B rs-449 pinouts – CANOGA PERKINS 2240 Fiber Optic Modem User Manual
Page 46
46
Canoga Perkins
Table 4-B.
RS-449 Pinouts
* The extra clock is an enhancement added to -422 interfaces. Any -422
interface card outfitted with this capability can be identified via the lack
of the W16 / W15 BAL_CTRL jumper. The W16 / W15 jumper was
never described in the manual, so do not try to find a reference to it in the
manual.
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
- (tied to SG)
33
SQ
signal quality
from modem
34
NS
new signal
to modem
37
SC
send common
to modem
2/36*
N/A
extra clock for
to modem
receive data