Nor-Cal Intellisys Adaptive Pressure Controllers - Manual (Page 16)

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6.0 - RS-232 Serial Interface and Commands
Interface basics
All APC controllers support RS-232 serial communications available though one or more interface ports. A full description of the communications protocol and
a listing of all active serial commands follows in this section. But first, a three-wire connection needs to be completed to provide the communications lines, with
Rxd (data from the APC), Txd (data to the APC) as well as signal common on.
NOTE: Hardware handshaking is not available.
NOTE: The default factory RS-232 communications parameter settings are 9600 Baud, 1 stop bit, no parity and 8-bit character.
These settings can only be changed on models with DIP switches, and changing the setting requires cycling APC input power off then back on.
Every serial input command sent by the HOST has an end-of-line delimiter, carriage return ASCII 0x0D [hex], or the line feed character ASCII 0x0A [hex],
or the carriage return and line feed character in that order. The APC-device end-of-line delimiter is the carriage return and line feed characters.
Serial Commands Summary
Table 6.1 and 6.2 summarize the serial commands and responses available with the APC controller. Additional commands
may be included to enable customer specific functions. Please contact Nor-Cal Products Intellisys Customer Support for more details.
TAbLE 6.1 – RS-232 SERIAL COmmANDS
SerIAl
commAnD DeScrIPtIon
noteS /
exAmPleS
C Close the valve Same function as pressing the CLOSE button
O Open the valve Same function as pressing the OPEN button
H Hold the valve in the current position Stops active pressure control, if device is in that mode
T1x
Sets the type of set point #1. When x=0, the set-point type is position.
When x=1, the set-point type is pressure.
S1xx.xx
Used to program a value for set point xx.xx is any number between 0.00 and
100.00, representing the % of gauge full scale
S150, for example, programs the value of 50% for the setpoint. When using
a 1 Torr gauge, this corresponds to 500 mTorr..
D1 Activates set-point #1. Put the device in control mode, effectively making the setpoint active.
Vxx.xx Go to valve position xx.xx is 0 to 100% of full open
L0 Auto select CDG1 or CDG2 for best resolution Default two gauge configuration.
L1 Control to and report CDG1 values only Selects Gauge 1 for manitenance function.
L2 Control to and report CDG2 values only Selects Gauge 2 for manitenance function.
N1xx Sets the full scale range of CDG1 Values for xx can be found in Table 6.3
N2xx Sets the full scale range of CDG2 Values for xx can be found in Table 6.3
JC
Clears the “initialization safety lock feature” included on some TPV and TSS
controllers
Initializes Valve
RS-232 Commands Examples
The following section provides examples of the most commonly used commands and responses. The APC serial command protocol is not case sensitive, though
all the command examples in this section are listed in capital letters. Furthermore, whenever necessary the character Ø has been used to designate the number
zero, so as to not confuse it with the letter O.
TAbLE 6.2 – RS-232 SERIAL REqUESTS AND RESPONSES
SerIAl
reQueSt DeScrIPtIon reSPonSe
R1 Requests the set point value S1 + xx.xx, where xx.xx is a number from 0.00 to 100.00
R5 Requests the current pressure P+xx.xx, where xx.xx is a number from 0.00 to 100.00
R6 Requests the current valve position V +xx.xx, where xx.xx is a number from 0.00 to 100.00
R38 Requests the software version APC3-[version #] [version date]
R26 Report set point type
T1x, When x=0, the set-point type is position. When x=1, the set-point type
is pressure.
GSN Get the serial number of the device Serial nb xxxxxx
RN1 Requests full scale range of CDG1 N1xx.xx, where xx.xx is the full scale range of CDG1
RN2 Requests full scale range of CDG2 N2xx.xx, where xx.xx is the full scale range of CDG2
RESET Resets the device Same as cycling power