Lantronix MSS4 User's Guide download pdf (Page 75)

MSS User Guide 7: Pinouts

7-4

Modem Wiring

DSR (Data Signal Ready) versus CD (Carrier Detect)

By default, most modems assert CD only during a valid connection. In this case the

modem’s CD pin may be wired to the Server’s DSR pin. Alternately, many modems can

be configured such that DSR acts like CD. In this case, the modem’s DSR pin may be

wired to the Server’s DSR pin.

DTR (Data Terminal Ready)

The MSS normally asserts DTR. When modem control is enabled on the MSS, the server

will de-assert DTR for three seconds each time the port is logged out and each time a

user disconnects from a modem service. The modem must be configured to hang up and

recycle when DTR is de-asserted. If the modem is not configured in this way, sessions

may not be properly disconnected.

In this case, the modem’s DSR pin may be wired to the Server’s DSR pin.

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Lantronix MSS4 User's Guide Page 75