Omega Vehicle Security OMB-NETSCAN 1500 User Manual download pdf (Page 156)

API Command Reference

Appendix A

A-16 NetScan User’s Manual

- Assign Alarm Output

TYPE

System

EXECUTION

Deferred

SYNTAX

Achans,

output

Set alarm condition where

chans

is the channel(s) to assign to the digital

output.

chans

may be in two forms:

chan

(for a single channel where

chan

max

) or

first-last

(for a range of channels where

first

last

max

), where

max = 128

for NetScan.

output

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

where

output

Query channels assigned to digital output.

DESCRIPTION

The Assign Alarm Output (

) 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

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

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

, 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 (

) which will return a 4-byte image

of the 32 alarm outputs.

EXAMPLE

PRINT#1,"C1-32, 1, -100.0,

100.0, 1.0X"

‘ Configure channels 1 - 32

PRINT#1,"A1,1X"

‘ Assign channel 1 alarm to digital output channel 1

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

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

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

‘ Assign channels 17 - 25 alarms to digital output channel 3

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

‘ Assign channels 26 - 32 alarms to digital output channel 32

1 2 ... 151 152 153 154 155 156 157 158 159 160 161 ... 255 256

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Omega Vehicle Security OMB-NETSCAN 1500 User Manual Page 156

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