Lantronix MSS4-D Installation Manual

Also see for MSS4-D: Installation guide

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Lantronix MSS4-D Installation Manual Manual pdf 43 page image

Configuration Serial Port Configuration4-134.4.6 Flow ControlNote: RTS/CTS Flow Control is not available in RS-485 mode.Both RTS/CTS (hardware) and XON/XOFF (software) flow control methods can be usedon the MSS. RTS/CTS controls data flow by sending serial port signals between twoconnected devices. XON/XOFF controls data flow by sending particular charactersthrough the data stream: Ctrl-Q to accept data (XON) and Ctrl-S when data cannot beaccepted (XOFF).Note: Applications that use Ctrl-Q and Ctrl-S will conflict with XON/XOFFflow control, in which case RTS/CTS is recommended.To switch between flow control methods for a serial port, use the Change Flow Controlcommand followed by the preferred method. If you do not wish to use flow control at all,specify None.Figure 4-25: Enabling Recommended Flow ControlIf you’re using XON/XOFF flow control, the XON/XOFF characters will be removed fromthe data stream by default. To prevent this removal, enable Passflow with the ChangePassflow option. However, passflow is unnecessary in most situations.4.4.7 Modems and Modem SignalingNote: These modem-related commands can not be used with RS-485networking.The following sections explain some of the MSS options that are typically considered to bemodem-related. They do not apply exclusively to modems, but to communications devicesin general. Most options are mutually exclusive when enabled.Note: Modem Emulation Mode, in which the MSS acts like a modem and onlyaccepts AT modem commands, is discussed in Chapter 5.After configuring modem-related settings, refer to the Modem Configuration Checklist onpage B-4.4.4.7.1 Modem ControlWhen enabled, this feature allows the MSS to check for signals coming from the modem(or other attached serial device) to establish whether a valid connection exists. If aconnection has ended, the MSS should be able to log out the port and prepare to accept anew connection. Similarly, if no connection is open, the MSS should know to ignorespurious characters from the port and only accept valid connection attempts. The MSS cando both of these when modem control is enabled.Local>> CHANGE PORT 2 FLOW CONTROL CTSRTSorLocal>> CHANGE PORT 2 FLOW CONTROL XONXOFF