Generic User 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
Generic User Protocol is intended to support an application-level implementation of simple and lightweight communication protocols directly in event. It supports several types of lines including line-redundant and system-redundant ones. Data read from the communication are published into input I/O tags (IN) without waiting for any confirmation from event's side, therefore it is recommended to implement data handling via server event using the action ON CHANGE, eventually by a trigger event with a request queue configured, eventually by enabling multiple executions of the script (action ENABLE) so that all the published data is handled even under heavier load.
Communication line configuration
Category of communication line:
- Serial, Serial Line Redundant, Serial System&Line Redundant
- SerialOverUDP Device Redundant, SerialOverUDP Line Redundant, SerialOverUDP System&Line Redundant
- MOXA IP Serial Library
- TCP/IP-TCP, TCP/IP-TCP Redundant
Note: if a TCP/IP-TCP or TCP/IP-TCP Redundant line has all stations set to StOFF, TCP connection will be closed. Thus it is possible to control TCP communication from event using a tell command STSTAT.
Communication line protocol parameters
Configuration line
dialog box - tab Protocol parameters.
They influences some of the
optional protocol parameters. The following line parameters can be set:
Table 1
| Key word | Full name | Description | Unit | Default value |
|---|---|---|---|---|
| RT | Read Wait Timeout | Waiting between individual data readouts from the communication. If no data was received during this period and previously some data was read, it will be published as a value of input I/O tag IN. If some data was received during this period, it will appended to a buffer, until a timeout occurs or the buffer becomes full (see a parameter Read Size). If a parameter Log Each Read is set to True, data will be published immediately regardless of the value of parameter Read Wait Timeout. |
sec.mss | 1.000 |
| RS | Read Size | Maximum size (in bytes) of input data. Longer data will be published in several chunks. | - | 1024 |
| LE | Log Each Read | If this parameter is set to True, data will be published immediately regardless of the value of parameter Read Wait Timeout. | - | False |
| LF | Log Format | Format of data traces in log files: "0 - Hexa log" or "1 - Text log". Setting the correct format helps to make a communication log file more readable depending on whether the specific protokol is text-oriented or binary by dumping the data in text or hexadecimal format. |
- | 0 - Hexa log |
| SL | Single Log | Setting this parameter to True will make all logs to go to a single file on redundant lines. Setting this parameter to False means that two log files will be created for the primary/secondary line (Serial Line Redundant, SerialOverUDP Line Redundant, TCP/IP-TCP Redundant), or four log files will be created for the primary/secondary line of A/B system (Serial System&Line Redundant, SerialOverUDP System&Line Redundant). |
- | False |
Communication station configuration
- Communication protocol Generic User.
- Station address is not configured; it is recommended to configure a single station per line, but multple stations are supported too. In this case, when data is received from the communication,
it will be published via input I/O tags IN on all configured stations. Likewise, it will be possible to use output I/O tags OUT on any configured station.
I/O tag configuration
Possible value types of I/O tag: TxtI, TxtO.
Input I/O tags:
- Input I/O tag has address IN.
Note: on redundant lines an I/O tag with address IN receives values read from any line (primary/secondary), eventually from any system (A/B). - on line-redundant lines (Serial Line Redundant, SerialOverUDP Line Redundant, TCP/IP-TCP Redundant) it is possible to configure I/O tags with addresses IN_A a IN_B to distinguish inputs from primary/secondary line
- on system-redundant lines (Serial System&Line Redundant, SerialOverUDP System&Line Redundant) it is possible to configure I/O tags with addresses IN_A, IN_B, IN_C, IN_D to distinguish inputs from primary/secondary line of system A/B
Output I/O tags:
- Output I/O tag has address OUT.
Note: on redundant lines values written to an I/O tag with address OUT are written to both lines (primary/secondary), eventually to both systems (A/B). - on line-redundant lines (Serial Line Redundant, SerialOverUDP Line Redundant, TCP/IP-TCP Redundant) it is possible to configure I/O tags with addresses OUT_A a OUT_B to write data to primary/secondary line only
- on system-redundant lines (Serial System&Line Redundant, SerialOverUDP System&Line Redundant) it is possible to configure I/O tags with addresses OUT_A, OUT_B, OUT_C, OUT_D to write data to primary/secondary line of system A/B only
Note: it is possible to configure and use an I/O tag with the address IN and I/O tags IN_A, IN_B, IN_C, IN_D on a single station at the same time.
In a similar way, it is possible to configure and use an I/O tag with the address OUT and I/O tags OUT_A, OUT_B, OUT_C, OUT_D on a single station at the same time.
Literature
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Changes and modifications
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Document revisions
- Ver. 1.0 - October 15, 2015 - creating document
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