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Crestron QM-RMCRX  
         QuickMedia™ Receiver/Processor
 
 
COM B
COM A
 
 
 
COM (A  & B) 
These two DB9 (male) software programmable, bi-directional serial ports are 
available for RS-232 communication, with hardware and software handshaking 
and modem control. Speeds are rated up to 115,200 bps. COM B can also be 
used as the console port. (Null modem cable is required to connect to a 
computer.) 
NOTE: RS-422 and RS-485 are not supported. 
 
Standard COM DB9 Pinout 
PIN DIRECTION  DESCRIPTION 
TO QM-RMCRX 
(DCD) Data Carrier Detect 
To QM-RMCRX 
(RXD) Receive Data 
From QM-RMCRX 
(TXD) Transmit Data 
From QM-RMCRX 
(DTR) Data Terminal Ready 
Common 
(SG) Signal Ground 
From QM-RMCRX 
(DSR) Data Set Ready 
From QM-RMCRX 
(RTS) Request To Send 
To QM-RMCRX 
(CTS) Clear To Send 
To QM-RMCRX 
(RI) Ring Indicator 
 
Indicators 
The QM-RMCRX front panel indicators are described as follows.  
COM A 
This red LED indicates COM A port activity. 
COM B 
This red LED indicates COM B port activity. Constant blinking indicates that 
the port is used for remote console connection. 
IR 
This red LED indicates IR port activity. 
INPUT 
This red LED indicates input activity. 
PWR (Power) 
This green LED illuminates when the unit is connected to and receives 24 VDC 
power from an external power pack or from Cresnet.  
ACT (LAN)  
This yellow LED illuminates when the QM-RMCRX communicates with any 
device on the network.   
Operations Guide – DOC. 6236A 
  QuickMedia™ Receiver/Processor: QM-RMCRX 
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