Furuno FELCOM 50 Installation Manual page 37

RS-232 connector pin assignments
Pin Mne-
Circuit DIN
number monic
1 CD
2 RXD BB
3 TXD BA
4 DTR
5 GND
6 DSR
7 RTS CA
8 CTS CB
9 RI
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.
CCITT Signal
Dscription
circuit source
109 DCE Carrier detect
D1 104 DTE Received Data
D2 103 DCE Tramsmitted Data
108 DTE Data terminal ready
102 Signal ground
107 DCE Data set ready
S2 105 DTE Request To Send
M2 106 DCE Clear To Send
125 DCE Ring indicator
5 4 3 2 1
9 8 7 6
30
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.