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Synopsis

isConnected( srcPlug dstPlug , [iuc=boolean])

Note: Strings representing object names and arguments must be separated by commas. This is not depicted in the synopsis.

isConnected is undoable, queryable, and editable.

The isConnected command is used to check if two plugs are connected in the dependency graph. The return value is false if they are not and true if they are.
"srcPlug" specifies the source plug to check for connection.
"dstPlug" specifies the destination plug to check for connection.

Return value

boolean : Are the two plugs connected?

In query mode, return type is based on queried flag.

Related

connectAttr, connectionInfo, listConnections

Flags

iuc
Long name (short name) argument types Properties
iuc(ignoreUnitConversion) boolean create
In looking for connections, skip past unit conversion nodes.
Flag can appear in Create mode of command Flag can appear in Edit mode of command
Flag can appear in Query mode of command Flag can have multiple arguments, passed either as a tuple or a list.

Python examples

import maya.cmds as cmds

cmds.sphere( n='jupiter' )
cmds.sphere( n='io' )
cmds.connectAttr( 'jupiter.ty', 'io.ty' )

# Are the two "tx" attributes on transform1 and transform2 connected?
cmds.isConnected( 'jupiter.tx', 'io.tx' )
# Result: 0 #

# Are the two "ty" attributes on transform1 and transform2 connected?
cmds.isConnected( 'jupiter.ty', 'io.ty' )
# Result: 1 #