Black Box 5000 manual Connect Protocol Details

Multiserver 5000

10.9 Connect Protocol Details

Connect protocol is option 1 of the Switching Parameters menu. There are three connect protocol options: Dedicated, Auto, and DTR. A discussion of the protocols and how to configure them is in Section 10.7, Asychronous Channel Switching Parameters, and Table 10-2. This section discusses how the call request, completion, and disconnect sequences operate for the dedicated, auto-answer, and DTR protocols.

Definitions:
Calling port:	Receive Inhibit	=	on
	Call Inhibit	=	off
Receiving port:	Receive Inhibit	=	off
	Call Inhibit	=	on
Dual port:	Receive Inhibit	=	off
	Call Inhibit	=	off

NOTE: The Dual port is both a calling and receiving port.

DEDICATED PROTOCOL

Call Request (Calling and Dual port)

Idle State: Multiserver holds DSR, CTS, and CD high. RI is held low.

•Data activity automatically triggers a call request.

or

•If ABR (auto baud rate) is enabled, type <cr> to trigger a call request (see Section 9.3, Asychronous Channels).

Call Completion (Receiving and Dual ports)

No indication of call completion unless the called port is an ABR port. Then the port is set to the calling port’s speed, and the sign-on character is forwarded.

Disconnect Sequence (Calling, Receiving, and Dual

ports

Calling port:

1.Device initiates

<break><break><break>.

2.Multiserver sends DISCONNECTED message.

Receiving port

1.Device initiates

<break><break><break>.

2.No indication of disconnection.

DTR PROTOCOL

Call Request (Calling and Dual ports)

Idle State: DTR can be high or low. Multiserver holds DSR, CTS, CD, and RI low.

1.Device raises or toggles DTR.

2.Multiserver then raises DSR, CTS, and CD.

3.If ABR is enabled, <cr> should now be typed (see Section 9.3, Asychronous Channels).

Call Completion

For Receiving port

Idle State: DTR must be high, otherwise the port is put out of service (OOS). In either case, the Multiserver holds DSR, CTS, CD, and RI low.

1.Multiserver raises DSR, CTS, and CD.

2.No response is required from the device.

3.If ABR is enabled, then <cr> will be forwarded.

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