A rs-232d pinouts – CANOGA PERKINS 2240 Fiber Optic Modem User Manual
Page 43
2240 Fiber Optic Modem
43
Data Set Ready (DSR) and Test Mode (TM) are local status leads and follow the functions
described in RS-232D. DSR typically indicates that the modem is ready to handle transmit
data. During loopbacks, the behavior of this signal is dependent on the position of the DSR
jumper (see description of DSR jumper). TM indicates that a loopback is active on one or
both modems.
Local Loopback (LL) and Remote Loopback (RL) are loopback control leads and perform
the same functions as the 2240 front panel LOOP switch LOC and REM positions. LL and
RL are interface signal inputs which can be used to activate the LOC or REM loop functions.
Table 4-A.
RS-232D
Pinouts
Pin
RS-232D
Direction
Number
Pin Name
(abbrev)
Full Name
1
PG
Protective Ground
-
2
TD
Transmit Data
to modem
3
RD
Receive Data
from modem
4
RTS
Request to Send
to modem
5
CTS
Clear to Send
from modem
6
DSR
DCE Ready
from modem
7
SG
Signal Ground
-
8
DCD
Receive Line Sig. Det.
from modem
12
SDCD
Secondary Line Sig. Det.
from modem
13
SCTS
Secondary CTS
from modem
14
STD
Secondary TD
to modem
15
SCT
Transmit Clock
from modem
16
SRD
Secondary RD
from modem
17
SCR
Receive Clock
from modem
18
LL
Local Loopback
to modem
19
SRTS
Secondary RTS
to modem
20
DTR
DTE Ready
to modem
21
RL
Remote Loopback
to modem
22
RI
Ring Indicator
from modem
23
DSRS
Data Signal Rate Selector
to modem
24
SCTE
Transmit Clock External
to modem
25
TM
Test Mode
from modem