300 BPS DCM-2 Modem  (260-1173)     Installation       Faxback Doc. # 5979

SETTING UP THE MODEM II
Set your Modem's POWER Switch to OFF before connecting anything!

There are three steps to setting up your modem. Each step is fully explained
in this section.

* Connect your Modem II to your telephone.
* Connect your Modem II to a power supply.
* Connect your Modem II to a computer.

CONNECTING THE TELEPHONE TO THE MODEM II
The way you connect the Modem II to a telephone depends on how your tele-
phone is connected to the wall.

If you're using your Modem II outside the USA, you may need a Modular to
Modular Cable (279-374) and a Duplex Modular Jack (279-357).

If your telephone has this type of connection, attach your Modem II as 
shown, (If you plan on using the Modem in AUTOmatic Modes only, you don't 
need to use a telephone.)

If your telephone has the older style, four-prong connection, use an adapter
(279-360) to connect it to your Modem II.

If your telephone is wired directly to the wall, contact your telephone
company.

CONNECTING THE MODEM II TO MULTI-LINE TELEPHONES
You can use you Modem II with a multi-line telephone. However, you may need a
Multi-Line Adapter (43-270/271), a hardware modification to the Modem II, or
both.

If you use a Multi-Line Adapter only, the HOLD Button on an extension phone
can interfere with communication if someone presses it. To avoid this pro-
blem, have a qualified Radio Shack Service Technician modify the Modem II.

For other Adapters which may be used, contact your Radio Shack store.

CONNECTING THE POWER SUPPLY TO THE MODEM II
Insert the Ac adapter into the AC Power jack on the back of the modem. Plug
the adapter into an electrical wall outlet.

Use the supplied, UL-listed adapter only. the use of any other adapter could
damage the modem.

CONNECTING THE COMPUTER TO THE MODEM II
The Computer you connect to the Modem II must have RS-232C capabilities.

The following table summarizes the cable and connection requirements for
RS-232C equipped TRS-80's.

COMPUTER                          CABLE CATALOG NUMBER
Model I                           260-1145*
Model II/16                       260-4403
Model III/DT-1                    260-1408
Color Computer                    260-3014

* The Model I RS-232C cable is supplies with the RS-232C Interface Board
  (260-1145). See your Radio Shack Computer Center for details.

TO CONNECT THE MODEM II TO THE COMPUTER:
1. Be sure the Computer and Modem's power are OFF.
2. Plug the appropriate end of the connecting cable into the modem's RS-232
   jack.
3. Plug the other end of the cable into the Computer's RS-232C jack.
4. Power up the System as described in you Computer owner's manual.
* When you're not using the Modem, turn it OFF! If you don't, you won't be
  able to use your telephone normal conversation.
* When you use your Modem for the first time or when you seem to be getting
  garbled data, use the Modem's two test Modes--REMote and LOCal--to help 
  you find the cause of the problem.
* Be sure to always sign-off when communications are finished. The sign-off
  message depends on the computer that receives the phone call--BYE or GOOD-
  BYE are commonly used.
* Because of a pre-set feature of the Modem II, the phone will ring twice in
  Automatic Mode. To change the number of rings, a Radio Shack Technician 
  can modify the Modem II.

Note to Color Computer Users: Always set your Modem's FORCE DTR Switch ON.

(css 08/04/93)