SmartSensor HD - Interprovincial Traffic Services

APPENDIX • SMARTSENSOR HD USER GUIDE 95RS-485 channel over the normal white/blue wire pair and another RS-485 channel overthe yellow/violet wire pair. An additional Click 304 is needed to convert the data sent overthe yellow/violet wire pair back to RS-232 before connecting to surge protection.If you elect to use an alternate cable for power, you may also want to select an alternate cablefor RS-485 communications. For example, the Belden 3105A (Paired – EIA Industrial RS-485 PLTC/CM) is a good alternate for the RS-485.There are many reliable options available for wiring power and communication connections(see Table C.3).Length Cable Comm. Channel 1 Comm. Channel 20–200 ft. (0–61 m) SmartSensor or8-conductor Cable200–1000 ft.(61–304.8 m)1000–1400 ft.(304.8–426.7 m)1400–2000 ft.(426.7–609.6 m)Table C.3 – Cable Length OptionsSmartSensor or8-conductor CableSmartSensor or8-conductor CableAlternate power &communications cableNative RS-485Native RS-485Native RS-485Native RS-485Native RS-232Click conversion ofRS-232 to RS-485N/AClick conversion ofRS-485 to RS-232Appendix D - Direct Serial ConnectionsFor most applications, the service end of the SmartSensor or 8-conductor cable terminatesin a surge protection device. However, during demonstrations, troubleshooting and certainother situations, it is sometimes convenient to bypass surge protection and connect directlyto a personal computer or communications device such as a modem.The sensor is configured as an RS-232 DTE device. To connect the SmartSensor or 8-conductorcable’s RS-232 wires directly to another DTE device (such as a PC), you can use astandard 9-pin D connector and a null modem cable. To connect directly to a DCE device(such as a modem), you will need a straight-through cable. Figure D.1 illustrates both ofthese cases.