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Standard RS-232 Wiring Procedure

 

Standard RS-232 wiring
 
Pin No. Description Function
1 Data Carrier Detect (DCD) DTE input, data link established, also known as Receive Line Signal Detect (RLSD)
2 Received Data (RD) DTE input data
3 Transmitted Data (TD) DTE output data
4 Data Terminal Ready (DTR) DTE output, device ready
5 Ground provides a Zero reference voltage
6 Data Set Ready (DSR) DTE input, DCE is ready to communicate
7 Request to Send (RTS) DTE output, DTE would like to transmit
8 Clear to Send (CTS) DTE input, DCE is ready to transmit
9 Ringing Indicator (RI) DTE input, announces incoming call
What is DTE and DCE ?

Data Terminal Equipment (DTE) is typically either a dumb terminal or the serial port on a computer/workstation.
Data Communications Equipment (DCE) is typically a modem, DSU/CSU, or other piece of data communications equipment.

How connections are established between a DTE and DCE ?

The pin specifications of RS232 are written from the perspective of DTE end of link. so, the output from DTE becomes a input to DCE. Thus, Transmitted Data (TD) is a output signal for DTE, but it becomes a input signal for a DCE.
To connect a DTE and DCE, we just need a straight (pin-to-pin) cable. If we want to connect two DTE with each other then, a cross-over cable is required. this just makes each DTE feel that it is connected to a DCE at other end.

 

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