Serial Communications Page 7-3_________________________________________________________________Configuring the ModemBefore connecting the Model 2010D to a modem, the modem must beconfigured to answer the phone and act as a "dumb" modem. Ifthe modem has DIP switches, this can usually be done by settingthe switches appropriately. Many of the newer modems, however,have no switches, but must be set up via software. This can beaccomplished by attaching the modem to a PC or terminal andentering the instruction codes as described below. Once thesettings have been entered, they must be saved to the modem'snon-volatile memory. Following is a brief description of thecommands that should be entered in order to configure a Hayescompatible modem for proper auto-answer operation with the Model2010D.AT&C1 Enable Carrier Detect: The carrier detect line is used toinform the Model 2010D when a carrier tone is detected.AT&S1 Enable DSR Control: When DSR is enabled, the DSR linewill be controlled by the modem. DSR will be low whenthe modem is in command mode and high when the modem ison-line. When this line is dropped, the Model 2010Dautomatically terminates the remote session. When itis brought high, the Model 2010D presents a log-inmessage.AT&D3 Disconnect when DTR Drops: When a remote communicationssession is terminated or times out, the Model 2010Dwill drop the DTR line. This modem command instructsthe modem to disconnect and reset itself when DTR isdropped.ATA Auto-Answer: This command causes the modem to go off-hookand answer when the phone rings.ATE0 Disable Command Echo: This prevents command characters frombeing echoed.ATQ1 Disable Result Codes: This prevents command result codes (e.g."OK" when a command is accepted) from being sentto the Model 2010D.AT&W0 Save Configuration: Saves the settings to non-volatilememory. NOTE: Though most modems support thiscommand, not all modems contain non-volatile memory.If the modem does not have non-volatile memory, allsettings will revert to factory defaults when themodem is reset or power fails.
