Asynchronous Response Mode (ARM) =This is my laptops & all my androids

Asynchronous Response Mode (ARM) is an unbalanced configuration in which secondary terminals may transmit without permission from the primary terminal. However, the primary terminal still retains responsibility for line initialization, error recovery, and logical disconnect.
Link ConfigurationsEdit

Link configurations can be categorized as being either:Unbalanced, which consists of one primary terminal, and one or more secondary terminals.Balanced, which consists of two peer terminals.The three link configurations are:Normal Response Mode (NRM) is an unbalanced configuration in which only the primary terminal may initiate data transfer. The secondary terminal transmits data only in response to commands from the primary terminal. The primary terminal polls the secondary terminal(s) to determine whether they have data to transmit, and then selects one to transmit.Asynchronous Response Mode (ARM) is an unbalanced configuration in which secondary terminals may transmit without permission from the primary terminal. However, the primary terminal still retains responsibility for line initialization, error recovery, and logical disconnect.Asynchronous Balanced Mode (ABM) is a balanced configuration in which either station may initiate the transmission.An additional link configuration is Disconnected mode. This is the mode that a secondary station is in before it is initialized by the primary, or when it is explicitly disconnected. In this mode, the secondary responds to almost every frame other than a mode set command with a "Disconnected mode" response. The purpose of this mode is to allow the primary to reliably detect a secondary being powered off or otherwise reset..

HDLC Command and response repertoireEdit

Commands (I, RR, RNR, (SNRM or SARM or SABM), DISC)Responses (I, RR, RNR, UA, DM, FRMR)

Basic Operations

Initialization can be requested by either side. When the six-mode set-command is issued. This command:Signals the other side that initialization is requestedSpecifies the mode, NRM, ABM, ARMSpecifies whether 3 or 7 bit sequence numbers are in use.The HDLC module on the other end transmits (UA) frame when the request is accepted. And if the request is rejected it sends (DM) disconnect mode frame.

Functional Extensions (Options)

For Switched CircuitsCommands: ADD – XIDResponses: ADD – XID, RDFor 2-way Simultaneous commands & responses are ADD – REJFor Single Frame Retransmission commands & responses: ADD – SREJFor Information Commands & Responses: ADD – UlFor InitializationCommands: ADD – SIMResponses: ADD – RIMFor Group PollingCommands: ADD – UPExtended AddressingDelete Response I FramesDelete Command I FramesExtended NumberingFor Mode Reset (ABM only) Commands are: ADD – RSETData Link Test Commands & Responses are: ADD – TESTRequest Disconnect. Responses are ADD – RD32-bit FCS

HDLC Comman