CRESTRON Contents CNX RS-232/422/485 Expansion Card: CNXCOM-2 1 Description .......................................................................................................................... 1 Functional Description ........................................................................................... 1 Physical Description............................................................................................... 2 Leading Specifications ..................................................
CRESTRON CNX RS-232/422/485 Expansion Card: CNXCOM-2 Description Functional Description The CNXCOM-2 RS-232/422/485 Expansion Card provides RS-232, RS-422, or RS-485 communication with hardware and software handshaking. Speeds are rated up to 38,400 bps. In fact, a variety of communication parameters are support. Valid parameters are as follows. • Baud rates may be one of the following possible rates: 300, 600, 1200, 2400, 4800, 9600, 19200, and 38400.
CRESTRON Physical Description The CNXCOM-2, shown below, is a circuit board fastened to an aluminum faceplate. The card is manufactured to easily fit into an unoccupied slot in a Crestron CNX Generation Control System. CNXCOM-2 Faceplate The faceplate contains two identical bidirectional DB9 male connectors. Silk screening is applied to the faceplate; connectors are labeled A and B. Leading Specifications The table below provides a summary of leading specifications for the CNXCOM-2.
CRESTRON 1. Disconnect power from the CNMSX. 2. Use the Phillips tip screwdriver and remove two screws and blank faceplate from the control system. 3. Align the CNXCOM-2 with the card guides in the open slot and slide the expansion card into postion. 4. Firmly press both ends of the CNXCOM-2 faceplate to seat the expansion card into the control system connector. 5. Tighten the thumb-nail screws to secure the CNXCOM-2 to the control system. 6. Reapply power to the CNMSX.
CRESTRON A common application is to use a three-wire null modem serial cable to communicate with a PC, shown below. Since the pinout on the CNXCOM-2 is nonstandard, the card should not be plugged into the PC directly. The pinout in this illustration emulates the IBM PC AT connector except for the RS-422 signals on pins 1, 4, 6, and 9.
CRESTRON How the Program Works A basic CNXCOM-2 SIMPL program is shown on the next page in block diagram form. For this example, the CNXCOM-2 occupies slot #1 of a CNMSX-PRO. Assume that a touchpanel is used to control the state of Zone 1 in a lighting system. Zone 1 can either be turned ON or OFF or can be ramped UP or DOWN. Block Diagram of CNXCOM-2 To turn the lights on, 9 bytes are sent (\x02Z-01-ON\x03). When join #1 on the touchpanel is pressed, the signal "Lights-Z1-On" goes high.
CRESTRON version can be obtained from the Software Downloads page of Crestron’s website (www.crestron.com). New users are required to register in order to obtain access to the FTP site. Graphical System View of CNXCOM-2 and CT-3500 in SIMPL Windows’ Configuration Manager The lighting system communicates with port A of the CNXCOM-2 over RS-422 with 38400 N81 settings. These preferences for the port are set up in the Configuration Manager.
CRESTRON Graphical Detail View of Touchpanel in SIMPL Windows’ Programming Manager Expand the Central Control Modules and Slot-01 folders. Double click on the Port A icon for a detail view (alternatively CTRL+D or drag and drop into Detail View). Assign signals as shown below. Graphical Detail View of CNXCOM-2 in SIMPL Windows’ Programming Manager In this example, all commands are suffixed with the hex byte \x03. To save some typing, \x03 can be entered as the delimiter in the CNXCOM-2 Port A symbol.
CRESTRON Graphical Detail View of a NOR in SIMPL Windows’ Programming Manager Problem Solving Troubleshooting The table below provides corrective action for possible trouble situations. If further assistance is required, please contact a Crestron technical support representative. CNXCOM-2 Toubleshooting TROUBLE CNXCOM-2 does not function. POSSIBLE CAUSE(S) CORRECTIVE ACTION CNX Control System is Verify power to CNX Control System. not receiving power.
CRESTRON Return and Warranty Policies Merchandise Returns / Repair Service 1. 2. 3. No merchandise may be returned for credit, exchange, or service without prior authorization from CRESTRON. To obtain warranty service for CRESTRON products, contact the factory and request an RMA (Return Merchandise Authorization) number. Enclose a note specifying the nature of the problem, name and phone number of contact person, RMA number, and return address.
