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ROC364 Instruction Manual
4-17 Communications
Cards
Rev
Jun/05
Figure 4-14. Leased-Line Modem Wiring Schematic
The 9-pin COM1 and COM2 connectors can be used to connect the modem to a private line. This
connector is not FCC approved and cannot be used for leased-line operation. Present signals are:
Operating Mode
COMM Port
2-Wire 4-Wire
1 – Tip2
2 –
Ring2
6 Ring
Ring1
9 Tip Tip1
The following signals, used only for monitoring or connecting to an analyzer, are available at connector
P7 located at the bottom edge of the card. These signals are normally not active. To activate the signals,
SHUTDOWN (pin 8) must be grounded to pin 2 using a jumper. All unused signals can be left un-
terminated.
P7 Terminal
Function
1
+5 volts dc
2 COM
3 DCD
4 TXD
5 DTR
6 RTS
7 RXD
8
Shutdown