INFICON SRT-422 Crucible Indexer - Manual (Page 54)

Page 52 RS-232 Interface
Section 4.4: ASCII Protocol
The SRT does not initiate any messages on its own. It responds only when “spoken” to
. The format of the ASCII protocol used to send a message to the SRT is as follows:
$byte (byte) (byte...byte)CR
The ‘$’ is the start of a message. A single ASCII character is a byte. Either a space or
comma separates different parameters in the command. Parameters can have multiple bytes.
No space or comma separator exists between the ‘$’ and the first byte or the last byte and the
CR. The number of parameters in a message depends on the command. A CR terminates the
message. In the following paragraphs the CR (Carriage Return) or, optionally, the CR LF will
be designated by <cr>.