Ashcroft ATE-100 Handheld LCD Digital Calibrator - Manual (Page 39)

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Revision 4.6 3/2004
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Deadband
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ENT
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Section 19.0 RS232 Interface General Information
To simplify the interface of the HHC with your com-
puter, recorder, data acquisition hardware or dumb
terminal two standard operating modes for the RS232
interface are available. A third RS232 operating mode,
ISO1745, is included on the menu options. This mode
is only used in uploading data from the optional data
logging memory and in factory calibration, set up and
repair activities.
To configure the RS232 interface on the HHC for the
requirements of your input device, first determine the
interface requirements of the device. Then using the
RS232 setup feature configure the RS232 interface on
the HHC, following the steps below:
Pin out information follows. A standard RS232 cable,
to connect the calibrator to a 9 pin serial port on a
computer, is available from your calibrator supplier.
An adaptor to connect the calibrator to a 25 pin serial
connection on a computer is also available. The RS232
connector is located above the AC adapter input on the
right side of the calibrator when looking down at the
calibrator with the keypad up in the normal operating
orientation.
RS 232 Connector
Pin Function
1 Relay 1 common (for alarm option)
2 Transmit data
3 Read data
4 Data set ready
5 Ground
6 Data transfer ready
7 Relay 1 normally open (for alarm option)
8 Relay 2 common (for alarm option)
9 Relay 2 normally open (for alarm option)
Section 19.1 Configuring RS232 Interface for Use
with a Dumb Terminal
To communicate with the HHC through the use of a
dumb terminal set the terminal up as follows:
Select baud rate to be used: 300, 1200, 2400 or 9600
Select communications (com) port: 1 or 2
Set data bits to: 8
Set stop bits to: 2
Set parity to:
none
Flow control: none
Section 19.2 RS232 Configuration Options
The HHC has two communication formats for operator
use. These communication formats will appear as selec-
tion options during the set up of the RS232 interface. A
third mode of RS232 communication, ISO1745, is listed
in the menu selections and is only used for up loading
data stored in the optional data logging memory to a
computer and factory calibration, setup and repair activi-
ties. An overview of the features of these formats follows.
Section 19.2.1 RS232 Interface ISO1745
Operating Mode Overview
The ISO1745 mode of operation is used to interface the
HHC with the upload program provided to export data
logged values into a P.C. compatible computer. If your
calibrator is equipped with the optional data logging
capability, consult Section 24 of this manual and supple-
mental manual provided with the software package for
directions on the use of the ISO1745 mode for data trans-
fer to an IBM compatible personal computer. Units not
equipped with the data logging option are not supplied
with the upload program disk or supplemental manual.
Section 19.2.2 RS232 Interface Journal Mode
Overview
This mode allows the HHC to be interfaced to an RS232
compatible printer or other device where a steady,
timed data output is required. When the journal mode
is selected the HHC will transmit the current pressure
measurement(s) as shown below:
+0.005 in.H
2
O +0.0000 psi
Left Min: +0.0045 Max: +0.0053
Right Min: +0.0000 Max: +0.0000
+0.003 in.H
2
O +0.0000 psi
Left Min: +0.0032 Max: +0.0049
Right Min: +0.0000 Max: +0.0000