User manual

ALM26 Series User Manual P/N 821644 Rev-A

Rear Panel Features

Section 2: Operation

(Continued)

Option Select Switch

This 10-position BCD (Binary Coded Decimal) rotary switch is used to set operation of the unit. It can be accessed using

a small flathead screwdriver or similar tool. See table below for settings.

Please note that choosing alternate scales may require a change to the scale indication silk-screening next to the bargraph

display level meters on the front panel. See page 24 (Level Meter Alternative Scales) for more information.

Port 1 Connector

This DB-25 connector (Port 1) is used to convey alarm conditions

to outboard equipment. This port has isolated contact closures,

which indicate Alarm conditions for the associated channel or

channel pair. These contacts are normally open and close on

alarm.

In units with twelve or fewer channels, each relay represents a

single channel. In units with more than twelve channels, each

relay represents a pair of channels.

A summary contact pair exists between pins 1 and 14. If any

relay pair in the unit closes, the summary contacts also close.

Example: If channel 15 or 16 trips into alarm, a contact closure

will occur between pins 9 and 21 and between pins 1 and 14 for

the duration of the alarm.

See the table to the right for connector pinout details.

NOTE: An option is available to make the relay operation

independent of the alarm indications and resets. Contact the

factory for details and instructions on enabling this option.

Power Input Connector

Attach a standard IEC-320 power cord between this connector and mains power (100 - 240VAC nominal, 50/60 Hz). The

front panel Power Indication LED (Item 5, page 10) will glow GREEN to indicate operating voltages are present.

Serial Control Connector

This connector is used for Remote Control and for software upgrades of the product. See table below for pinout information.