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F
. 4 - P
D
IG
IN
ESIGNATIONS
4-Wire RCV or 2-Wire XMT/RCV
44214-0898 <90-00005>
INSTALLATION
When it is necessary to wire directly to the 44214 4-Wire Mo-
dem, refer to Fig. 4 for the pin designation.
Reserved
56
Reserved
54
52
50
48
46
44
42
4-Wire XMT
40
38
36
34
RTS (TTL)
32
TD (TTL)
30
CD (TTL)
28
DSR (TTL)
26
24
22
RTS (RS-232)
20
18
CTS (RS-232)
16
RD (RS-232)
14
RX+ (RS-422)
12
CD+ (RS-422)
10
RTS- (RS-422)
8
TX- (RS-422)
6
TX- (RS-485)
4
RX+ (RS-485)
2
COMPONENT SIDE
OF PC BOARD
55
53
Reserved
51
Reserved
49
ALB (TTL)
47
DLB (TTL)
45
43
4-Wire RCV or 2-Wire XMT/RCV
41
4-Wire XMT
39
37
-21 to -56 VDC
35
33
DTR (TTL)
31
RD (TTL)
29
CTS (TTL)
27
Signal Ground
25
23
TD (RS-232)
21
DTR (RS-232)
19
Ground
17
CD (RS-232)
15
DSR (RS-232)
13
RX- (RS-422)
11
CD- (RS-422)
9
RTS+ (RS-422)
7
TX+ (RS-422)
5
TX+ (RS-485)
3
RX- (RS-485)
1
CIRCUIT SIDE
OF PC BOARD
P
9
AGE
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