Operator`s manual

4 Communication
52
4.7 Installing and Using the External Modem (Continued)
Step 2: Connect and Configure the Modem
Use a shielded, null-modem serial cable, DB–25 male to DB–9 male, to connect the modem
to the CFR.
1
The most common ways to connect the cable are:
• A null-modem cable with DB–25 male to DB–-9 male ends (Figure 4.20).
• A null-modem cable with DB–25 male to DB–25 male ends and a 9–25 adapter.
• A standard straight-through cable with DB–9 male to DB–25 female and a null-
modem adapter.
2
Set the modem’s DIP switches as shown in Figure 4.21.
TIP: Do not enable auto answer with the DIP switches.
Figure 4.21
Modem DIP Switch Settings
sgnitteShctiwSPIDmedoMsgnitteShctiwSPIDmedoM
sgnitteShctiwSPIDmedoM
sgnitteShctiwSPIDmedoMsgnitteShctiwSPIDmedoM
hctiwShctiwS
hctiwS
hctiwShctiwS noitpOnoitpO
noitpO
noitpOnoitpO hctiwShctiwS
hctiwS
hctiwShctiwS noitpOnoitpO
noitpO
noitpOnoitpO
11
1
11
.)edirrevORTD(RTDerongiotmedomteS
55
5
55
.rewsnaotuaelbasiD
22
2
22
.stluser)ciremunton(labrevetarenegotmedomteS
66
6
66
.stcennoctinehwDCotmedomteS
33
3
33
.sedoctluseretarenegotmedomteS
77
7
77
.purewopnognittesyrotcafdaolotmedomteS
44
4
44
.)desserppusohcE(sdnammocfogniohceelbasiD
88
8
88
.)edomtrams(sdnammocTAezingocerotmedomteS
Figure 4.20
External Modem Cable Wiring
11
TXD 2
RXD 3
4
GND 5
6
7
8
9
1
2 TXD
3 RXD
4
5
6
7 GND
24
UNIT RS-232
SERIAL CONNECTOR
(9 PIN FEMALE)
MODEM
25 PIN IBM PC
SERIAL PORT
25