Omega Vehicle Security OMB-CHARTSCAN 1400 User Manual
Hardware
3-9
Serial Port Pin Connector Signals for RS-232/422 Applications
RxD- (Receive Data Negative) Input: This pin accepts serial data sent by an RS-232 or RS-422 device. The serial data
received is expected to match the word length, baud rate, stop bits, and parity configuration of the particular port. The signal is
low true.
received is expected to match the word length, baud rate, stop bits, and parity configuration of the particular port. The signal is
low true.
RxD+ (Receive Data Positive) Input: This pin accepts serial data sent by an RS-422 device only. The signal is high true.
TxD- (Transmit Data Negative) Output: This pin transmits serial data to an RS-232 or RS-422 device. The serial data
received is sent with the word length, baud rate, stop bits, and parity configured for the particular port. The signal is low true.
received is sent with the word length, baud rate, stop bits, and parity configured for the particular port. The signal is low true.
TxD+ (Transmit Data Positive) Output: This pin transmits serial data to an RS-422 device only. The signal is high true.
CTS- (Clear To Send Negative) Input: CTS- input is used as a hardware handshake line to prevent ChartScan from
transmitting serial data to an RS-232 or RS-422 device when it is not able to accept it. When RTS/CTS handshaking is selected,
ChartScan will not transmit data out TxD- while this signal is un-asserted (low). If XON/XOFF or no handshaking is selected,
the CTS- line is ignored when transmitting data. The signal is low true.
transmitting serial data to an RS-232 or RS-422 device when it is not able to accept it. When RTS/CTS handshaking is selected,
ChartScan will not transmit data out TxD- while this signal is un-asserted (low). If XON/XOFF or no handshaking is selected,
the CTS- line is ignored when transmitting data. The signal is low true.
CTS+ (Clear To Send Positive) Input: CTS+ input is used as a hardware handshake line to prevent ChartScan from
transmitting serial data to an RS-422 device when it is not able to accept it. The signal is high true.
transmitting serial data to an RS-422 device when it is not able to accept it. The signal is high true.
RTS- (Request To Send Negative) Output: RTS- output is used as a hardware handshake line to prevent an RS-232 or RS-422
device from transmitting serial data to ChartScan when it is not able to accept it. When automatic RTS/CTS handshaking is
selected, ChartScan will assert (high) the RTS- signal when greater than 4096 memory locations are available in its internal
buffers. If available memory drops below 4096 bytes, ChartScan unasserts (low) the RTS- signal. The signal is low true.
device from transmitting serial data to ChartScan when it is not able to accept it. When automatic RTS/CTS handshaking is
selected, ChartScan will assert (high) the RTS- signal when greater than 4096 memory locations are available in its internal
buffers. If available memory drops below 4096 bytes, ChartScan unasserts (low) the RTS- signal. The signal is low true.
RTS+ (Request To Send Positive) Output: RTS+ output is used as a hardware handshake line for an RS-422 device. The
signal is high true.
signal is high true.
GND (Ground):
This signal sets the ground reference point for the other RS-232/RS-422 input and output signals.
Ethernet Interface Configuration
Your ChartScan unit can be operated over the ethernet provided it is configured for RS-232 serial communications
and it is properly connected to a network via a Net232 ethernet/RS-232 converter. For detailed instructions refer to
Net232 User’s Guide, part number 1037-0901.
and it is properly connected to a network via a Net232 ethernet/RS-232 converter. For detailed instructions refer to
Net232 User’s Guide, part number 1037-0901.