – 16, 17 |
| 30m averages | AI | PRINT AUX | Command Response String 6 – 14, 15 |
| 30m average flags | DI | PRINT AUX | Command Response String 6 – 14, 15 |
| 60m averages | AI | PRINT HOUR | Command Response String 6 – 7, 8 |
| 60m average flags | DI | PRINT HOUR | Command Response String 6 – 7, 8 |
| Digital inputs | DI | SENSE IN | Command Response String 6 – 9, 10 |
| Calibrations | AI | PRINT CAL | Command Response String 6 – 12, 13 |
| Real time – write | TOA | SET TIME | Command Response String 6 – 20 |
Station configuration is different from implementation in the versions D2000 v3.XX. There are used station time parameters and their priorities, one datalogger must be divided into logical stations as follows:
There can be defined the following station protocol parameters:
Table 2
| Keyword | Full name | Meaning | Unit | Default value |
|---|---|---|---|---|
| Retry Count | Poll repetition count in case of a communication error. | - | 2 | |
| Retry Timeout | Delay between poll repetition in case of a communication error. | ms | 1000 ms. | |
| Wait First Timeout | Delay after transmitting the poll before reading the response. | ms | 500 ms. | |
| Wait Timeout | Delay between response readings till its finalization. | ms | 400 ms. | |
| Max Wait Retry | Repetition count of response readings till its finalization. | - | 8 | |
| Get Stored Interval | Period, during which there are read archive data from the datalogger without interruption. The period is given in minutes. If the value of the period is e.g. 60 minutes, so there are read all archive data from e.g. June 3rd 1996 05:00 to 06:00, then from 06:00 to 07:00 etc. Loading archive data within the period couldn't take more than one minute, because there could be lost some current data acquired among archive readings. | min | 10 min. | |
| Validity Percent | Valid measurements percentage for making measured interval valid. | % | 67.000 |
String containing the protocol parameters is being defined as follows:
Keyword=value;Keyword=value; ...
Example:
RC=1;RT=500;MWR=10;
If there is used a keyword with an invalid value in the initialization string, there will be used corresponding default value according the table 2.
Support of communication with ESC 8800 comprises acquisition and setting of the following values:
I/O tag type is Ai, measurement type is ACTUAL. Channel number is defined as a decimal number within the range of 0..99 or as a hexadecimal number with a hash at the beginning (e.g. #0A).
Current values flags are DI type (Digital Input). Measurement type is ACTUAL Flag.
Note: At defining the No missing data <blank> flag, you can use the character _ (underline) for transparency.
Averages are values of AI type (Analog Input). Measurement type is 1m AV for one-minute averages, 30m AV for half-hour averages and 60m AV for hour averages. Channel number is defined as a decimal number within the range of 0..99 or as a hexadecimal number with a hash at the beginning (e.g. #0A).
Flags of averages are values of DI type (Digital Input). Measurement type is 30mAV FLAG for half-hour averages and 60mAV FLAG for hour-averages.
Note: At defining the No missing data <blank> flag, you can use the character _ (underline) for transparency.
Digital inputs are value of DI type (Digital Input). Measurement type is Dig.Input. Digital input number is defined as a decimal number within the range of 0..999.
Calibration results are values of AI type (Analog Input). Measurement type is CAL-Ph1 for the first calibration phase or CAL-Ph2 for the second calibration phase. Channel number is defined as a decimal number within the range of 0..99 or as a hexadecimal number with a hash at the beginning (e.g. #0A).
For each station (on logger ESC8800 physically), there can be configured one I/O tag of TOA type containing real time. The I/O tag is necessary for real time synchronisation - datalogger -> computer.
Logger ESC 8800 executes a local archiving of measured values. The values can be requested automatically on a dispatcher system breakdown or directly by the dispatcher (D2000 HI, D2000 EventHandler) to complete the D2000 dispatcher system archive.
The method described above allows to acquire calibration values, which are 30 day old, 30m averages for last 31 days and 1m averages for the last 60 minutes.
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