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CIRCUIT DESCRIPTION
F
. 1 - F
S
IG
UNCTIONAL
CHEMATIC
DTR
31
RTS
32
TD
30
RD
29
TTL /
CMOS
CD
28
CTS
27
DSR
26
SIGNAL
25
GROUND
TD
21
RTS
20
DTR
19
RS-232
16
CTS
CD
15
RD
14
13
DSR
5
TX+
TX-
6
RTS+
7
RTS-
8
RS-422
RX+
12
RX-
11
CD+
10
CD-
9
3
TX+
TX-
4
RS-485
2
RX+
RX-
1
-21 TO -56 VDC
35
17
GROUND
P
4
AGE
; 44214 4-W
M
IRE
ODEM
JP4
JP5
I/O
GATING
&
DRIVERS
I/O
GATING
&
DRIVERS
T O
JP1
T O
I/O
JP2
GATING
&
DRIVERS
I/O
T O
GATING
JP3
&
DRIVERS
+5 VDC
SOURCE
REGULATED
POWER
SUPPLY
-12 VDC SOURCE
+12 VDC SOURCE
DTR
NOTE: The following are accessible
RTS
through the front panel:
S1, S3, S4, S5, R44, R53
+5VDC
MODE
S4
ALB
47
S3
MICRO
CONTROLLER
ALB
S5
DLB
DLB 45
DATA
RATE
S2
INTERFACE
ENABLE
+5
VDC
S6
MODEM
CONTROLLER
I/O
GATING
&
DRIVERS
2W/4W
R44
ANALOG
R53
CIRCUIT
S1
RESET
DTR
RTS
CD
CTS
RD
TD
S7
RING
39
4W XMT
TIP
40
4W XMT RCV
42
RING
41
TIP
2W LINE
44214-0898 <90-00005>
-or-
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