Lantronix MSS1-T, Reference Manual

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DIP Switches Pinouts
C - 2
C.3.2 Screw Terminal Block
The figure below shows the pin connections of the MSS485 (RS-485) screw terminal block.
Figure C-4: Pinout of Screw Terminal Block
C.4 DIP Switches
There are eight DIP switches located on the bottom of the MSS485, labeled left to right. For more
information about their configuration, see Installation on page 2-5.
C.5 Modem Wiring
NOTE: Modem wiring does not apply to the MSS485.
C.5.1 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 MSS’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 MSS’s DSR pin. Wiring
the modem as described may permit the use of pre-assembled connectors.
C.5.2 DTR (Data Terminal Ready)
The MSS normally asserts DTR. When modem control is enabled, 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 ser-
vice. 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.
Shield
TXA
TXB
RXB
RXA
Shield