Check Receive Errors; Hardware Handshaking - Motorola MT2070 User Manual

Check Receive Errors

Select whether or not to check the parity, framing, and overrun of received characters. The parity value of received
characters is verified against the parity parameter selected above.
*
Check For Received Errors

Hardware Handshaking

The data interface consists of an RS-232 port designed to operate either with or without the hardware handshaking
lines, Request to Send (RTS), and Clear to Send (CTS).
Disable Standard RTS/CTS handshaking to transmit scan data as it becomes available. Select Standard RTS/CTS
handshaking to transmit scan data according to the following sequence:
•
The device reads the CTS line for activity. If CTS is asserted, the device waits up to Host Serial Response
Time-out for the host to de-assert the CTS line. If, after Host Serial Response Time-out (default), the CTS line
is still asserted, the device sounds a transmit error, and discards any scanned data.
•
When the CTS line is de-asserted, the device asserts the RTS line and waits up to Host Serial Response
Time-out for the host to assert CTS. When the host asserts CTS, the device transmits data. If, after Host
Serial Response Time-out (default), the CTS line is not asserted, the device sounds a transmit error, and
discards the data.
•
When data transmission completes, the device de-asserts RTS 10 msec after sending the last character.
•
The host should respond by negating CTS. The device checks for a de-asserted CTS upon the next
transmission of data.
During the transmission of data, the CTS line should be asserted. If CTS is deasserted for more than 50 ms
between characters, the device aborts transmission, sounds a transmission error, and discards the data.
If this communication sequence fails, the device issues an error indication. In this case, the data is lost and must be
rescanned.
If hardware handshaking and software handshaking are both enabled, hardware handshaking takes precedence.
NOTE The DTR signal is jumpered to the active state.
RS-232 Interface 8 - 11
Do Not Check For Received Errors