Nordson Ultimus V - Read Text Packets

2.4.2 Read Text Packets
When a Read text packet is sent, the dispenser sends the requested data back to the client.
NOTE: Refer to “Diagram of Read Text Packet Communication between the Client and Dispenser” on page49 for
a visual representation of the Write command sequence.
The Read text packet sequence is as follows:
5. The client transmits an Enquiry (ENQ / 0x05) to the dispenser.
6. When the dispenser receives the Enquiry (ENQ / 0x05), the dispenser transmits an acknowledgment
(
ACK/0x06) back to the client.
7. When the client receives the acknowledgment (ACK / 0x06), the client must send the Read text packet within
2seconds to avoid a communication timeout.
EXAMPLE:
(STX) + 04 + UA-- + C6 + (ETX)
[In this example, the hyphen (
-) represents an ASCII space value (Hex 0x20].
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 4 U A space space C 6 ETX
0x02 0x30 0x34 0x55 0x41 0x20 0x20 0x43 0x36 0x03
8. When the dispenser receives the text packet, the dispenser transmits a Success Command (A0) text packet to
the client.
EXAMPLE:
(STX) + 02 + A0 + 2D + (ETX)
In the above text packet, the Checksum is 2D. The Checksum calculation method is explained in 2.3.5.
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 2 A 0 2 D ETX
0x02 0x30 0x32 0x41 0x30 0x32 0x44 0x03
If there is an error in the text packet, if it cannot be executed, or if the transmission was interrupted and timed
out (if the client takes more than 2 seconds to send a text packet), the dispenser transmits a Failure Command
(
A2) text packet. Refer to “2.5 Communication Timeout” on page50 for details.
EXAMPLE:
(STX) + 02 + A2 + 2B + (ETX)
The above text packet in hexadecimal format is shown below:
STX 0 2 A 2 2 B ETX
0x02 0x30 0x32 0x41 0x32 0x32 0x42 0x03
Appendix B — RS‑232 Protocol (continued)
Ultimus V High Precision Fluid Dispenser
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