DR 4500A Circular Chart Recorder Kit Instruction RS485 Modbus Communications Printed Circuit Board Kit (Part Number )

Transcription

1 DR 4500A Circular Chart Recorder Kit Instruction RS485 Modbus Communications Printed Circuit Board Kit (Part Number ) Form: Effective: 2/2015 Supercedes: 5/1998 Summary Enclosed with this instruction is a new Modbus Communications printed circuit board for your DR4500A Recorder (Classic or Truline models). Use the procedures listed in the tables to install and configure the Modbus Communications Printed Circuit board. These procedures assumes that you are familiar with the DR4500A recorder. We suggest that you have a copy of the recorder's product manual on hand for reference. WARNING Never access components inside the case with the power applied. CAUTION When handling electronic assemblies, care should be taken to avoid damage by electrostatic discharge. Use a wrist strap connected to an earth ground before withdrawing the printed circuit board from its container and installing it into the recorder. Kit Contents This kit contains parts to add Modbus Communications to your DR4500A recorder. You kit you have received contains the following parts: Part Number Description Modbus RTU Communications PCB Card Guide (2) Terminal Block - 2 Position Tie Wraps (2) NOTE: You may wish to change or add Table III in your recorder s model number to equal 3XX to show that the recorder is equipped with the Modbus RTU Communication function. Form Modbus Communications Kit Instruction Page 1 of 5

2 Modbus Communications PCB Installation Installation Procedure Follow the steps listed in Table 1 to add the Modbus Communications printed circuit board. The procedure assumes that the chart door is open, the chart plate is swung out, and the power is removed. Table 1 Adding a Modbus Communications PCB Step Action 1 Install the new card guides supplied with the kit into proper location on the motherboard located in the left hand side of the case. (See Figure 1 for Auxiliary Output/Modbus card location) CAUTION Install the guides with a steady pressure. Excessive rocking will destroy its latch. 2 Slide the new Modbus board into the card guides and press in firmly to seat the connector onto the motherboard. 3 Locate connector J3 near the top of the Auxiliary Output/ Modbus printed circuit board (See Figure 1 for location). 4 Run the output wires through the desired knockout. 5 Strip 1/4-inch maximum of insulation from the end of each wire. 6 Loosen the screws in terminals on the plug connector supplied in the kit and position the plug as you would to plug it into J3 on the Auxiliary Output/Modbus board. 7 Observing the polarity, insert the wires into the appropriate screw clamps. Tighten the screws to secure the wires. 8 Install the wired plug into J3 9 Configure the recorder for Modbus Communications. Refer to Table 2 and 3. For information concerning Modbus Communications, refer to Manual # and Form Modbus Communications Kit Instruction Page 2 of 5

3 Auxiliary Output Installation, Continued Installation Procedure, continued Figure 1 shows the location of the Auxiliary Output/Modbus components. Figure 1 Auxiliary OutputModbus Components Form Modbus Communications Kit Instruction Page 3 of 5

4 MOdbusConfiguration Enable Modbus Communications The procedure to enable Modbus Communicationsis listed in Table 2. Table 2 Procedure for Enabling Auxiliary Output Step Operation Press Action/Result 1 Access the COMM Set Up group 2 Access the Modbus Prompt 3 Select SET UP FUNC or SET UP COMM DISABL 4 Configure the other parameters FUNC or to access each parameters. See Table 3 for available parameter selections and definitions. To make your selections for each parameter 5 Return to normal operation LOWR DISP to return to normal operation. Form Modbus Communications Kit Instruction Page 4 of 5

5 Modbus ComunicationsConfiguration, Continued Parameter selections Table 3 lists all the function prompts in the Modbus Communications set up group and their functions. Table 3 Modbus Communications Group Definitions Prompt Range of Setting or Selection DISABL Parameter Definition DISABL Disables the communications option. Allows Modbus communication prompts. Com ADDR 1 to 99 COMMUNICATIONS STATION ADDRESS This is a number that is assigned to the recorder that is to be used with the coption. BAUD XMT DLAY NONE 10MSEC 20MSEC 30MSEC 40MSEC 50MSEC BAUD RATE is the transmission speed in bits per second. 300 Baud 600 Baud 1200 Baud 2400 Baud 4800 Baud 9600 Baud Baud TRANSMIT DELAY This is the approximate time delay between receipt of Modbus request message and start of response message (in addition to message processing time). Form Modbus Communications Kit Instruction Page 5 of 5