INFICON XTC/3 Thin Film Deposition Controller Operating Manual - Manual (Page 118)

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XTC/3 Operating Manual
5.2 Standard Protocol Message Format
This message format is in effect if Standard has been selected under
the RS-232 Protocol parameter and is always in effect for the TCP/IP port.
All messages are comprised of serial byte information. The byte values represent
command or response characters, control characters, or numeric values.
Mnemonics will be used to describe portions of each message format.
NOTE: These mnemonics are not part of the message stream; they are used
to represent specific ASCII codes, characters or numeric values that
comprise the message stream.
5.2.1 Standard Protocol
Key:
<> . . . . . . . . . . . . . . . . . . . . . . . . Enclosed element further defined below (or
above, if repeated use)
() . . . . . . . . . . . . . . . . . . . . . . . . . Optional Element
I . . . . . . . . . . . . . . . . . . . . . . . . . Or
x...x. . . . . . . . . . . . . . . . . . . . . . . One or more of x included
5.2.1.1 Standard Command Packet (Host to XTC/3 Message)
<length><message><checksum>
Length . . . . . 2 bytes Low / High (not including checksum or length bytes).
Numeric value from 0 to 57,800 (two bytes) representing the
number of characters in the command. In order of transmission, the
low byte will precede the high byte. For most commands, the
number for characters will be less than 256.
In this situation the low byte will contain the character count while
the high byte will have zero value.
Message. . . . . . . . . . . . . . . . . . . . . . <Command>(<Command>...<Command>)
Command = <Command Group> (<Command Sub-group>) (<Command ID>)
(<Parameter>...<Parameter>)
Command Group = 1 ASCII byte, specifying category of command:
E - Echo
H - Hello
Q - Query
R - Remote action
S - Status
U - Update