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RS-232 Cabling
F
F-5
Rx
Tx
DTR
GND
DSR
RTS
CTS
1
2
3
4
5
6
7
8
9
RS-232C
HYDRA
DB-9
Tx
Rx
RTS
CTS
DSR
GND
DCD
DTR
RI
MODEM
DB-25
RS41 CABLE
(OR EQUAL)
FEMALE
MALE
PINS
KEY
Tx – TRANSMIT
Rx – RECEIVE
RTS – REQUEST TO SEND
CTS – CLEAR TO SEND
DSR – DATA SET READY
GND – GROUND
DCD – DATA CARRIER DETECT
DTR – DATA TERMINAL READY
RI – RING INDICATOR
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
oo07f.eps
Figure F-4. Hydra (DB-9) to Modem (DB-25) RS-232 Connection