Wavetronix SmartSensor HD (101-0415) - User Guide Manual de usuario descargar pdf (Pagina 86)

APPENDIX  SMARTSENSOR HD USER GUIDE 85

Baud Rate (bps) RS-232 RS-485

115200 40 ft. (12.2 m) 300 ft. (91.4 m)

57600 60 ft. (18.3 m) 600 ft. (182.9 m)

38400 100 ft. (30.5 m) 800 ft. (243.8)

19200 140 ft. (42.7 m) 1000 ft. (304.8 m)

9600 200 ft. (61 m) 2000 ft. (609.6 m)

Table C.2 – Maximum Cable Length for Wired Communications

To provide two independent communication channels with a homerun cable length over

200 . (61 m), convert the RS-232 data into RS-485 using a Click 304 in a pole-mount

cabinet mounted next to the sensor. In this case, the homerun connection establishes one

RS-485 channel over the normal white/blue wire pair and another RS-485 channel over the

yellow/violet wire pair. An additional Click 304 is needed to convert the data sent over the

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 cable

for RS-485 communications. For example, the Belden 3105A (Paired – EIA Industrial RS-

485 PLTC/CM) is a good alternate for the RS-485.

ere are many reliable options available for wiring power and communication connec-

tions (see Table C.3).

Length Cable Comm. Channel 1 Comm. Channel 2

0–200 ft. (0–61 m) 9-conductor or 8-con-

ductor Cable

Native RS-485 Native RS-232

200–1000 ft.

(61–304.8 m)

9-conductor or 8-con-

ductor Cable

Native RS-485 Click conversion of

RS-232 to RS-485

1000–1400 ft.

(304.8–426.7 m)

9-conductor or 8-con-

ductor 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

Table C.3 – Cable Length Options

Appendix D - Direct Serial Connections

For most applications, the service end of the 9-conductor or 8-conductor 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.

e sensor is congured as an RS-232 DTE device. To connect the 9-conductor or 8-conduc-

tor cable’s RS-232 wires directly to another DTE device (such as a PC), you can use a standard

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