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The resulting traffic overloaded the network, resulting in deflection values losses and producing erratic motor speeds. A network designer must examine the trade–off between network traffic and end–to–end reliability, and select the messaging services accordingly. Table 3. Network Variable Summary Network Variable Type Range (in Hex) Voltage Range Joystick Hardware Description Input/Output nvoXDeflection SNVT_count 0000 – 03FF 0–5V left limit – right limit UNACKD nvoYDeflection SNVT_count 0000 – 03FF 0–5V back limit – front limit UNACKD nviXDeflection SNVT_count 0000 – 03FF 0–5V left limit – right limit nviYDeflection SNVT_count 000 – 03FF 0–5V back limit – front limit nvoUpState SNVT_lev_disc ST_OFF – ST_LOW 0–5V switch closed – switch open ACKD nvoDownState SNVT_lev_disc ST_OFF – ST_LOW 0–5V switch closed – switch open ACKD nvoOpClsState SNVT_lev_disc ST_OFF – ST_LOW 0–5V switch closed – switch open ACKD nviUpState SNVT_lev_disc ST_OFF – ST_LOW 0–5V switch closed – switch open ACKD nviDownState SNVT_lev_disc ST_OFF – ST_LOW 0–5V switch closed – switch open ACKD nviOpClsState SNVT_lev_disc ST_OFF – ST_LOW 0–5V switch closed – switch open ACKD nvoXCal SNVT_count 0000 – 03FF 0– 5 V joystick start–up x position data ACKD nvoYCal SNVT_count 0000 – 03FF 0–5V joystick start–up x position data ACKD nviXCal SNVT_count 0000 – 03FF 0–5V joystick start–up x position data ACKD nviYCal SNVT_count 0000 – 03FF 0–5V joystick start–up x position data ACKD nvoCardCode* SNVT_count 0022 programmed card code ACKD nviCardCode SNVT_count 0022 programmed card code nvoCardBcn SNVT_count 0000 – 0001 card beacon signal nvoCardBcn SNVT_count 0000 – 0001 card beacon signal nvoOnline SNVT_count 0000 – 0003 on–line sequence completion flag nviOnline SNVT_count 0000 – 0003 on–line sequence completion flag nvoSystemState SNVT_count 0000 – 0005 on–line and off–line indication to NetTalker ACKD nvoMaxLimit SNVT_count 0000 – 0005 z–motor up and down limit detection ACKD NV_play_NT150 SNVT_count 0000 – 0005 NetTalker message play variable UNACKD ACKD * Note that only one retry is specified. MOTOROLA LONWORKS TECHNOLOGY AN1266 AL–173
