HFM-401/405 - Teledyne Hastings Instruments

half or full duplex; and jumper 5 is enabled when a hardware override of the baud rate (forcing it to9600) is desired. These functions are summarized in Figure 2-6.2.7.2. RS-485If RS485 is specified on the order, the flow meter isset to the default values: address 61, unterminated Txand Rx lines. While the default address is 61, allinstruments will respond to an address of FF.Hardware settings for RS-232 and RS-485 areenacted on 12 pin jumper field located on the left endof 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 areinstalled vertically over two pins when enabled andare numbered from left to right. Jumper 1 must beenabled for RS-485. Enabling jumpers 3 and 4 effecta 120 ohm resistance across the transmit and receivesignal pairs respectively. These should only beenabled in the last instrument on a long buss.Enabling jumper 6 forces the address to 99; this issometimes used when initiating communications.Figure 2-7 Web browser screen2.7.3. EthernetIf Ethernet is specified on the order, the flow meter has IPaddress 172.16.52.250 and communication port number10001. There are no hardware settings required or availableto modify the configuration. This IP address can be changedusing a web browser to access the configuration of theinstrument by typing the IP address into the URL section ofthe browser. Press OK to ignore the username/passwordscreen as shown in Figure 2-7. Select the new IP addressunder the network section of the web page configurationutility. If this address cannot be reached, the instrument canbe reconfigured by downloading and installing the LantronixDevice Installer routine from:http://www.lantronix.com/device-networking/utilitiestools/device-installer.html.A standard web browser cannot be used to send and receivemessages (such as flow readings) from the main processor ofthe flow meter. An Ethernet capable software program isrequired to communicate with the meter’s processor.Suitable examples of such programs are “Hyperterminal”(typically installed as standard on PCs and shown in Figure2-8) or custom Ethernet capable software such as LabView ® .For more information see the Software Manual.Figure 2-8 Example Hyperterminal window2.8. Alarm Output ConnectionThe Hastings 400 Series flow meters include two software settable hardware alarms. Each is an opencollectortransistor functioning as a semiconductor switch designed to conduct DC current whenactivated. (See Figure 2-9.) These sink sufficient current to illuminate an external LED or to activate aremote relay and can tolerate up to 70Vdc across the transistor. The alarm lines and the alarm commonare galvanically isolated from all other circuit components. The connections for Alarm 1, Alarm 2 andAlarm Common are available as pins 10, 11, and 12 respectively on the analog terminal strip (see QuickStart Guide on page iii).401-405 SERIES - 10 -