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RS-232 ADAPTER
Switch SW1/SW2 configuration
34
Figure 8: RS-232 adapter top side
Switches SW1 (for Port 2) and SW2 (for Port 1) control the signal type of the RS-232 port.
Each switch contains five switch positions that can each be set to position A or B to select
the appropriate port option.
Table 4: RS-232 Card Switch SW1/SW2 Settings
Port Option
DTE (default) - see Figure 9
DCE - see Figure 10
+5 V (320 mA) isolated source
*Use DTE or DCE settings as appropriate
DCD output is not supported in DCE mode.
Each +5 V output is independently isolated and fused with a PTC (positive temperature
coefficient) resettable fuse at 320 mA at 65 °C.
CHAPTER 3: SETTING UP COMMUNICATION CARDS
SW1/SW2 Switch Position
1
A
—
B
GENERAL
D400 SUBSTATION GATEWAY USER'S MANUAL
2
3
4
A
A
A
B
B
B
*
*
*
5
A
B
*
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