DH Instruments PPCH, Operation And Maintenance Manual

Page: 117 / 192

4. REMOTE OPERATION
Page 107 © 2009 DH Instruments, a Fluke Company
COM2
Purpose Read or set the RS232 settings for the COM2 port.
Command
Query
“COM2 baud,parity,data,stop ”
“COM2?”
Classic “COM2= baud,parity,data,stop ”
“COM2”
Arguments baud : The baud rate. This may be ‘300’, ‘600’,’1200’,’2400’,’4800’, ‘9600’ or ‘19200’.
parity : The data parity. This may be ‘O’ for odd, ‘E’ for even, or ‘N’ for none.
Data: The number of data bits. This may be ‘7’ or ‘8’.
stop : The number of stop bits. This may be ‘1’ or ‘0’.
Defaults “COM2 2400,E,7,1”
Remarks COM2 is generally used to connect
DHI
RPM4 external measurement devices. The COM2
port can also be used to allow the host computer to communicate through the PPCH to an
additional device connected to COM2. This can be useful if the host computer does not have
2 serial ports available.
Example
(enhanced)
Cmd sent:
Reply:
“COM2 9600,N,8,1”
“9600,N,8,1” (No reply if GPIB-488)
Example
(enhanced)
Cmd sent:
Reply:
“COM2? 9600,N,8,1”
“9600,N,8,1”
Example
(classic)
Sent:
Reply:
“COM2=9600,N,8,1”
“9600,N,8,1”
Errors ERR# 7: Missing or improper program message argument(s).
See Also “#”, “PASSTHRU”
3.5.2.1, 4.2.1.3
DATE
Purpose Read or set the PPCH date.
Command
Query “DATE date ”
“DATE?”
Classic “DATE= date ”
“DATE”
Arguments date : The date in the numerical only format YYYYMMDD or YYMMDD with no
spaces or separators.
Remarks The PPCH has an internal real time calendar clock. It is used for date stamping calibrations.
The reply is always in the YYYYMMDD format.
Example
(enhanced) Cmd sent:
Reply: “DATE 20030115”
“20030105”
(No reply if GPIB-488)
Example
(enhanced) Cmd sent:
Reply: “DATE? 20030105”
“20020105”
Example
(classic) Sent:
Reply: “DATE=021201”
“20021201”
Errors ERR# 7: Missing or improper program message argument(s).
See Also “TIME”
3.5.5.3
DF
Purpose Decrease the pressure quickly.
Command “DF n ”
Classic “DF= n ”
Arguments ‘0’
‘1’
Stops the pressure generation.
Starts a descending generation at a fast fixed rate..
Remarks The down control valve is used to establish a fixed rate of 2% FS/sec. The valve is closed as
the pressure approaches the target.
Example
(enhanced) Cmd sent:
Reply: “DF 1”
“1”
(no reply if IEEE-488)
Example
(enhanced) Cmd sent:
Reply: “DF? 1”
“1”
Example
(classic) Sent:
Reply: “DF=1”
“DF=1”
Errors ERR# 6:
ERR# 55:
The n argument is a ‘0’ or a ‘1’.
Hardware malfunction, low reservoir
See Also “IF” , “DS”, “IS”, “IP”, “DP”,
3.2.1