Telebit WorldBlazer User Manual page 60

DTE
Modem
-
r - - -
Protective Ground
1
1
7
Signal Ground
7
2
Transmitted Data (TO)
...
2
~
3
-
Received Data (RD)
3
4
Request to Send (RTS)
....
4
5
...
Clear to Send (CTS)
5
20
Data Terminal Ready (DTR)
....
20
6
-
Data Set Ready (DSR)
6
8
...
Data Carrier Detected (DCD)
8
-
22
-
Ring Indicator (RI)
22
17
-
Receiver Signal Element Timing (RxC)
17
.....
15
-
DCE Transmitter Signal Element Timing (TxC)
15
24
DTE Transmitter Signal Element Timing (TxC)
. .
24
' - - - ' - - -
Figure 8-3. Synchronous RS-232 Cable Diagram
Receiver Signal Element Timing (RxC)
90257-01
The modem uses pin 17 (receiver signal element timing)
to provide the local DTE with received signal element
timing information. The transition from an on-to-off
condition indicates the center of each signal element on
the received data (RD) signal line.
Interface Description 8-9