Gamma Vacuum DIGITEL QPC, Instruction Manual

Page: 49 / 59

13. Ethernet communication
Following protocol are support over Ethernet connection:
Gamma Protocol (Running on TCP port 23)
Modbus TCP Protocol (Running on TCP port 502)
Note:
Modbus register map is available on Gamma Vacuum website under download
section.
13.1. Gamma protocol over ethernet connection
Gamma protocol command packet structure over ethernet
connection
A raw TCP session may be established to port TCP 23, allowing remote
control. Once the TCP session is established, commands may be issued.
Note:
In comparison to communication over serial connection, no address field and no
checksum fields are required.
Gamma protocol response packet structure over ethernet
connection
In comparison to response structure over serial communication:
▪
No address field is supplied in response
▪
No checksum field is supplied in response
▪
Termination field is two ASCII carriage return characters, followed by
ASCII line feed character, followed by prompt character “>”
See Table: Response packet structure over serial connection for details.
Table 10. Command packet structure over ethernet connection
Start space Command
code
space Data
(optional)
Terminator
3 bytes 1 byte 2 bytes 1 byte Variable 1 byte
Field Size Comment
1 START 3 ASCII hex characters ASCII characters are ‘cmd’
Start is the first 3 digits in the command packet and tells controller to start decoding a
message.
3
COMMAND
CODE
2 ASCII hex characters Range 00 through FF
See Gamma protocol commands on page 43 for list of available command codes. The
command code must be two hex digits, even if the first digit is a zero.
4
DATA As needed ASCII printable characters only
Page 49 900031_J
900031_J - Ethernet communication