Black Box 5000 Asynchronous Channel Features, Asynchronous-Channel Switching Parameters, EIA

CHAPTER 9: Data-Channel Configuration

Table 9-11. Asynchronous Channel Features

Option		Default	Description
1.	Priority	High	Determines whether port is high or low priority in reference to other async
			ports. (Async channels always have lower priority than voice/fax or sync
			channels.) Keep the port’s setting to high priority where an interactive
			(terminal and host) connection needs quick response time. Configure for
			low priority when a fast response to data transfer is not required, such as
			for a printer.
2.	EIA Control	Enable	Offers the option of recognizing or ignoring the control signals from the
			attached device. When EIA Control is enabled, the Multiserver recognizes
			and responds to channel interface control signals. When EIA Control is
			disabled, the output is forced high and RI is forced low.
			If you are configuring DTR or Auto from the Connect Protocol Menu (see
			Section 10.7, Asynchronous-Channel Switching Parameters), EIA
			control must be enabled.
3.	Smooth Scroll	Off	This option should remain off for all devices other than DEC VT100
			Smooth Scroll terminals. When this option is on, the Multiserver requires
			an explicit X-ON character (after an X-OFF has been received) before
			transmission of data to the port is resumed.
4.	Tandem	No	The no option is for all connections except for Tandem® host
			configuration. Supports Tandem Non-Stop computer data flow operation.
			The yes option is required at the host end for Tandem support. Other
			async channel characteristics and features must also be specifically
			configured to enable Tandem computer support for a user channel. Refer
			to Appendix F for additional information, and also see Appendix B for
			Tandem cabling information.
5.	Flow Control Strip	Pass	When strip is selected, the flow control signals from the user are not
			passed by the Multiserver. This is useful in the case of X-ON/X-OFF
			characters that do not match at either end of the channel. When pass is
			selected, X-ON/X-OFF and DTR flow control output by the user is passed
			by the Multiserver to the network. DTR is output at the other end as DSR.
6.	HP ENQ/ACK	No	The no option is for all connections except for Hewlett Packard®
			HP3000™ View Systems. The yes option is required at the host and
			terminal ends for HP3000 support. (However, the no option is required for
			spool-mode printers. Flow control must be set to none in this particular
			case.) Refer to Appendix F for additional information on other
			configuration requirements for HP3000 support.
7.	Sync Loss	No	This feature offers the option of dropping the channel connection in the
	Disconnect		event the interconnect or mux link is dropped. If yes is selected, the
			Multiserver will disconnect the channel 40 seconds after the system
			senses loss of sync on the link. All data in the buffers for the port are
			discarded and all control signals are dropped. This is a valuable function
			for tail-end modem connections. If no is selected, the Multiserver will not

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