30
RS-232 connector pin assignments
Pin
Mne-
Circuit DIN
CCITT Signal
Dscription
number monic
circuit source
1
CD
109
DCE
Carrier detect
2
RXD
BB
D1
104
DTE
Received Data
3
TXD
BA
D2
103
DCE
Tramsmitted Data
4
DTR
108
DTE
Data terminal ready
5
GND
102
Signal ground
6
DSR
107
DCE
Data set ready
7
RTS
CA
S2
105
DTE
Request To Send
8
CTS
CB
M2
106
DCE
Clear To Send
9
RI
125
DCE
Ring indicator
5 4 3 2 1
9 8 7 6
Signal source DTE means
that the signal goes from the
PC to FELCOM.
Signal source DCE means
that the signal goes from
FELCOM to the PC.
Signal descriptions
102 Signal Ground
Digital ground, return line.
103 Send Data
Data transmitted from DTE (PC) to DCE (FELCOM).
104 Receive data
Data Received from DCE (FELCOM) to DTE (PC).
105 Request To Send
OFF requests DCE (FELCOM) to suspend transmission to DTE (PC).
ON requests DCE (FELCOM) to resume transmission to DTE (PC).
106 Clear to send
OFF indicates that DCE (FELCOM) cannot accept data from DTE (PC).
ON indicates that DCE (FELCOM) is prepared to accept data from DTE (PC).
107 Data Set Ready
Signal from FELCOM that when ON indicates that a data call setup is in progress.
108 Data Terminal Ready
Signal from PC. This signal is used in the Hotline mode and indicate when going from OFF to ON that
the PC wants to make a data call. The PC clears the call by setting the signal from ON to OFF.
109 Receive Signal Indicator
Signal from FELCOM that when ON indicates that connection is established and received data will be
delivered on circuit 104, Received Data.
125 Ring Indicator
Signal from FELCOM. This signal is used in the Auto answer OFF mode and when ON indicates that
an incoming call is in progress. The signal will go OFF when the call is answered by the PC by turning
circuit 108 Data Terminal Ready ON.
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Содержание Felcom 30
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