6. DATA COMMUNICATION
6.3.8
DTE interface
Pin assignments
Pin
Mnemonic Circuit
number
1
CD
2
RXD
3
TXD
4
DTR
5
GND
6
DSR
7
RTS
8
CTS
9
RI
Signal source DTE means the signal goes from the PC to FELCOM 70.
Signal source DCE means the signal goes from FELCOM 70 to the PC.
6-68
CCITT
DIN
circuit
109
BB
D1
104
BA
D2
103
108
102
107
CA
S2
105
CB
M2
106
125
Signal
source
DCE
Carrier delect
DTE
Received Data
DCE
Transmitted Data
DTE
Data terminal ready
Signal ground
DCE
Data set ready
DTE
Request To Send
DCE
Clear To Send
DCE
Ring indicator
5 4 3 2 1
9 8 7 6
Description
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