Wavetronix SmartSensor HD (101-0415) - User Guide Manual de usuario descargar pdf (Pagina 87)

86 APPENDIX  SMARTSENSOR HD USER GUIDE

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 of these cases.

Connector

Power

Wires

RS-485

Wires

DTE Device (PC)

DCE Device (Modem)

Null Modem Cable

Straight-through Cable

Figure D.1 – Direct Serial Connections

Note

If you do not have the right type of RS-232 physical connection you will not be able

to connect using the SmartSensor Manager software. Since null modem cables and

straight-through cables look similar, you may want to label them. Alternatively, you

may want to use a null modem adapter instead of a null modem cable. If you do,

you can turn your straight-through cable into a null modem cable by attaching the

adapter on one end.

If you wish to connect the 9-conductor cable’s RS-485 wires directly to a PC or modem, this

will require that these devices natively support RS-485 communications. Oen, modern

personal computers do not support RS-485 communications and support USB communi-

cations instead. If your computer only supports USB communications, you may want to use

a USB converter to make a direct connection.

Appendix E - Signaling Delays

Signaling delays vary depending on what equipment is used. ese delays may aect deci-

sions about where to install the sensor in relation to other equipment in cases where timeli-

ness in communication is necessary. e following is information about SmartSensor HD

signaling delays.

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Wavetronix SmartSensor HD (101-0415) - User Guide Manual de usuario Pagina 87