Data interfaces, Eia-449 specifications, Eia-449 37-pin d connector pinouts – Comtech EF Data SNM-1010L User Manual
Page 42
SNM-1010L Data/Control Modem
Revision 0
Installation
MN/SNM1010L.OM
2.3.4 Data
Interfaces
2.3.4.1 EIA-449
Specifications
Table 2-5. EIA-449 Specifications
Parameter
Specification
Circuit Supported
SD, ST, TT, RD, RT, DM, RR, RS, CS, MC
Amplitude (RD, RT, ST, DM, RR)
± 2V differential into 100
Ω
Impedance (RD, RT, ST, DM, RR)
Less than 100
Ω, differential
Impedance (SD, TT, MC)
4k
Ω
True when B positive with respect to A
False when A positive with respect to B
Phasing (RD, RT)
False-to-true transition of RT nominally in center of RD data bit
Symmetry (ST, TT, RT)
50% ± 5%
2.3.4.2 EIA-449
37-Pin
D Connector Pinouts
The EIA-449 interface (Table 2-6) is provided on a 37-pin D female connector (DCE).
Refer to the following listing for parameters.
Connector Type
37-pin D subminiature, female
Signal Type
EIA-449
Table 2-6. EIA-449 37-Pin Connector Pinouts
Signal Function
Name
EIA-449
Pin #
V.35
Pin #
EIA-530
Pin #
I/O
Send Data -
SD-A
4
P
2
I
Send Data +
SD-B
22
S
14
I
Send Timing -
ST-A
5
Y
15
O
Send Timing +
ST-B
23
AA
12
O
Receive Data -
RD-A
6
R
3
O
Receive Data +
RD-B
24
T
16
O
Request to Send -
RS-A
7
C
4
I
Request to Send +
RS-B
25
19
I
Receiver Timing -
RT-A
8
V
17
O
Receiver Timing +
RT-B
26
X
9
O
Clear to Send -
CS-A
9
D
5
O
Clear to Send +
CS-B
27
13
O
Data Mode -
DM-A
11
E
6
O
Data Mode +
DM-B
29
22
O
Receiver Ready -
RR-A
13
F
8
O
Receiver Ready +
RR-B
31
10
O
Terminal Timing -
TT-A
17
U
24
I
Terminal Timing +
TT-B
35
W
11
I
Master Clock - (Input)
MC-A
16
CC
20
I
2–8