401-405 SERIES
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half or full duplex; and jumper 5 is enabled when a hardware override of the baud rate (forcing it to
9600) is desired. These functions are summarized in Figure 2-6.
2.7.2. RS-485
If RS485 is specified on the order, the flow meter is
set to the default values: address 61, unterminated Tx
and Rx lines. While the default address is 61, all
instruments will respond to an address of FF.
Hardware settings for RS-232 and RS-485 are
enacted on 12 pin jumper field located on the left end
of the top circuit board in the electronics enclosure.
Only the state of jumpers 1, 3, 4, and 6 affect the RS-
485 operation (see Figure 2-6). These jumpers are
installed vertically over two pins when enabled and
are numbered from left to right. Jumper 1 must be
enabled for RS-485. Enabling jumpers 3 and 4 effect
a 120 ohm resistance across the transmit and receive
signal pairs respectively. These should only be
enabled in the last instrument on a long buss.
Enabling jumper 6 forces the address to 99; this is
sometimes used when initiating communications.
2.7.3. Ethernet
If Ethernet is specified on the order, the flow meter has IP
address 172.16.52.250 and communication port number
10001. There are no hardware settings required or available
to modify the configuration. This IP address can be changed
using a web browser to access the configuration of the
instrument by typing the IP address into the URL section of
the browser. Press OK to ignore the username/password
screen as shown in Figure 2-7. Select the new IP address
under the network section of the web page configuration
utility. If this address cannot be reached, the instrument can
be reconfigured by downloading and installing the Lantronix
Device Installer routine from:
http://www.lantronix.com/device-networking/utilities-
tools/device-installer.html.
A standard web browser cannot be used to send and receive
messages (such as flow readings) from the main processor of
the flow meter. An Ethernet capable software program is
required to communicate with the meter’s processor.
Suitable examples of such programs are “Hyperterminal”
(typically installed as standard on PCs and shown in Figure
2-8) or custom Ethernet capable software such as LabView
®
.
For more information see the Software Manual.
2.8. Alarm Output Connection
The Hastings 400 Series flow meters include two software settable hardware alarms. Each is an open-
collector transistor functioning as a semiconductor switch designed to conduct DC current when
activated. (See Figure 2-9.) These sink sufficient current to illuminate an external LED or to activate a
remote relay and can tolerate up to 70Vdc across the transistor. The alarm lines and the alarm common
are galvanically isolated from all other circuit components. The connections for Alarm 1, Alarm 2 and
Alarm Common are available as pins 10, 11, and 12 respectively on the analog terminal strip (see Quick
Start Guide on page iii).
Figure 2-8 Example Hyperterminal window
Figure 2-7 Web browser screen
