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RS-232
Connections
73
RS-232 DTE Loopback Connections
Figure 66. Loopback Connections for RS-232
For Transmit and Receive loopback, connect only those lines.
When Flow Control setting on the
XTRALINK IP
is set for RTS/CTS,
those lines must be looped. Usually DTR and DSR must also be
looped. The Flow Control setting for the program must match the
Server settings. The CD connection is needed by some terminal
programs to simulate Carrier.
RS-422
Connections
74
A
A
P
P
P
P
E
E
N
N
D
D
I
I
X
X
B
B
:
:
R
R
S
S
-
-
4
4
2
2
2
2
C
C
O
O
N
N
N
N
E
E
C
C
T
T
I
I
O
O
N
N
S
S
XTRALINK IP DB-9 Pin-outs in RS-422 Mode
RS-422
Signal Name
Direction
RS-422
DB9M
Pin
Receive Data A (
−
) In
RXDA
(
−
) 1
Receive Data B (+)
In
RXDB (+)
2
Transmit Data B (+)
Out
TXDB (+)
3
Transmit Data A (
−
) Out
TXDA
(
−
) 4
Signal Ground
--- GND
5
Clear to Send A (
−
) In
CTSA
(
−
) 6
Clear to Send B (+)
In
CTSB (+)
7
Request to Send B (+)
Out
RTSB (+)
8
Request to Send A (
−
) Out
RTSA
(
−
) 9
Figure 67. RS-422 Connections in a DB-9 Connector