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11-18 DCP Mode 2 Installation and Administration
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RS-232 Breakout Box
If you are using a terminal that requires DSR to be active (for example, a 513 BCT or TELETYPE 5420),
you must install an RS-232 breakout box if you want to resend an initialization string or receive a response
as to whether or not an initialization was successful (this is because the first initialization string you send
turns DSR off).
To install the RS-232 breakout box:
1. Insert the breakout box in the RS-232 connection between the terminal and the modem.
2. Using the switches on the breakout box, open Pin 6 (DSR).
3. Jumper Pin 6 on the terminal side to +v on the breakout box. This will provide DSR active to the
terminal.
4. At the terminal, type AT and press RETURN . The modem should echo back ‘‘0’’ to the terminal.
5. At the terminal, type AT&F and press RETURN . This will return the modem to the factory
settings and DSR will be active again. The modem should echo back ‘‘OK’’.
6. Re-enter the initialization string.
7. Remove the breakout box and reconnect the modem to the modem pool.
Stand-Alone Modem Cabling
To install cabling, do the following:
1. Connect an M25B RS-232 (male to male) cable between the modem and the 7400A.
2. Connect the modular cord that comes with the modem to the back of the modem and to one side of a
104A connecting block.
3. Connect the D8W-87 cord that comes with the data set between the data set and the other side of the
104A connecting block.
4. Wire the connecting block to the ports on the switch. Wire the modem to the analog port and wire
the 7400A to the digital port.