Lantronix EMG 8500 EMG User Guide - Page 197

10: Device Ports Parity Flow Control Enable Logins Max Direct Connects Show Lines on Connecting USB Channel Parity checking is a rudimentary method of detecting simple, single-bit errors. From the drop-down list, select the parity. The default is none. A method of preventing buffer overflow and loss of data. The available methods include none, xon/xoff (software), and rts/cts (hardware). The default is none. For serial devices connected to the device port, displays a login prompt and authenticates users. Successfully authenticated users are logged into the command line interface. The default is disabled. This is the correct setting if the device port is the endpoint for a network connection. Enter the maximum number (1-15) of simultaneous connections for the device port. The default is 3. If enabled, when the user either does a connect direct from the CLI or connects directly to the port using Telnet or SSH, the EMG outputs up to 24 lines of buffered data as soon as the serial port is connected. For example, an EMG user issues a connect direct device 1 command to connect port 1 to a Linux server. For example, if the user issues the ls command to display a directory on a Linux server, then exits the connection, the results of the ls will be stored in the buffer. When the user then issues another direct connect device 1, the last 24 lines of the ls command is displayed so the user can see what state the server was left in. Applies to USB device ports only. When a dual channel USB device is connected to the device port, this allows the user to select which of the channels is the active channel used for all connections. Only one channel can be active at any time. Enter the number 1 or 2. The default is 1. Hardware Signal Triggers Note: When the DSR signal drops on a device port, indicating that the attached cable has been disconnected or the attached device has been powered off, the EMG will log the event in the Device Ports system log and send a slcEventDevicePortAction SNMP trap. The log message and SNMP trap only occur if there is an active (connect direct or network connection) to the device port. Check DSR on Connect Disconnect on DSR Assert DTR If this setting is enabled, the device port only establishes a connection if DSR (Data Set Ready) is in an asserted state. DSR should already be in an asserted state, not transitioning to, when a connection attempt is made. Disabled by default unless dial-in, dial-out, or dial-back is enabled for the device port. Note: Applies to serial RJ45 device ports only. If a connection to a device port is currently in session, and the DSR signal transitions to a de-asserted state, the connection disconnects immediately. Disabled is the default unless dial-in, dial-out, or dial-back is enabled for the device port. Note: Applies to serial RJ45 device ports only. By default, DTR (Data Terminal Ready) is asserted on a device port nearly all of the time (except momentarily when a port is opened for operations). Unchecking this option will deassert DTR, simulating a cable disconnection for the device that is connected to a device port. Note: Applies to serial RJ45 device ports only. EMG™ Edge Management Gateway User Guide 197