Host Commands Polycold Cryochiller
Command Format Installation and Operation Manual
Brooks Automation
7-2
214072 Revision B
Command Format
Command Format
Commands are either GET or SET commands based on comma separated parameters following the
command name. Use GET to check the status of something and SET to change a setting.
Host commands use the following protocol
• Must be sent by RS-232 or Ethernet connection
• Ethernet port for Host commands is port 5000
• Must begin with the $ character followed by the specific command with associated parameters.
• Parameters are separated with a comma.
• Command must end with a single character checksum.
• The Checksum is a single character that follows the parameters and is not separated by a
comma. Software interprets the last character in a string as the command checksum.
• Checksum is calculated by the 8 bit sum of all characters sent following $calculated by the
equation in Checksum Calculation on page 7-4.
• Must be terminated with an ASCII Carriage Return (CR) (Hex 0D).
• Must be sent complete to Polycold Cryochiller under 10 seconds from the $ to the <CR> for the
unit to recognize data sent as a complete command
• Must be sent as uppercase ASCII characters
Get Example:
Get software version “$SW_VER,?P(CR)”.
Set Example:
Set cooling termination set point “DEFR_SETPT,1,19D(CR)”.
Response Format
The first character of the response from the Polycold system to the external device provides information
about the specific command received along with information about whether the command succeeded.
Table 7-1: Command Response Codes
Letter Meaning
‘A’ Command understood, reply (if any) follows.
‘C’ Proper command, which cannot be acted upon currently for some reason which, may
be temporary or correctable. Typically because you have not entered the correct
security level.
‘F’ Invalid command or invalid data argument for the given command. Set commands
have min and max values associated with each command. If a set command uses a
value outside the min/max range, ‘F’ is the response.
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