Dataloger ESC8800
Datalogger ESC8800 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
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 – writing | TOA | SET TIME | Command Response String 6 – 20 |
Communication line configuration
Communication line category: Serial
Baud rate according to the ESC datalogger settings - the command CENTRAL SPEED,
1 stop bit,
8 data bits,
No parity,
No handshaking.
Communication station configuration
Communication protocol: ESC 8800.
The station address is a number within the range of 0..255 specified as a decimal number or as a hexadecimal number with a hash at the beginning (e.g. #0A). The station address must be identical to the datalogger settings - the SET ID command.
Station configuration is different from implementation in the versions D2000 v3.XX. The station time parameters and their priorities are used, one datalogger device must be divided into logical stations as follows:
Current values: the delay at least 1 second, station priority 0. Current measurements of channels and digital inputs are configured at this station. This is a logical station with the lowest priority, the delay parameter may not be less than 1 second.
Note: Datalogger 8800 does not provide any current data - the data are acquired from one-minute averages. Therefore it is not necessary to create the station.1m averages - the period 1 minute, the offset 5..10 seconds, station priority 1. One-minute averages of channel measurements are configured at this station. This is a logical station with a higher priority, the parameter offset shouldn't be less than 5 seconds - this is the time provided for the datalogger for processing values.
30m averages - the period 30 minute, the offset 5..10 seconds, station priority 2. Thirty-minute averages of channel measurements are configured on this station. This is a logical station with even higher priority, the parameter offset shouldn't be less than 5 seconds - this is the time provided for the datalogger for processing values. Setting the period to 30 minutes must be initialized in the datalogger by using the command "SET INT 30".
Calibrations – station with a required period for reading calibration results.
Station protocol parameters
The following station protocol parameters can be defined:
Table 2
Keyword | Full name | Meaning | Unit | Default value |
|---|---|---|---|---|
RC | Retry Count | The number of request repeats in case of a communication error. | - | 2 |
RT | Retry Timeout | The delay between individual request repeats in case of a communication error. | ms | 1000 ms. |
WFT | Wait First Timeout | The delay after transmitting the request before reading the response. | ms | 500 ms. |
WT | Wait Timeout | The delay between response readings until its finalization. | ms | 400 ms. |
MWR | Max Wait Retry | The number of repeats of response readings until its finalization. | - | 8 |
GSI | Get Stored Interval | The size of the period, for which the archive data from the datalogger are read without interruption. The period is specified in minutes. If the value of the period is e.g. 60 minutes, so all archive data from e.g. 05:00 to 06:00 are read, then data from 06:00 to 07:00 etc. The reading of archive data from this period shouldn't take more than one minute, because otherwise some of the current data, acquired among archive readings, could be lost. | min | 10 min. |
VP | Validity Percent | Valid measurement percentage for declaring the measured interval valid. | % | 67.000 |