Installation Control Unit IV Reference Manual
2-10 529-0004 Ver.3
2.7.1 Connecting the Control Unit to the host computer or modem
To connect COM 1 or COM 2 to the host computer or modem, or to an Ethernet–RS-232
bridge, you will need the following equipment:
Direct link
• standard RS-232 cable with DB-25 connectors no longer than 15 meters (50 feet)
Modem
• RS-232 null modem cable with DB-25 connectors no longer than 15 meters (50 feet)
• telephone extension cord with RJ-11 connectors
• modem
LAN connection
• Ethernet–RS-232 bridge
• standard RS-232 cable with DB-25 connectors no longer than 15 meters (50 feet)
• category 5 cabling with RJ-45 connectors
If you want to connect the Control Unit to a host computer using an RS-232 connection:
1. Connect one end of the RS-232 cable with DB-25 connectors (standard cable for direct
link, or null modem cable for modem link) to one of the connectors labeled COM 1 or
COM 2.
2. Connect the opposite end of the cable to the serial port on the host computer or modem.
3. If you have connected the Control Unit to a modem, plug one end of the telephone
extension cord into the line jack on the modem and the other end into the wall telephone
jack.
If you want to connect the Control Unit to a host computer using a LAN connection:
2. Connect a standard RS-232 cable with at least one DB-25 connector to either COM 1 or
COM 2 on the Control Unit. Connect the other end to a port on an Ethernet–RS-232
bridge.
3. Plug one end of a category 5 cable to the Ethernet–RS-232 bridge and connect the other
end to the Ethernet network.
The Control Unit is now ready to receive subscriber information from the host computer
directly, by modem, or via a LAN connection (Ethernet bridge).
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