Справочник Пользователя для Pelco C1553M-B

C1553M-B (4/05)

189

The following table lists CM9760-REL relay interface unit properties that can be used in scripts and expressions. 

An operator can change the state of a relay point by working within the CM9760-REL relay unit’s Device Control dialog box in the client (refer to 
the Client Operation Manual for instructions). However, you may want to allow an operator to change the state of a relay point without opening 
the Device Control dialog box. VMX300(-E) provides the following methods:

Global Script:  Write a global script that changes the state of the specific relay point. Give the operator permission to run the global script 
and permission to control the relay unit. This method is useful when you do not want to give the operator permission to access the relay 
unit’s Device Control dialog box. Refer to the Global Scripts section for instructions on writing a global script. Refer to the User Groups 
section for instructions on assigning operator permissions.

Label or Hotlink:  Create a label or hotlink that sets the state of a specific relay point and give the operator permission to control the relay 
unit. This allows the operator to quickly change the state of a frequently accessed relay point, without having to open the Device Control 
dialog box. Refer to the Hotlinks and Labels sections for instructions on creating labels and hotlinks. Refer to the User Groups section for 
instructions on assigning operator permissions.

Relay outputs are commonly wired as normally open (N.O.), so that if the contact wires close, the relay action is triggered. When the relay is 
triggered, the relay state corresponds to “True” in VMX300(-E), whereas “False” corresponds to the normal (N.O.) state of the output. For 
example, if the relay action is to turn on a VCR, “True” equals “On” and “False” equals “Off.”

When a relay is wired as normally closed (N.C.), the relay state still corresponds to “True” in VMX300(-E), and “False” still corresponds to the 
normal state, which is N.C. in this case. 

When you define an expression in the server configuration using the relay outputs, the expression tests whether the point is “True,” regardless of 
whether the actual relay output is wired as N.O. or N.C., as shown in the following table. 

 

Table AG.  CM9760-REL Properties and Values

Read

Status

CommLoss

The device driver cannot communicate with the device.

Normal

The device is in its normal state.

Unknown

The communications status between the device driver and the device cannot be 
determined.

 Alarm

True

The relay unit is currently in an alarm state.

False

The relay unit is not in an alarm state.

Point_iii

True

The relay output numbered iii is True.*

False

The relay output numbered iii is False.*

Write

Alarm

True

Set Alarm to True to indicate the CM9760-REL is in an alarm state. CM9760-REL icons 
flash in the alarm colors when Alarm is set to True.

False

Set Alarm to False to indicate the CM9760-REL is not in an alarm state.

Point_iii

True

Set Point_iii  to True. Example: SET Relay_Unit_01.Point_001 = True

False

Set Point_iii  to False. Example: SET Relay_Unit_01.Point_001 = False

*Note that “iii” equals the relay output number, which can range from 001 to the maximum number available on the relay units (the maximum

number for one relay unit is 64; with two daisy-chained relay units the maximum number is 128, and so on).

Table AH.  Defining Normally Open and Normally Closed Relay Outputs

Open

False

True

Closed

True

False