National Instruments RS-485 manual


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Table of contents for the manual

  • Page 1

    FieldPoint ™ is a trademark of National Instruments Corporation. Product and company names are trademarks or trade names of their respective companies. 321698A-01 © Copyright 1997 National Instruments Corp. All rights reserved. July 1997 FP-1001 FieldPoint RS-485 Network Module Highlights • Isolated RS-485 interface to host computer or to FP-1[...]

  • Page 2

    2 The FP-1001 has a simple rail clip for mounting reliably onto a standard 35 mm DIN rail. To install the FP-1001 to the DIN rail, follow these steps: 1. With a flat bladed screwdriver, open the DIN rail clip to the unlocked position as shown in Figure 1. Figure 1. DIN Rail Clip 2. Hook the lip on the rear of the FP-1001 onto the top of a 35 mm DIN[...]

  • Page 3

    3 Figure 3. Installed Network Module Network Connection Connect the FP-1001 to a host computer, or to the RS-485 repeater port of an FP-1000, using the 5 position Combicon screw terminal adapter of the RS-485 connector on the FP-1001. You may connect up to 25 FP-1001 network modules to a single RS-485 port of a host computer, or up to 24 FP-1001 ne[...]

  • Page 4

    4 The RX+ of the host port (or FP-1000 RS-485 repeater port) must be connected to the TX+ of all of the FP-1001 modules, and the RX- of the host port (or FP-1000 RS-485 repeater port) must be connected to the TX- of all of the FP-1001 modules. This pair of connections provides communication to the host computer from the FP-1001 modules. These conne[...]

  • Page 5

    5 modules on different serial ports may have the same address. Every module on one serial port of a host computer must have the same baud rate. Figure 6. Address and Baud Rate Switch Switches 1-5 set the network address of the FP-1001. The addresses of the terminal bases connected to the network module are automatically configured to be sequentiall[...]

  • Page 6

    6 Switches 6-8 set the baud rate of the FP-1001. Table 2 shows the switch positions and the corresponding network baud rates. 40 170 50 180 60 190 70 200 80 210 90 220 100 230 110 240 120 Other Settings Not Allowed Table 2. Baud Rate Switch Settings Switch Positions 6-8 Network Module Baud Rate Switch Positions 6-8 Network Module Baud Rate 300 1920[...]

  • Page 7

    7 Powering the FP-1001 NOTE: Terminal bases must be connected to the FP-1001, and the baud rate switch must be set, before power is applied to the FP-1001. An 11-30 VDC power supply is required by each FieldPoint stack. The network module filters and regulates this supplied power and provides power for all the I/O modules in the stack. Therefore yo[...]

  • Page 8

    RS-485 isolation ............................... 2500 Vrms breakdown, 250 Vrms operational Power Consumption.......................... 1 W + 1.15 * ∑ (I/O module power requirements ) Operating Temperature ..................... -40 °C to +70 °C Storage Temperature ......................... -55 °C to + 100 °C Relative Humidity .................[...]