Lantronix MSS4-D, Installation Manual

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Configuration Serial Port Configuration
4- 9
4.3.3 Termination
RS-485 connections must be terminated properly in order to work. Termination is
necessary when using long cable runs, although
only end nodes should be terminated. The
termination option is disabled by default.
Figure 4-14: Enabling RS-485 Termination
4.3.4 RS-422 Networking
The MSS is compatible with RS-422 networks in four-wire RS-485 mode. Connect the
MSS to a single slave device using a swapped cable, as shown below, and configure the
MSS as if you were going to use it for four-wire RS-485 networking.
Figure 4-15: RS-422 Connection
4.4 Serial Port Configuration
The serial ports are set at the factory for 9600 baud, 8 data bits, one stop bit, and no parity.
Remember that ports should be logged out after configuration so the changes will go into
effect.
On the MSS4, the first serial port is designated as the console port. However, this is not a
dedicated console port and is fully configurable.
4.4.1 Access Mode
The serial port access mode governs what kind of connections each port can accept. Local
access permits local logins on the serial port. Remote access allows network hosts to
connect to the MSS. Dynamic access (the default) allows both local and remote access.
Local>> CHANGE RS485 PORT 3 TERMINATION ENABLED
TX
RX
RX
TX
TX-
TX+
RX+
RX-
Shield
Shield
RX-
RX+
TX+
TX-
Shield
Shield
Master
(MSS) Slave