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5.2 Wiring
5.2.1 Wiring between HSD modem and router
A serial straight cable with a 25 pin connector (RS-232 interface) or 37 pin connector (RS-
449 interface) connects between the IB-681 and HSD terminal (ex. Router) as shown
below. The interface to use is selected with DIP switch SW2. For the RS-232 interface, the
length of the cable must not exceed 15 meters. If a longer cable is required use the RS-
449 interface instead. Only one HSD Terminal (Router) can be connected.
To comm. unit
Figure 13 Connection of HSD modem and HSD terminal
RS-232 interface description
Pin (male) arrangement
Note: The HSD modem uses synchronous serial communication, therefore the HSD ter-
minal (PC, etc.) cannot be directly connected unless it has a synchronous serial port.
RS-449 interface description
(RS-232)
HSD DATA 1
HSD
MODEM
IB-680
HSD DATA 2
(RS-449)
R
S
2 -
3
2
P
n i
N
. o
S
g i
n
l a
2
T
D
3
R
D
4
R
T
S
5
C
T
S
6
D
S
R
7
S
G
8
D
C
D
1
5
T
C
1
7
R
C
2
0
D
T
R
2
2
I R
Pin nos. 1, 9-14, 16, 18-19, 21, 23-25 are not used.
Figure 14 RS-232 Interface
20
TERMINAL
Serial straight cable
RS-232 interface: 25 pin connector
RS-449 interface: 37 pin connector
C
C
T I
T
S
g i
n
l a
D
e
i C
c r
u
t i
1
0
3
T
a r
n
s
m
t i
1
0
4
R
e
c
e
v i
1
0
5
R
e
q
u
e
t s
1
0
6
C
e l
r a
o t
1
0
7
D
a
a t
S
t e
1
0
2
S
g i
n
l a
1
0
9
R
e
c
e
v i
e
S
g i
1
1
4
T
a r
n
s
m
1
1
5
R
e
c
e
v i
1
0
8
D
a
a t
T
r e
m
1
2
5
R
n i
g
n I
HSD
ex.
Router
s
c
i r
t p
o i
n
D
C
- E
D
e t
d
D
a
a t
e
d
D
a
a t
o t
S
e
n
d
S
e
n
d
R
e
a
d
y
G
o r
u
n
d
–
n
l a
n I
d
c i
t a
r o
t i
C
o l
k c
e
C
o l
k c
n i
l a
R
e
a
d
y
d
c i
t a
r o
T
E
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