Supported device types and versions
Communication line configuration
Communication station configuration
Station protocol parameters
I/O tag configuration
Changes and modifications
Document revisions
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The ASCII Client/Server protocol is intended for parsing serial communication containing simple text-oriented data (data sentences) that conform to a template
StartMark Data1 Separator Data2 Separator .... DataN EndMark
Parameters StartMark, Separator and EndMark parameters can be configured within the station address.
It is also possible to periodically transmit textsend text-oriented data with an identical template - with the fact that the . The StartMark, Separator and EndMark parameters for transmission transmitting can be different from those for receptionreceiving.
Example of received data:
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Note: StartMark, Separator and EndMark parameters can also contain special (control) characters in symbolic form, e.g. <CR> or <LF>. The following table lists the supported characters:
Table 1
| Symbolic form | Character | ASCII value |
|---|---|---|
<NUL> | NUL | 0 |
<SOH> | SOH | 1 |
<STX> | STX | 2 |
<ETX> | ETX | 3 |
<EOT> | EOT | 4 |
<ENQ> | ENQ | 5 |
<ACK> | ACK | 6 |
<BEL> | BEL | 7 |
<BS> | BS | 8 |
<HT> | HT | 9 |
<LF> | LF | 10 |
<VT> | VT | 11 |
<FF> | FF | 12 |
<CR> | CR | 13 |
<SO> | SO | 14 |
<SI> | SI | 15 |
<DLE> | DLE | 16 |
<DC1> | DC1 | 17 |
<DC2> | DC2 | 18 |
<DC3> | DC3 | 19 |
<DC4> | DC4 | 20 |
<NAK> | NAK | 21 |
<SYN> | SYN | 22 |
<ETB> | ETB | 23 |
<CAN> | CAN | 24 |
<EM> | EM | 25 |
<SUB> | SUB | 26 |
<ESC> | ESC | 27 |
<FS> | FS | 28 |
<GS> | GS | 29 |
<RS> | RS | 30 |
<US> | US | 31 |
<SPACE> | SPACE | 32 |
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The following station parameters can be set:
Table 2
| Full name | Description | Unit | Default value | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Waiting after writing data. If writes and reads are related to each other (it is a request and a response), it is possible to set this parameter to send a request, wait, and then process the response. | sec | 00:00.000 | ||||||
| Waiting between data readings. | sec | |||||||
| 00:00. | |||||||||
| 200 | |||||||||
| Maximum reading time of one data sentence (if data input is enabled in the station configuration). | sec | |||||||
| 00:05.000 | |||||||||
| Data transmission period (if | ||||||||
transmitting is enabled in the station configuration). | sec | ||||||||
| 01:00.000 | |||||||||
| If the SerialOverUDP Device Redundant communication line is used, on which two serial servers are configured (e.g. Moxa NPort), the parameter specifies a timeout after which the redundant serial servers will be switched in the event of a communication error (if no data is received within this time limit). | sec | 120 |
| Info | ||||||
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The attached ZIP contains the configuration of the line (Serial over UDP - communication took place via the Moxa NPort serial server), station, and I/O tags with ASCII Client/Server protocol.
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| Kotva | ||||
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Possible value types of I/O tag: Ai, Ci, Ao, Co, Di, Dout.
| Kotva | ||||
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- The output I/O tag has a numerical address (1 ... 999) indicating the position of the value (Data1, Data2 ... Data N) in the sent data sentence.
An I/O tag of type Dout is written as 0/1, an I/O tag of type Ao as a floating point with 2 digits after the decimal point (e.g. -123.45).
Note: if there are no I/O tags for some addresses, then these values will not be sent (nor the separators between them).
Example: Output I/O tags with addresses 1 and 5 are configured, the following data sentence will be sent:
StartMark Data1 Separator Data5 EndMark
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