The DB37 Pinout (RS-449) refers to a 37-pin D-sub connector used in the RS-449 serial communication standard. RS-449 is a legacy interface standard developed by the Electronic Industries Association (EIA) that defines electrical and mechanical characteristics for serial data communication, often used with RS-422 and RS-423 signaling.
37
send common
19
signal ground
36
standby / indicator
18
test mode
35
terminal timing B
17
terminal timing A
34
new signal
16
select frequency
33
singal quality
15
incomming call
32
select standby
14
remote loopback
31
receiver ready B
13
receiver ready A
30
terminal ready B
12
terminal ready A
29
data mode B
11
data mode A
28
terminal in service
10
local loopback
27
clear to send B
09
clear to send A
26
receive timing B
08
receive timing A
25
request to send B
07
request to send A
24
receive data B
06
receive data A
23
send timing B
05
receive timing A
22
send data B
04
send data A
21
no connection
03
no connection
20
receive common
02
signal rate indicator
01
signal ground
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