Crestron CNXCOM-2 User manual

CRESTRON
Operations Guide - DOC. 8123 Contents •• i
Contents
CNX RS-232/422/485 Expansion Card: CNXCOM-2 1
Description ..........................................................................................................................1
Functional Description ...........................................................................................1
Physical Description...............................................................................................2
Leading Specifications.........................................................................................................2
Setup....................................................................................................................................2
Installation.............................................................................................................2
Preparation for Use................................................................................................. 3
Programming with SIMPL™ Windows.............................................................................4
How the Program Works ........................................................................................5
How to Create the Program.....................................................................................5
Problem Solving...................................................................................................................8
Troubleshooting .....................................................................................................8
Further Inquiries ....................................................................................................8
Return and Warranty Policies............................................................................................... 9
Merchandise Returns / Repair Service .................................................................... 9
CRESTRON Limited Warranty..............................................................................9

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Operations Guide - DOC. 8123 CNX RS-232/422/485 Expansion Card: CNXCOM-2 •• 1
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.
•Parity may be even, odd, none, or zero stick (parity bit always 0).
When specifying the parity use E, O, N, or Z, respectively.
•Data bits may be 7 or 8.
•Stop bits may be 1 or 2.
•Both XON/XOFF handshaking and RTS/CTS handshaking are
supported. XON/XOFF handshaking may be supported by specifying
XON (for both transmit and receive), XONR (for receive only), or
XONT (for transmit only). XON/XOFF and RTS/CTS handshaking
are mutually exclusive in the CNXCOM-2. If both are enabled,
RTS/CTS is used. If CTS handshaking is enabled, the CTS line is
monitored by the CNXCOM-2. The CTS line can also be enabled as a
digital input to the control system; the RTS line can be enabled as a
digital output.
•Specify RS422 for standard if RS-422 compatible levels must be
supported.
•Break character of any length can be generated.
•Supports RS-485. However, a specific protocol for defining the
mechanism as to when a device is permitted to transmit on the RS-485
bus must be followed. To use this feature, use RS-422 communications
settings. Set hardware handshaking to none. The RTS output can now
be used to enable the transmitter. Notice that the receiver is always
active. Therefore, transmissions are also received.

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2•• CNX RS-232/422/485 Expansion Card: CNXCOM-2 Operations Guide - DOC. 8123
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.
Dimensions and weight are approximations rounded to the nearest hundredth unit.
Leading Specifications of the CNXCOM-2
SPECIFICATION DETAILS
Power Requirements 24 VDC, network power; 4 Watts
SIMPL Windows Version 1.20.04 or later
CNX Operating System Version 5.01.21X or later
CNX Monitor Version 2.05X or later
Dimensions
Height: 0.98 in (2.49 cm)
Width: 5.00 in (12.70 cm)
As of the date of manufacture, the unit has been tested and found to comply with
specifications for CE marking.
Setup
Installation
Items required to install the CNXCOM-2 are already attached to the unit. The only
tools required are a Phillips tip screwdriver and a grounding strap. Follow the
assembly procedure after this paragraph.
CAUTION: The CNXCOM-2 contains electrostatic sensitive devices (ESD);
observe precautions for handling ESDs to avoid damaging the card.
NOTE: If installing the CNXCOM-2 into a CNMSX-AV, it is assumed that the
CNXCAGE has been installed.

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Operations Guide - DOC. 8123 CNX RS-232/422/485 Expansion Card: CNXCOM-2 •• 3
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.
Preparation for Use
Two distinct bidirectional serial ports are available from the CNXCOM-2 via two
non-standard DB9 connectors. Refer to a sample hookup diagram below and aside
from reapplying power to the control system last, complete the connections in any
order.
Sample Hookup Connections for CNXCOM-2
SERIAL
DEVICE
NOTE: The pinout of each 9-pin port is non-standard, therefore use of a straight-
through cable is not appropriate. The table following this note contains pinout
descriptions for RS-232 as well as RS-422. Conflicts with some equipment may
occur unless the controlled devices are properly wired. Certain devices have specific
voltage requirements. Therefore, do not use all nine pins in a given application.
Although the possibility is remote, improper wiring may result in damage to the
controlled device. Only the required pins for each communication type should be
connected.
Non-Standard COM Pinout (for RS-232 and RS-422 Communication)
PIN DIRECTION DESCRIPTION
1* To CNXCOM-2 (RXD-) RS-422 Receive Data (Idles low)
2To CNXCOM-2 (RXD) RS-232 Received Data
3From CNXCOM-2 (TXD) RS-232 Transmitted Data
4From CNXCOM-2 (TXD+) RS-422 Transmit Data (Idles high)
5RS-232 and RS-422 Signal Common
6To CNXCOM-2 (RXD+) RS-422 Receive Data (Idles high)
7From CNXCOM-2 (RTS) RS-232 Request to Send
8To CNXCOM-2 (CTS) RS-232 Clear to Send
9From CNXCOM-2 (TXD-) RS-422 Transmit Data (Idles low)
Where: * = RS-422 transmit and receive are balanced signals requiring two lines plus a ground in each
direction. RXD+ and TXD+ should idle high (going low at start of data transmission). RXD-
and TXD- should idle low (going high at start of data transmission). If necessary, RXD+/RXD-
and TXD+/TXD- may be swapped to maintain correct signal levels.

