Telebit WorldBlazer User Manual page 55

DTE
-
1
7
2
3
4
5
20
6
8
22
-
Modem
-
Protective Ground
1
Signal Ground
7
Transmitted Data (TO)
~-
2
....
-
Received Data (RD)
3
-
Request to Send (RTS)
...
4
~
-
Clear to Send (CTS)
5
Data Terminal Ready (DTR)
....
20 -
Data Set Ready (DSR)
6
Data Carrier Detected (DCD)
8
-
Ring Indicator (RI)
22
--
'-----
Figure 8-1. Asynchronous RS-232 Cable Diagram
the common reference signal ground for all of the other
pins. This line should be connected at both ends to
complete the signal circuits.
Transmitted Data (TD) and Received Data (RD)
8-4
These two signal lines transfer data between the DTE
(computer or terminal) and the DCE (modem). All signal
names are as viewed from the DTE. Therefore, the DTE
transmits data on the transmitted data (TD) line (pin 2)
and receives data on the received data line (pin 3).
However, the DCE receives data from the DTE on the
transmitted data line (pin 2) and sends data to the DTE on
the received data line (pin 3).
Interface Description
90257-01