QSC CM16a Manual download pdf (Page 8)

FUNCTIONS, BLOCK DIAGRAM & DETAILED DESCRIPTIONS (CONTINUED)

PAGING FUNCTIONS

Input Sensitivity- Sets the sensitivity of the Page Input to either 1 Vrms or 3 Vrms. This selection should coincide with the level of the audio signal

provided for the Page Input.

DAC- This is a digital-to-analog converter that takes digital information from the internal micro controller and outputs the corresponding analog “equiv-

alent” to the appropriate channel PAGE insert points. This occurs only by instructions issued by the system operator or a custom control application.

Page Input- This is a 3-pin terminal block connector used for balanced line level page audio-signal input.

RS-232 PORT FUNCTIONS

RS-232 Port- The RS-232 (serial) port is used to communicate with the CM16a for Ethernet address set-up and other diagnostic purposes. Most users

will never have a need to access the RS232 port, but for customized networks and for troubleshooting system problems, it may be necessary.

For the RS-232 port utilities, see the Operation section, “Serial Port I/O Interface” which outlines the proper connection and communication settings

required to communicate with the CM16a via the serial (RS232) port.

If the CM16a is connected to an Ethernet network where the factory-provided IP address information is not acceptable, the IP configuration may be

changed using the RS-232 port. This involves connecting a computer with a properly configured serial port to the CM16a using a null-modem type cable

(such as a “Laplink” cable) and running a dumb-terminal program (HyperTerminal is the Microsoft® Windows- supplied program). DO NOT CHANGE

THE FACTORY SETTINGS UNLESS YOU ARE CERTAIN OF WHAT YOU ARE DOING! If addressing is configured incorrectly, the CM16a may not respond

to network control.

Note- The factory-programmed IP address is printed on a label affixed to the front panel of the CM16a. Record this IP address in a safe

place in case the label becomes lost.

CONTACT CLOSURE I/O FUNCTIONS

RLY OUT- This is a 3-pin terminal block connector used for remotely controlling an electrical device in an on/off manner (such as a cooling fan, an audi-

ble alarm, a light, etc.). An internal SPDT (single-pole, double throw) relay is controlled by software command. Its contacts are accessible at the rear

panel RLY OUT connector and are labelled:

NC (normally closed)

NO (normally open)

C (common)

RLY/TRG IN- Detects the closure (or opening) of a switch connected to the RLY/TRIG IN terminals on the rear panel. Also accepts CMOS and TTL

logic-level inputs. An example is the detection of a limit-switch that indicates an open door on an equipment cabinet.

This input may also be configured to activate (recall) certain presets without the need for a computer. Set-up for this feature is possible using the Serial

Port I/O or Telnet sessions outlined on pages 27 - 30 (ref. menu item #10).

NETWORK DESCRIPTION

QSC CM16a Amplifier Network Monitors are designed to operate on standard 10BASE-T Ethernet. Each CM16a operates as a respective node on its

network; each unit contains a programmable IP address in non volatile memory. To minimize network conflicts, each IP address should be unique. When

shipped from the factory, the CM16a’s factory-programmed IP address is printed on a label affixed to the front panel of the unit. Record the unit’s IP

address and serial number and keep in a safe place. Ethernet devices such as hubs, repeaters, switches and routers will usually afford the flexibility to

configure the network as needed.

The system controller computer on the network must have an Ethernet-compatible network interface card (NIC) installed. Additionally, if operation dur-

ing power outage or interruption is required, an uninterruptible power supply (UPS) will be required for the host computer, CM16a, and any hubs,

switches or repeaters. If the CM16a is disconnected from the network for any reason, it will continue to process audio using the last settings, assuming

AC power is uninterrupted.

The CM16a connects to the network via its RJ-45 connector on the rear panel. This allows direct connection to a 10BASE-T network. Use Category 3 (or

better) unshielded twisted pair (UTP) Ethernet Cable. Most ready-made Ethernet patch cables available today are rated at least Category 5 making

them suitable for this application.

One side note regarding Ethernet cabling: Although Category 3 data cable is called out as the minimum requirement, it is increasingly difficult to find.

Higher grades of cable are becoming the “normal stock” with the proliferation of 100BASE-T Ethernet. Category 5 Ethernet cable is the most widely

available type of data cabling as of this writing. So what does this mean? Use Category 3 if it is available and cost effective. If the cost of Category 5

cable is not prohibitive, it may be desirable to do your cabling runs with Category 5 due to its increased data rate capabilities. The extra capability may

be needed for future system expansion where 100 BASE-T devices are used. 10BASE-T capability is all that is required for the CM16a and thus the call

out for Category 3 as the minimum.

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QSC CM16a Manual Page 8

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