User's Manual
99APPeNdiX
Length Cable Comm. Channel 1 Comm. Channel 2
0–200 ft. (0–61 m) SmartSensor Cable Native RS-485 Native RS-232
200–1000 ft.
(61–304.8 m)
SmartSensor Cable Native RS-485 Click! conversion of
RS-232 to RS-485
1000–1400 ft.
(304.8–426.7 m)
SmartSensor Cable Native RS-485 N/A
1400–2000 ft.
(426.7–609.6 m)
Alternate
power and
communications
cable
Native RS-485 Click! conversion of
RS-485 to RS-232
Cable Length OptionsTable A.6 –
Appendix D – Direct Serial Connections
For most applications, the service end of the SmartSensor cable terminates in a
surge protection device. However, during demonstrations, troubleshooting, and
certain other situations, it is sometimes convenient to bypass surge protection
and connect directly to a personal computer or communications device such as a
modem.
The sensor is congured as an RS-232 DTE device. To connect the SmartSensor
cable’s RS-232 wires directly to another DTE device (such as a PC), you can use
a standard 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
A.4 illustrates both of these cases.
Direct Serial ConnectionsFigure A.4 –