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
and no checksum fields are supplied in response. See
packet structure over serial connection
for more information.
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
on page 42 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 48
900034_C
900034_C - Ethernet communication
