RS
232
The
RS
‐
232
standard
uses
single
ended
signals
on
a
DB
‐
25
connector.
The
adapter
DB
‐
25
connector
follows
this
standard
when
the
port
jumpers
are
installed
for
RS
‐
232.
Use
any
straight
through
25
conductor
DB
‐
25M
to
DB
‐
25F
cable
(such
as
MicroGate
Part
#
CMF000)
to
connect
the
adapter
connector
to
the
communications
equipment.
The
maximum
data
rate
supported
by
the
adapter
when
using
RS
‐
232
is
128Kbps.
Cable
length
and
signal
loading
may
reduce
the
maximum
usable
data
rate
from
this
value.
RS
‐
232
DB
‐
25
Male
DTE
Signal
Name
Electrical
Desc
Pin
#
Direction
Earth/Shield
Ground
1
TxD,
Transmit
Data
RS
‐
232/V.28
2
Output
RxD,
Receive
Data
RS
‐
232/V.28
3
Input
RTS,
Request
to
Send
RS
‐
232/V.28
4
Output
CTS,
Clear
to
Send
RS
‐
232/V.28
5
Input
DSR,
Data
Set
Ready
RS
‐
232/V.28
6
Input
Signal
Ground
7
DCD,
Data
Carrier
Detect
RS
‐
232/V.28
8
Input
TxC,
Transmit
Clock
RS
‐
232/V.28
15
Input
RxC,
Receive
Clock
RS
‐
232/V.28
17
Input
LL,
Local
Loopback
Control
RS
‐
232/V.28
18
Output
DTR,
Data
Terminal
Ready
RS
‐
232/V.28
20
Output
RL,
Remote
Loopback
Control
RS
‐
232/V.28
21
Output
RI,
Ring
Indicator
RS
‐
232/V.28
22
Input
AuxClk,
DTE
Clock
Output
RS
‐
232/V.28
24
Output
Figure
5 RS
‐
232
Cable
(Part#
CMF000)