SP Scientific ULTRA-COOL, Руководство оператора

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Ultra-Cool RS-232 Programmer’s Reference
Rev 008, 01/12 35
© SP Scientific 2012
Parametric Command 2.
A parametric command describes a function/command for which a value must
be specified. The command characters must be followed by an "equals sign"
("=") (ASCII 061 decimal / 3D hex), and a data string of decimal value.
The value may optionally contain a decimal point (except where required to
define decimal fractions). Negative values require a "minus sign" ("-", ASCII
045 decimal / 2D hex) between the "equals sign" and the value. A plus sign
("+") may be used, but is not required.
Each programmable value within the system is assigned a set of limits by the
system. Certain of these limits may be further modified by other program
commands. Values which exceed the boundaries of either of these limits will
result in an error.
The number of characters attached to the "value" field may not exceed eight;
an error will result accordingly. Leading zeroes, or trailing zeroes behind a
decimal point, may be added without effect, up to the character limit.
Examples
SP=20
;Adjust Setpoint to 20 degrees

SP=+20.
;Adjust Setpoint to 20 degrees

SP=020.00
;Adjust Setpoint to 20 degrees

SP= 60.3
;Adjust Setpoint to 60.3 degrees

CPB=3.6
;Adjust Cooling Proportioning Band to 3.6 degrees

Controllable features which are not system "program parameters", such as
switches, use the values "0" to represent "off" and "-1" to represent "on" (byte
false = $00 = 0, byte true = $FF = -1).
Examples
PUMPSW=-1
;Turn pump switch on

PUMPSW=0
;Turn pump switch off

Query Command (request for information) 3.
A request for information from the MPC to the host is an absolute command.
However, all commands which expect data in reply to the command end with
a question mark ("?"). The format of the reply is defined below (under
"Transmitted Data"). With few exceptions, the query command replicates the
mnemonic for the corresponding parametric command, merely substituting
the "?" for the "=" in the string.