User's Manual

CHAPTer 5 o SENSOR SETTINGS

Note

If you increase the response delay, you should also increase the additional

response wait time that SmartSensor Manager uses when communicating

to the sensor.

Advanced Comm Register –



The Advanced Comm Register on the

SmartSensor holds two seings: Simple Protocol and Flow Control.

The rst seing selects whether Simple SmartSensor protocol is enabled

or disabled. By default Simple protocol is enabled. Networks comprised of

simply one sensor can use the Simple protocol. However, if there is more

than one sensor on the network, this protocol can cause communication

messages to be broadcast unintentionally. These messages can result in

collisions and even ongoing chaer between sensors on a multi-drop

network. If you are seing up a multi-drop network of sensors, you should

connect to them one by one and disable Simple protocol. To disable Simple

protocol, select Disabled from the drop-down list. Simple protocol must

also be disabled if you plan on using RTMS protocol.

The second seing selects whether ow control handshaking is enabled

or disabled on the sensor. Flow control is a hardware handshaking

protocol used by some communication equipment. If your communication

equipment requires handshaking, you will need to enable this by selecting

RTS/CTS from the drop down menu.

Note

If you have established a serial connection, enabling RTS/CTS handshaking

will cause you to lose communication with SmartSensor Manager unless

you rst short the RTS/CTS lines on the sensor.

Data Push Setup –



Allows you to enable and congure data push.

SmartSensor communicates trac data in either Data Polled mode or

Data Push mode. By default the SmartSensor is in Data Polled mode. In

Data Polled mode, a trac data collection device must periodically poll

the sensor to retrieve the most recent information. Data Polled mode is

preferred if multiple sensors share the same data bus, so that the data

transmied over the connection will not be corrupted or lost by collisions.

In Data Push mode, the sensor is set up to transmit any new data it

generates automatically (without any prompting by the collection device).

In Data Push mode there is no arbitration of the data bus, and data

messages sent by dierent sensors can collide, causing information to be