14644_ins_comblk Mounting,Termination and Troubleshooting Communications Cable Terminal Block (BA/COMBLK) Building Automation Products, Inc., 750 North Royal Avenue, Gays Mills, WI 54631 USA Tel:+1-608-735-4800 • Fax+1-608-735-4804 • E-mail:sales@bapihvac.com • Web:www.bapihvac.com 1 of 2 Specifi cations subject to change without notice. rev. 05/10/13 Overview The COMBLK - Communication Cable Terminal Block is a small circuit board de- signed to simplify the task of terminating communications wiring. The COMBLK fi ts into the TRK18 snaptrack or any other industry standard 2.75” snaptrack. Each COMBLK contains four independent circuits with three connectors - one for bus in, one for bus out and a third for wiring to the controller. The COMBLK allows each bus to be quickly isolated and tested in each direc- tion to simplifying the troubleshooting of communications problems. A common ground connector provides a convenient means of grounding all shield drain wires. The COMBLK also accommodates the COMSRG surge suppressor, which plugs directly inline between the COMBLK and the communications bus segment. The COMBLK is suitable for RS-485, Modbus, Echelon ® , or virtually any other com- munications standard that talks over two or three wires. Echelon®, LONWORKS®, Neuron®, and 3120® are trademarks of Echelon Corporation registered in the United States and other countries. The COMBLK mounts in a piece of snaptrack as shown in Fig. 1. Note: The COMBLK may be mounted 90 degrees to what is shown in Fig. 1. Fig. 1: COMBLK mounted in snaptrack. Mounting14644_ins_comblk Mounting,Termination and Troubleshooting Communications Cable Terminal Block (BA/COMBLK) Building Automation Products, Inc., 750 North Royal Avenue, Gays Mills, WI 54631 USA Tel:+1-608-735-4800 • Fax+1-608-735-4804 • E-mail:sales@bapihvac.com • Web:www.bapihvac.com 2 of 2 Specifications subject to change without notice. rev. 05/10/13 Jacks J1, J5 and J9 make up Circuit A. All three connector’s pin 1s are connected together, all three connector’s pin 2s are connected together and all three connector’s pin 3s are connected together; additionally, all twelve connector’s (J1 through J12) pin 4s are connected together. Terminal jacks in each communication circuit and their suggested usages are shown in table 1. Suggested pin usage is shown in table 2. A wire connected to a good earth ground should be connected to 1/4 inch quick connect J17. Note: The male connectors that plug into the jacks on the board use a rising block screw terminal to hold the wires. It is possible for the block to be in a partially up position allowing the wire to be inserted under the block. Be sure that the male connector screws are turned fully counterclockwise before inserting the wire. Lightly tug on each wire after tightening to verify proper termination. Note: Best practice is to pick a wiring standard and stick with it for all subsequent terminations. For example; if you have three wires plus shield in your communications cable always wire the same color wire to the same terminal. Termination Diagnostics Specifications Possible Problem: Controller cannot talk on bus Possible Solutions: - Make sure that the connections are all in the same communications circuit. - Make sure that polarity is correct on the two communication wires. There are four independent circuits on the COMBLK. Circuit 1 will be described, Circuits 2, 3 and 4 are identical. Fig. 2: COMBLK component identifier Note: Pin numbers are only shown for J5. Pin numbers for all other jacks (J1 through J12) are identical. Wire Size: 16 to 22 gauge Communication Connectors Used AJ9 (Bus input), J5 (Controller), J1 (Bus out) BJ10 (Bus input), J6 (Controller), J2 (Bus out) CJ11 (Bus input), J7 (Controller), J3 (Bus out) DJ12 (Bus input), J8 (Controller), J4 (Bus out) Table 1: Communications Block Wiring Connector Pin Circuit FunctionSuggested Wire Color 1Comm A (+)Red 2Comm B (-)Black 3Signal Ground (if needed)White 4Communication Cable ShieldShield Table 2: Suggested Connector WiringNext >