SmartSensor HD - Interprovincial Traffic Services

56 CHAPTER 5 • SENSOR SETTINGS˽˽off native SSHD protocol. By default, the SS105 Protocol switch should remain on.RTMS Protocol – Allows you to turn RTMS protocol emulation on or off; only asubset of RTMS data reporting commands are emulated. This does not turn off nativeSSHD protocol. By default, the RTMS Protocol should remain off.NoteIf you are using a SmartSensor HD in an RTMS-based system, there are two waysto collect data from the sensor. If your system is set up to poll the sensor, the RTMSprotocol must be turned on so the sensor can respond to RTMS commands. If yoursystem is simply listening for data pushes from the sensor, the RTMS protocol doesnot need to be turned on. See Chapter 7 for more information on data push.˽˽˽˽RTMS ID – Allows you to enter the RTMS ID number. The RTMS ID field will onlybe editable if the RTMS Protocol switch is turned on.HW Handshaking – Turns hardware handshaking for each communication port on thesensor on or off. If you are connecting your sensor to an RS-232 device (such as somemodems), you may need to turn hardware handshaking on. These devices sometimesrequire flow control handshaking because they cannot keep up with the data rates ofhigher-performance devices like personal computers and SmartSensor HD. Smart-Sensor Manager HD and SmartSensor HD have built-in support for RS-232 flowcontrol hardware handshaking; this support allows the SmartSensor HD and Smart-Sensor Manager HD to work with these slower modem connections. Table 5.1 gives abrief description of each RS-232 line.LineTXRXRTSCTSTable 5.1 – RS-232 LinesDescriptionTransmit data lineData receive lineRequest to send flow control hardware handshaking lineClear to send flow control hardware handshaking lineFigure 5.4 shows the connections when SmartSensor HD connects directly to thecomputer running SmartSensor Manager HD.