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Chapter Five Specifications
Man_455U Rev 1.0 Page 35
Serial Port settings
The serial port settings should be selected to match the host device. Different port settings
may be selected for different modules in the same system.
Serial data rate can be selected between 600 and 187,500 baud. If you select a rate which is
slower than the radio rate, the 455U configuration software will automatically set
transmission delay parameters in registers S18 and S19 (refer section 3.8).
To disable this feature, deselect the “PLC Mode” box. Then there will be no delay - data
bytes will be transmitted as soon as they appear in the input buffer.
The number of Data Bits can be selected as 7 or 8. The number of stop bits can be 1 or 2.
Parity can be none, even or odd.
Flow Control
“Flow control” affects the use of the CTS and RTS signals on the RS232 port. These signals
can be used to prevent overflow of the input buffer or output buffer of the 455U. The settings
should be selected to match the host device. The options for this setting are :
“None” - The RTS signal from the host is ignored and the 455U sets the CTS signal
always on.
“CTS/RTS” - input buffer flow control - the 455U will reset the CTS signal when its
input buffer is full
“XON / XOFF” the modem uses the XON and XOFF symbols to control flow of data.
This protocol should not be used with raw binary data, as the raw data may contain the
XON and XOFF characters. This flow control method is only suitable for use with ASCII
data.
DTR Control
The DTR signal on the RS232 port can be used for different functions in Acknowledged
mode:
“Ignore DTR” - the DTR signal does not perform any function
“Command Mode” - if the host resets DTR, the 455U will go into command mode - when
DTR is activated, the module will revert to on-line mode
“Command Mode, Disconnect” - as above except that the module will also force a
disconnection of the communications link
“Low Power, Disconnect” - when the host resets DTR, the module will disconnect the link
and go to low power mode. If you select the “Low Power” option in the Acknowledged mode
page, this selection of DTR will be automatically made.
DCD Control
The DCD signal on the RS232 port can be used to give an indication of communications link
status in Acknowledged mode. Note that the link is always connected in unacknowledged
mode.
“Always On” - the 455U sets the DCD to be always on