Command Messages
Chapter Nine: RS-232 Communications
274
Chapter References for Miscellaneous Messages
Function
Chapter
Audio Alarm
Chapter Seven: Operation in Setup Mode
Front Panel Lockout
Chapter Three: Operation in Overview Mode
Select Pressure Units
Chapter Seven: Operation in Setup Mode
Optional Checksum
Applies to RS-232 messages only
see below
Save to EEPROM
Applies to RS-232 messages only
see below
Leak Rate Period
Refer to How To Determine the Leak Rate, page 280
Select Format
Applies to RS-232 messages only
see below
Table 77: Chapter References for Miscellaneous Messages
Optional Checksum
The 146 unit can communicate with a host computer with or without using checksum bytes. The
checksum is the sum of all the ASCII values in the message. It includes all characters in the
message; from the “at” character (@) through the carriage return (CR). The checksum itself is
not calculated into the checksum value.
When the checksum is enabled, the 146 unit expects to receive a checksum for all incoming
messages. In return it sends a checksum value with each response. The checksum is sent with
the low byte first. The 146 unit is shipped with the checksum feature disabled.
Note
The number of data bits must be set to 8 when the checksum is enabled.
Refer to How To Configure the RS-232 Port, in Chapter Seven:
Operation in Setup Mode, for information on changing the
communication parameters.
The communication parameters on a displayless 146 unit cannot be
changed. Refer to Table 53, page 255, for a listing of the default
communication parameters.
Save To EEPROM Command
The 146 unit saves information to its EEPROM immediately upon receiving this command.
During front panel operation, the 146 unit saves the information when you exit either the Setup
or Tuning modes.
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