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4•• CNX RS-232/422/485 Expansion Card: CNXCOM-2 Operations Guide - DOC. 8123
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 non-
standard, 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.
Three-Wire Null Modem Serial Cable
9-PIN FEMALE
"D" CONNECTOR
TXD 3
RXD 2
GND 5
TO
CNXCOM-2
9-PIN FEMALE
"D" CONNECTOR
BLACK
WHITE
RED 3 TXD
5 GND
2 RXD TO
SERIAL
DEVICE
NOTE: To support RS-485, tie pin 1 (RXD-) to pin 9 (TXD-) and pin 4 (TXD+) to
pin 6 (RXD+) in the cable (refer to the table after this note).
COM Pinout to RS-485 Bus
COM (DB9) CONNECTOR RS-485 BUS
Tie Pins 1 & 9 +
Tie Pins 4 & 6 -
Pin 5 G
Programming with SIMPL™ Windows
SIMPL (Symbol Intensive Master Programming Language) is an easy-to-use
programming language that is completely integrated and compatible with all
Crestron system hardware. The objects that are used in SIMPL are called symbols.
SIMPL Windows offers drag and drop functionality in a familiar Windows®
environment.
SIMPL Windows is Crestron Electronics' software for programming Crestron
control systems. It provides a well-designed graphical environment with a number
of workspaces (i.e., windows) in which a programmer can select, configure,
program, test, and monitor a Crestron control system.
The next two subsections describe a sample SIMPL Windows program that utilizes
the CNXCOM-2. The first subsection details how the sample program works with a
textual description and block diagram. The second subsection provides a broad
description of how to actually create the SIMPL Windows program.
NOTE: The following description assumes that the reader has knowledge of
SIMPL Windows. If not, please refer to the extensive help information provided
with the software.
NOTE: There is no need to recreate the sample SIMPL Windows program. A copy
of this program is available from Crestron’s ControlCD (version 4.03 and later).
Search for the CNXCOM-2.SMW project in the SIMPL Windows Example Base.

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Operations Guide - DOC. 8123 CNX RS-232/422/485 Expansion Card: CNXCOM-2 •• 5
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. When this signal goes
high, the data is sent out the port to the lighting system. A similar approach is taken
for "Lights-Z1-Off". These buttons have true feedback from the lighting system
(i.e., when the 16 bytes (\x02Z-01-STATUS-ON\x03) enter the port, the digital
signal "Lights-Z1-On-F" goes high and drives the feedback of join #1 high). In turn,
this lights the feedback for the OFF button on the panel.
In order to ramp the zone, the appropriate command is sent to start the ramping
operation when the UP or DOWN button is pressed. When either button is released,
the output of the NOR gate goes high. This, in turn, sends the STOP command to
the lighting system, telling it to halt the ramping operation in progress.
It is important to note that the user does not have to define the [TX$] or [RX$] for
the port. If strings are being triggered and matched only in the port, the string
assignment is taken care of by the compiler. If the TX$ is defined, it can be driven
by other string creation symbols (i.e., an Analog to Serial or speed key: TXA). If
RX$ is defined, it can be routed to other string processing symbols (i.e. Serial
Gather or speed key: GATHER). Another typical usage would be if a macro were to
drive the port, then the TX$ and RX$ would come from/go to the macro definition.
Refer to the help file in SIMPL Windows. From the Contents search on Symbol
Card File or from the Index search on the names of the symbols for details.
How to Create the Program
Use the Configuration Manager workspace in SIMPL Windows to select and
configure all the devices that need to be included into the system. For this example,
add a CNXCOM-2 to slot #1 of the CNMSX-PRO. Also add a CT-3500 to the
system; its NET ID must be set to 03, shown on the next page.
NOTE: SIMPL Windows v1.20.04 or later is required to program the CNMSX-
PRO with a CNXCOM-2 card. If using an earlier version of SIMPL Windows,
Crestron recommends a SIMPL Windows and operating system upgrade. The latest

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6•• CNX RS-232/422/485 Expansion Card: CNXCOM-2 Operations Guide - DOC. 8123
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. Click on the CNXCOM-2 in slot #1 of the CNMSX-PRO
to display the ports of the card in the Detail System View area of the Configuration
Manager. To assign the forementioned settings, double click on the white field in
port A. The “Device Settings” dialog box opens. Confirm the parameters, shown
below.
“Device Settings” Dialog Box
Use the Programming Manager workspace in SIMPL Windows to select symbols
and assign their respective signals. For this example, a touchpanel and CNXCOM-2
symbols were added automatically when the devices were added to the system in the
Configuration Manager workspace. Expand the Network Modules folder and double
click on the touchpanel for a detail view (alternatively CTRL+D or drag and drop
into Detail View). Assign signals as shown after this paragraph.