11
4.2 Pin Connections
Figures 4-1
and
4-2
show the pin connections for the V.35
↔
RS-422 Interface Converter. The pins that are
grayed out in these figures indicate signals tied to the front-panel LEDs only.
The Converter is shipped with the RS-422 port configured as DCE and the V.35 port configured as DTE.1 In
this configuration, pins 12 and 30 are inputs. See
Figure 4-3
for jumper W2 settings.
To operate the Converter with the RS-422 port configured as DTE and the V.35 port configured as DCE, the
signal directions are reversed2. Pins 12 and 30 of the RS-422 port become outputs. See
Figure 4-4
for jumper
W1 settings.
Figure 4-3. Signal directions for RS-422 port configured as DCE; V.35 port configured as DTE.
1NOTE
In this configuration, W1 has no effect on the circuit. W2 is used instead.
Figure 4-4. Signal directions for V.35 port configured as DCE; RS-422 port configured as DTE.
2NOTE
In this configuration, W2 has no effect on the circuit. W1 is used instead.
Pin 30
Pin 12
W 1
C
B
A
+
V
Pin H
Pin 30
Pin 12
W 2
A
B
C
+
V
Pin H
DS 9
DM
DTR
AB–DTR passed through.
BC–DTR always asserted.
AB–DTR always asserted.
BC–DTR passed through.