INFICON Cygnus 2 Thin Film Deposition Controller - Manual (Page 153)

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Cygnus 2 Operating Manual
9.3 Message Format
The Standard message protocol serves as a structure for the contained command
or response information. It also can provide a level of acknowledgment between
the host and server and a mechanism for verifying the information content. The
Cygnus 2 supports the following RS-232 protocols: Standard, Dlog Comma and
Dlog Page. The Dlog protocols only provide for one-way transmission of layer data
from the Cygnus 2.
Hardware handshaking is not supported.
Remote Communications parameters are set up in the General screen Comm
page.
NOTE: Communication returns "can not do now", Response Error "F", 0x46, when
Source Maintenance mode is enabled.
TCP/IP will always operate using the Standard protocol command set. It is not
affected by the RS-232 Protocol selection.
9.3.1 Protocol
Key:
<> . . . . . . Enclosed element further defined below (or above, if repeated use)
() . . . . . . . Optional Element
I . . . . . . . Or
x...x. . . . . One or more of x included
9.3.1.1 Command Packet (Host to Cygnus 2 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>)