Precidia Ether232Plus, Руководство пользователя

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Ether232 Plus User Guide 4 Configuring the Serial Port Settings
02-CML000057 Precidia Technologies Inc. 27
2
Choose Port Setting from the
Serial Port Settings
sub-menu.
You are prompted to enter one item from each column to configure the port, as
shown below.
3
Type the letter or number from each column corresponding to your desired settings,
and press
Enter
.
N
OTE
:
Serial ports communicate using the RS-232 serial (bit-stream) protocol. Each
byte of data transferred through the serial port consists of a predetermined number of
bits: 1 start bit, 7, 8, or 9 data bits, 1 or no parity bit, and 1 or 2 stop bits, for a total
between 9 and 13 bits. The port configuration “8E2”, for example, results in a 12-bit
data length consisting of 1 start bit + 8 data bits + 1 parity bit + 2 stop bits. Serial
ports on the Precidia unit, however, support only 10- and 11-bit transfers. Port
configurations of 9, 12, or 13 bits are automatically converted by adding an extra stop
bit to 9-bit transfers, and dropping stop bits and parity bits (if necessary) from 12- and
13-bit transfers.
4.3 Port Mode
Port Mode specifies the type of serial connection the Precidia unit has with the serial
device. You can choose from RS-232, RS-422, or RS-485, according to the type of
connector on the attached serial device. To ensure you are using the correct cable for
your serial device see Appendix E: Pinouts and Power Supply.
To set or change the
Port Mode
:
1
Choose Serial Port from the
Device Settings
menu.
Port configuration is made up of the several different parameters:
Bit Rate Data Width Error Detect Framing Flow Control
~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~
A. 300 8. 8 bits N. no parity 1. 1 stop bit N. none
B. 600 7. 7 bits O. odd parity 2. 2 stop bits H. h/w (rts/cts)
C. 1200 9. 9 bits E. even parity S. s/w (xon/xoff)
D. 2400 M. mark parity
E. 4800 S. space parity
F. 9600
G. 19200
H. 38400
I. 57600
J. 115200
Enter one item from each column to configure port (eg. C-7E1-H):
Choosing the Port Configuration