Appendix AAPI Commands

 

 

A

- Assign Alarm Output

 

 

 

 

 

 

TYPE

System

 

 

 

EXECUTION

Deferred

 

 

 

SYNTAX

Achans,

Set alarm condition where chans is the channel(s) to assign to the digital

 

 

output

output.

 

 

 

chans may be in two forms: chan (for a single channel where

 

 

 

1 < chan < max) or first-last(for a range of channels where

 

 

 

1 < first < last < max), where max = 128 for ChartScan/1400.

 

 

 

output is the digital output number with which to associate the channel(s),

 

 

 

where 0 < output < 32.

 

 

 

A?

Query channels assigned to digital output.

 

DESCRIPTION

The Assign Alarm Output (A) command may be used to assign a particular channel, or range of channels, alarm condition(s) to a particular digital output. This command allows internal alarm conditions to be sensed by external devices via the 32 TTL-level digital outputs located on the back panel of the unit.

To use alarms, the channels in question must be part of the channel scan. Once the channels are configured (by using the C command) and made part of the scan, the alarms are active. No trigger or timebase assignment is required. Alarming is totally independent of buffered operations.

If it is desired, an alarm event for a specific channel can be used as a stimulus for a digital output signal on the back panel of the unit by using the A command to assign the channel to digital output. This signal can be used to set off an audible alarm or signal another device of the occurrence of the alarm condition.

To unassign a digital alarm condition, use 0, which is the null output number. Assigning the null output number to a channel(s) will disassociate the channel(s) from any digital output.

Thirty-two digital signals are available on the back panel of the master unit. Although analog input channels on the slave units can be used to stimulate alarms, no digital output signals are available on the slave units. Regardless of the number of slaves connected, 32 external alarm signals are available.

A channel programmed with alarm setpoints will not generate an alarm unless it is over a setpoint when the scan occurs. For example, if a channel goes above then below an alarm threshold in-between scans, it will not be detected or posted.

Alarm detection will generate an SRQ. You can then issue an alarm query (A?) which will return a 4-byte image of the 32 alarm outputs.

EXAMPLE

PRINT#1,"OUTPUT07;C1-32, 1,

‘ Configure channels 1 - 32

-100.0, 100.0, 1.0X"

 

 

PRINT#1,"OUTPUT07;A1,1X"

‘ Assign channel 1 alarm to digital output channel 1

PRINT#1,"OUTPUT07;A2-16,2X"

‘ Assign channels 2 - 16 alarms to digital output channel 2

PRINT#1,"OUTPUT07;A17-25,3X"

‘ Assign channels 17

- 25 alarms to digital output channel 3

PRINT#1,"OUTPUT07;A26-32,32X"

‘ Assign channels 26

- 32 alarms to digital output channel 32

ChartScan User’s Manual

A-21

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Image 147
Omega Vehicle Security 1400 manual Assign Alarm Output
Page 146 Page 148

1400 specifications

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