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Cygnus 2 Operating Manual
9.3.1.4 Timeouts
If more than 3 seconds pass between characters of a command packet, Cygnus 2
will time out. No response packet is sent, Cygnus 2 will clear its buffers and assume
any future characters are the beginning of a new packet.
9.4 Communication Commands
The following only include the command portion of the command packet and the
response portion of the response packet. The headers/trailers are assumed. (See
section 9.3.1, Protocol, on page 9-5 for their definition.)
General definitions
<Float> = 4 byte, single precision ANSII standard floating point, low end first
<Integer> = 4 byte, signed integer, low end first
<String> = variable length, null terminated ASCII characters.
9.4.1 Query and Update Commands
Query commands are used to request established parameter values. There is a
specific query command for each parameter group. Depending on the actual
hardware configuration, the response to some Query commands may be an E error
code indicating there is no data available. Each command has one to three
arguments.
Update commands are used to change a specified parameter to a new value or
condition. Some parameters are order dependent in that they cannot be updated
prior to certain other parameters. There is a specific update command for each
parameter group.
The command variations include:
Table 9-2 QUERY and UPDATE commands
QUERY command Parameter UPDATE Command
QC Source Parameters UC
QG General Parameters UG
QI Input Name UI
QL Logic Statements UL
QM Material Parameters UM
QN Material Name UN
QO Output Name UO
QP Process
Layer Parameters UP
QS Process Sensor Parameters US
QT Output Type UT
QV User Message UV
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