Communication Sequence; Write Text Packets - Nordson EFD Ultimus V Manuel Utilisateur

Doseur de Fluide Haute Précision Ultimus V
Annexe B — Protocole RS-232 (suite)

2.4 Communication Sequence

The dispenser uses two communication sequences: Write (2.4.1) and Read (2.4.2).

2.4.1 Write Text Packets

Write text packets are used when the client (PLC / PC) sets a parameter on the dispenser, but does not require
feedback data.
NOTE: Refer to "Diagram of Write Text Packet Communication between the Client and Dispenser" on page 47 for
a visual representation of the Write sequence.
The Write text packet sequence is as follows:
1. The client transmits an Enquiry (
2. When the dispenser receives the Enquiry (
( ACK / 0x06 ) back to the client.
3. When the client receives the acknowledgment (
2 seconds to avoid a communication timeout.
EXAMPLE:
(STX) + 08 + PS-- + 0500 + F0 + (ETX)
[In this example, the hyphens (
In the above text packet, the Checksum is
NOTE: The plus signs (+) are present only to show how each character is appended to form the example text
packet; they are not part of the transmitted data. The parentheses are present only to indicate a single-byte
control character, and are also not part of the transmitted data.
The above text packet in hexadecimal format is shown below:
STX 0
0x02 0x30
4. When the dispenser receives the text packet and successfully executes it, the dispenser transmits a Success
Command ( A0
EXAMPLE:
(STX) + 02 + A0 + 2D + (ETX)
In the above text packet, the Checksum is
NOTE: The plus signs (+) are present only to show how each character is appended to form the example text
packet; they are not part of the transmitted data. The parentheses are present only to indicate a single-byte
control character, and are also not part of the transmitted data.
The above text packet in hexadecimal format is shown below:
STX 0
0x02 0x30
46
www.nordsonefd.com/fr EFDEU-South@nordson.com
ENQ / 0x05
ENQ
-- ) represent ASCII space values (hexadecimal
F0
8 P S space
0x38 0x50 0x53 0x20
) text packet to the client.
2D
2 A 0
0x32 0x41 0x30 0x32
+33 (0) 1 30 82 68 69 Les services et les points de vente des systèmes de dosage Nordson EFD sont présents dans le monde entier.
) to the dispenser.
/ 0x05 ), the dispenser transmits an acknowledgment
ACK / 0x06 ), the client must send the Write text packet within
. The Checksum calculation method is explained in 2.3.5.
space 0 5
0x20 0x30 0x35
. The Checksum calculation method is explained in 2.3.5.
2 D ETX
0x44 0x03
0x20 ].
0 0 F 0
0x30 0x30 0x46 0x30
ETX
0x03