Axia IP-Intercom System Podręcznik Użytkownika Pobierz pdf (Strona 28)

3: Advanced Programming • 20

Version 1.2 July 2010

mode. Of course, since our communication path is full-

duplex, we can Talk and Listen simultaneously so there

is no limitation imposed.

This web page can be used to monitor GPIO activity

in real time so it is extremely useful for troubleshooting

GPIO logic. You must have Java installed before your

web browser can display the GPIO status boxes. They

will illuminate green when active.

GPIO Ports 1 and 2 are special. Port 1 is a hardware

port and can be assigned to any Livewire GPIO function.

It can be used to communicate with other Livewire de-

vices or IP-Intercom virtual ports. Port 2 is a virtual port

used to provide “main” status of the IP-Intercom MAIN

unit itself. The pin assignments are as follows:

1 Listen mode active

2 not used

3 Ring Active (CALLSTACK)

4 Mic Muted

5 not used

In the example shown in Figure 3-8, we have shown

you a case where we have created a GPIO “snake” be-

tween two GPIO ports. In this case we have used the

loop-back IP address 127.0.0.1 and “connected” the vir-

tual MAIN port with the Hardware Port (the rear panel

15-pin GPIO connector). You can create such a relation-

ship between any Livewire GPIO ports, real or virtual.

In addition to the special functions of ports 1 and 2

we have just discussed, any of the GPIO ports may be

used to map external source logic to a physical port as

we have shown for Port 4.

The parameters for GPIO Conﬁguration follow.

Port #:

Displays the GPIO port number (ﬁxed): 1 through

10. Port 1 is the only physical port. Ports 2 through 10

are virtual ports.

Name:

Provides a box where you can label this port for your

own reference.

Channel:

This is the Livewire channel number associated a

Livewire source that has associated logic (such as a mi-

crophone in an existing Element console) or the GPIO

address and port associated with an external intercom

source. The channel number is entered manually.

Network and Quality of Service Page

The settings on this tab are advanced settings, and

generally the default settings should be used.

Livewire Clock Master

Livewire’s clocking system is automatic and largely

transparent to end users. By default, the Axia hardware

node with the lowest Ethernet IP address will be the

clock “master”. The system will automatically and trans-

parently switch to a new unit as clock master if needed.

We do however, permit you to force clock mastership

to a particular node or set certain nodes as “preferred”

for clock master while maintaining automatic opera-

tion. For example you may prefer to have nodes that are

on UPS power be preferred clock masters. Note that in

the automatic modes, the clock master is changed only

when the current master becomes unavailable (adding a

new node will not change clock master regardless of the

new node’s setting). The only exception is the 7 (Always

Master) setting.

You have the following choices for this setting:

• 0 (always slave) “STL” – Unit will never be

master and is only used with Ethernet radios.

• 0 (always slave) – This unit will never be used

as clock master.

• 3 (default) – The usual setting.

• 4 (Secondary Master) – Nodes with this setting

will be used as clock masters before those set

to 3.

• 5 (Primary Master) – Nodes set to this setting

will be used as master before those set to 4.

• 7 (Always Master) – This forces a particular

node to be clock master, even if another node

is currently clock master. If this mode becomes

available then the usual prioritization is used.

• 7 (Always Master) “STL Snake” – This forces

a particular device to be clock master. Use only

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 51 52

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