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4.7.4
CABLE
CONNECTOR SPECIFICATIONS
{ CONT'D)
Table 4.5
RS232C Interface
Connecting Cable (B)
Table 4.3 Current Loop
(20 mA)
Interface Connection Cable
External
External
Equipment
NC
(DB-25P)
NC (MR-20F)
Equipment
Connections
Connections
Signal
Name
Pin
Pm
Signal
Name
Pm
No.
Pm
No.
Symbol
Symbol
Symbol
Symbol
No.
No.
Frame
0-0
FG
FG
1
1
grounding
Sending
data
?
Not
Used
2
SD
SD
4
Receiving
data
3
RD
RD
FACTT
/
ASR.
Auto-
selection
+6
V
5
Request
sending
On
4
RS
RS
Capable
of
sending
(3
Current
loop
(-)
o-o
CS
5
CS
TTY2
6
rO
6
o-o
Not used
Current
loop
(+)
DR
TTY
1
7
Signal
grounding
o o
SG
7
SG
0
V
8
GROUND
9
f 8
Not Used
ER
(OR
IQ ALARM)
o
J
20
(Note 2)
L25
Not used
Notes:
1.
The
type
of
connector
and pm
number
are
different
with
external
equipment.
2. When
the
current
loop interface
is
used,
short-circuit pm
No.
4
(signal
RS)
and
pm
No.
5
(signal
CS) of
plug
connector
DB-25P
for RS232C. Then
connect
the
plug
to
the
NC
receptacle DB-25S.
Table 4.4 RS232C Interface
Connecting Cable (A)
External
Equipment
NC (DB-25P)
Connections
Pin
Pin
Signal
Name
Symbol
Symbol
No
No
(H)
Frame
grounding
FG
1
FG
Sending
data
2
SD
SD
Receiving
data
3
RD
RD
Request
sending
o
4
RS
RS
Capable of
sending
5
CS
CS
33
6
Not
used
DR
Signal
grounding
o
7
SG
SG
8
IO BUSY
E
r
ER
(OR
Lo
25
Not used
10
ALARM)
When the external equipment does not
control the
CS
(Capable
of
Sending) signal
given
short-circuit
pins RS
and
CS on
both
Note
to
NC
,
ends of the cable
as
shown
in
Table
4.7.13.
-
32
—
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