Alicat PCU Portable Calibration Unit - Manual (Page 13)

13
RS-232 Output and Input
Connect the male RS-232 DB9 port (See Fig. 1) of the PCU to the serial port of your computer or data
logger. This will normally require a female/female DB9 cable (included).
One of the most common ways to access the RS-232 output from your PCU is through a simple terminal
program. Open your Hyperterminal RS-232 terminal program (installed under the “Accessories” menu
on all Microsoft Windows operating systems). Select “Properties” from the file menu. Click on the
“Configure” button under the “Connect To” tab. Be sure the program is set for: 19200 baud and an
8-N-1-None (8 Data Bits, No Parity, 1 Stop Bit, and no Flow Control) protocol. Under the “Settings” tab,
make sure the Terminal Emulation is set to ANSI. Click on the “ASCII Setup” button and be sure the
“Send Line Ends with Line Feeds” Box is not checked, and that the “Append Line Feeds to Incoming
Lines” box is checked. Those settings not mentioned here are normally okay in the default position.
Type L, M or H to read data for the desired range.
When the queried the window will fill with 6 columns of data representing the range (L=Low, M=Medium,
H=High), absolute pressure, temperature, volumetric flow, mass flow, and selected gas respectively.
Pressure units are PSIA, temperature units are Degrees C, volumetric flow units are Liters Per Minute,
and mass flow units are Standard Liters Per Minute. The Low range is 0-2 SLPM, the Medium range is
0-50 SLPM, and the High range is 0-1000 SLPM.
L +014.70 +025.00 +02.004 +02.004 AIR
L +014.70 +025.00 +02.004 +02.004 AIR
L +014.70 +025.00 +02.004 +02.004 AIR
L +014.70 +025.00 +02.004 +02.004 AIR
L +014.70 +025.00 +02.004 +02.004 AIR
L +014.70 +025.00 +02.004 +02.004 AIR
PCU Mass Flow Meter Data Format
(Low Range)
Note: On units with the totalizer function the sixth column will be the totalizer value, with gas select
moving to a seventh column.