Wavetronix Click 500 (programmable controller) (CLK-500) - Developer Guide - Manual (Page 16)

CHAPTER 1 • USING THE CLICK 500 15
The GND, DC-, I1- and I2- ports (see Digital Inputs section) are all interconnected and
represent a common logic ground. The -DC terminal on the T-bus connector provides a
convenient termination point for DC power wiring. Likewise, the I1- and I2- terminals
provide a convenient termination point for the input common lines.
Warning
Caution should be used when installing any sensor on or around active roadways.
Serious injury can result when installation is performed using methods that are not
in accordance with authorized local safety policy and procedures. Always maintain an
appropriate awareness of the traffic conditions and safety procedures as they relate
to specific locations and installations.
Serial Communications
The four independent serial ports on the Click 500 are available through five serial port
connectors.
RS-232 Ports
The two physically independent RS-232 serial ports are accessed via the DB-9 DCE con-
nector on the front of the module and a screw terminal connector on the top of the module.
Figure 1.3 shows the pin level descriptions for the RS-232 front connector.
The RS-232 front serial port is used to develop and debug applications when the device is
in program mode. This port can also be used in run mode to interact with other devices.
For example, in run mode this port is often used to interact with the computer-based Click
Supervisor device management software.
RS-232 Front Connector
DCD
RD
TD
DTR
GND
DSR
RTS
CTS
NC
1
2
3
4
5
6
7
8
9
Figure 1.3 – RS-232 Front Connector
The left-side of Figure 1.4 shows the RS-232 pin level descriptions for the other serial port.