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
45
www.nordsonefd.com [email protected]
800-556-3484 Sales and service of Nordson EFD dispensing systems are available worldwide.