Black-box 5000 User Manual download pdf (Page 248)

Multiserver 5000

246

• HP port should be enabled when Term Type 10 is

configured by the CPU or the terminal user.

• Do not define the DC2 character for either

X-ON or X-OFF when using X-ON/X-OFF flow

control for Hewlett-Packard systems.

• For ENQ/ACK protocol to function properly,

one port must be set as host and the other port

as terminal.

• An HP port configured as Host cannot enter the

Command Mode.

POOL MODE (TERM TYPE 19)

The spool mode uses X-ON/X-OFF characters from

the printer to indicate status conditions to the

HP3000 system. To avoid a system timeout, disable

the HP Channel Feature for ports that use the spool

mode. Set buffer and flow control to none (using the

Channel Characteristics Menu) when HP2631 and

HP2635 printers in an HP system are to operate in

the spool mode.

Ports with flow control = none will not respond to X-

ON/X-OFF from the terminal or the computer.

Table F-1 summarizes HP and non-HP channel

configurations.

Tail-Ending Mode (Dial-Up Modem Operation)

The tail-ending mode operates only for dial-up

modems connected to terminal ports. This mode

guarantees that a Multiserver unit, upon recogni-

tion of a disconnect request from a dial-up modem,

will deliver that disconnect indication to its

associated Multiserver port (the far-end terminal or

host), even if the composite line is temporarily out

of service.

For dial-in modems, set the configuration as follows:

• EIA Control Enable

• Sync Loss Disconnect Enable

A high transition of RI on a port with enabled EIA

controls, flags the port as a dial-up modem link.

If DSR is dropped by the modem at a dial-up

modem terminal interface, the Multiserver unit will

drop all control signals to the modem (DTR, Busy,

RTS, and Unassigned). DSR is passed through the

link, either immediately or after composite

reacquisition. DSR is then held low for one second.

The outbound signals in the direction of the

modem (DTR, Busy, and RTS) are made

transparent.

At the host interface, the tail-ending mode operates

with the DTR control signal. When the host drops

DTR, the Multiserver unit will drop RI, DSR, CD,

and CTS to the host. DTR is passed to the modem

(immediately or after composite sync reacquisition)

and is held for one second, after which the

previously held controls to the host are allowed to

be passed transparently.

Inbound data, which has been buffered in the local

Multiserver unit, will be passed through to the

remote terminal or host before interface signal DSR

goes low. Outbound data, buffered for the port that

performed the disconnect, is discarded.

OTES:

• Performing a reset on a tail-ending port

terminates the Command Facility on that port.

• Tail-ending ports may not perform composite

loopback tests.

• The remote unit will not display the current

configuration for a dial-in port if the values for

this port have been changed using the Local

Channel Configuration Menu.

Table F-1. Spool Mode

User Terminal Configuration Multiserver 5000 Configuration

Flow Buffer

Type of Terminal Term Type HP Channel Control Control

HP26XX CRTs 10 Enabled X-ON/X-OFF X-ON/X-OFF

Non-HP 4 (TTY) Disabled X-ON/X-OFF X-ON/X-OFF n/a

HP2631 and HP2635 Printers 19 Disabled None None

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