ALYA VT200 communication protocol
Supported device types and versions
Communication line configuration
Communication station configuration
I/O tag configuration
Literature
Changes and modifications
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Supported device types and versions
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Station protocol parameters
| Key word | Full name | Meaning | Unit | Default value |
|---|
| Local Port | UDP port where KOM awaits responses from the scale. Permitted values are in range 1-65535. | - | 3396 |
| Data Timeout | Timeout receiving message from scale on call from KOM process. | sec.mss | 0.500 |
| No Delete | Setting value to True will cause KOM process not to send buffer delete requests during reading of keystrokes and barcodes. Parameter is useful only during tuning of communication. | - | False |
I/O tag configuration
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| I/O tag address | I/O tag type | Meaning |
|---|
| NETTO | Ai | Net weight in kg.
Note: If a scale reports the unsteady status (see I/O tag STEADY), I/O tag will be Invalid. |
| TARA | Ai | Tare in kg.
Note: If a scale reports the unsteady status (see I/O tag STEADY), I/O tag will be Invalid. |
| Di | Information whether a scale is steady (True) or not yet (False). |
| ZERO | Di | Information whether a scale shows null weight (True) or not (False). |
| RANGE | Ci | Scale range: 0, 1 or 2 according to the standard EN 45510 |
| KEYCODE | TxtI | Keystroke(s) read from keyboard.
Note: After reading keystroke(s) from a keyboard, they are deleted from a keyboard buffer so that during next reading from scale, this I/O tag is set to Invalid (unless parameter ND is set). Therefore, it is necessary to handle keystrokes within ESL script. |
| BARCODE | TxtI | EAN-code read from a bar-code reader.
Note: After reading bar-code from a bar-code reader, it is deleted from the reader so that during next reading from scale, this I/O tag is set to Invalid (unless parameter ND is set). Therefore, it is necessary to handle bar-codes within ESL script. |
| DISPLAY | TxtO | I/O tag that is used for communication with monochromatic display on scale. The string must consist of binary data in the format which is stated in the manual from a producer.
Message format is <XH><XL><YH><YL><WH><WL><HH><HL><data>, where:- XH - high byte for X axis (binary)
- XL - low byte for X axis (binary)
- YH - high byte for Y axis (binary)
- YL - low byte for Y axis (binary)
- WH -high byte for width of bitmap (binary)
- WL - low byte for width of bitmap (binary)
- HH - high byte for height of bitmap (binary)
- HL - low byte for height of bitmap (binary)
- data - binary data of bitmap
Notes:- X axis and bitmap width must be divisible by 8.
- Axes of upper left corner of display are X=0, Y=0. Axes of lower right corner of display are X=239, Y=63.
- One byte of data describes group of eight pixels in one line of display. So, from the axis (0,0) to (7,0) there is necessary one byte, the highest bit of which is described by a pixel (0,0) and the lowest bit by a pixel (7,0).
- All display can be described by (240/8) * 64 = 1920 bytes. But, maximum length of UDP packet is 1500 bytes, i.e. if whole display must be redrawn, it is necessary to send more queries (e.g. first half of display and second half of display).
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Literature
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