Crestron cnmsx User Manual

Integrated Control System 

Crestron CNMSX

8. Select 

Diagnostics | Check Operating System Version (alternatively, 

depress the F5 key) from the Viewport. The Viewport may display a 
window as it scans various baud rates. Eventually, a message should 
appear in the Incoming section showing a version number. Such a 
response indicates that communications have been established. If a “No 
Communications with Rack” error message appears, proceed to 
"Troubleshooting Communications" on page 26. 

9.  If the baud rate of the CNMSX was something other than 38400, then 

the software automatically adjusts the baud rate to 38400.  

NOTE:  This section covers troubleshooting communications of the CNMSX via RS-
232 to the COMPUTER port. For troubleshooting Ethernet communications of the 
CNMSX with the optional CNX Ethernet expansion card, refer to the CNXENET or 
CNXENET+ Operations & Installation Guide (latest revision of Doc. 8129 or 8153, 
respectively) for further information. 

If communications with the CNMSX was not established, follow the steps in this 
section to help remedy the problem. After performing each step, repeat step 7 in 
"Obtaining Communications" on page 24 again.  

1.  Try repeating step 7 from "Obtaining Communications" on page 24 to 

attempt to establish communications.  

2.  Verify that the cable being used is correct. It should be a straight-

through cable. That is, pin 1 on one end is connected to pin 1 on the 
other end. Pin 2 connects to pin 2, etc. To work properly, pins 2, 3, and 
5 must be connected.  

3.  Verify that the proper COM port on the PC has been selected. Some 

computers have more than one COM port; some of which may be 
internal (e.g., for a modem). If verification can not be made, consult the 
user’s manual or contact the PC manufacturer.  

4. Check 

the 

ERR LED on the front of the CNMSX. If the LED is 

illuminated, unplug the unit and reapply power after a few seconds. If 
the LED illuminates again, call Crestron technical support. Refer to 
"Further Inquiries" on page 36. 

5.  If steps 1 through 4 have failed to result in communications, the last 

series of steps to perform is an overload/reset on the control processor. 
Complete the following steps to do so.  

5a.  While the Viewport is displayed, select Setup | Communications 

Settings (alternatively, depress Alt+D) to open the “Set Baud Rate” 
dialog box.  

•  Integrated Control System:  CNMSX