Nordson Ultimus V - Text Packet Example

2.3.7 Text Packet Example
The following is a visual example of a text packet. This example uses the Pressure Set Command (PS--0500) to
send a 50.0 psi value to the dispenser.
NOTE: The two hyphens (
--) in the Pressure Set Command are used to denote two spaces (hex 0x20).
The text packet:
Start of Text
Bytes Used for Checksum
Bytes Used for No. Bytes
No. Bytes
Command
Data Checksum
End of Text
The text packet in hexadecimal format:
STX 0 8 P S space space 0 5 0 0 F 0 ETX
0x02 0x30 0x38 0x50 0x53 0x20 0x20 0x30 0x35 0x30 0x30 0x46 0x30 0x03
Bytes used to calculate
the Checksum
Checksum
appended
Checksum calculation example based on the above text packet:
0 - 0x30 - 0x38 - 0x50 - 0x53 - 0x20 - 0x20 - 0x30 - 0x35 - 0x30 - 0x30
= 0xFDF0
The least significant byte of the above value is F0, so this value is appended to the text packet after the Data bytes.
The End of Text control character (
ETX / 0x03) is appended.
Appendix B — RS‑232 Protocol (continued)
Ultimus V High Precision Fluid Dispenser
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