1 rs-449 / dc-37 interface, H rs-449 pinouts for model mc1 – CANOGA PERKINS 2240 Fiber Optic Modem User Manual
Page 61
2240 Fiber Optic Modem
61
4.6.1.1 RS-449 / DC-37 Interface
This interface complies with EIA Standard RS-449. Electrical characteristics comply
with RS-422 for clock and data signals and RS-423 for control signals. The interface
uses the physical connector type and pinouts specified in RS-449 (refer to Table 4-H).
The RS-449 / 422 interface uses a 37-pin, female D-Type connector for the physical
connection.
Table 4-H.
RS-449 Pinouts
for Model MC1
Pin
RS-449
Direction
Number
Pin Name
A/B
(abbrev)
(full name)
1
SHLD
shield
-
4/22
SD
send data
to modem
5/23
ST
send timing
from modem
6/24
RD
receive data
from modem
7/25
RS
request to send
to modem
8/26
RT
receive timing
from modem
9/27
CS
clear to send
from modem
10
LL
local loopback
to modem
11/29
DM
data mode
from modem
12/30
TR
terminal ready
to modem
13/31
RR
receiver ready
from modem
14
RL
remote loopback
to modem
15
IC
incoming call
from modem
17/35
TT
terminal timing
to modem
18
TM
test mode
from modem
19
SG
signal ground
-
20
RC
receive common
-
37
SC
send common
to modem
2/36
N/A
extra clock for
to modem
receive data