Red Lion LEGEND - Manual (Page 36)

PROGRAM COMMUNICATION PORT MODULE
When communicating to a Legend Plus via the serial port, the data formats
of both units must be identical. The Baud Rate and Parity Bit/number of data
bits are selected for the data format in this module along with the Unit
Address and Serial Transmit Delay. Serial communication is covered in detail
in the SERIAL COMMUNICATIONS SECTION. The following flowchart
shows only the Communication portion:
BAUD RATE
The Baud Rates available are: 1200, 2400, 4800, and 9600 Baud.
PARITY/ NUMBER OF DATA BITS
The Parity can be ODD-7B (7data bits), EVEN-7B (7 data bits), or No
parity-8B (8 data bits). If any of the extended ASCII characters are to be
transmitted serially (used in mnemonics or in message #0 when MSG0-YES
is configured), the unit must be configured for 8 data bits (NONE-8B).
UNIT ADDRESS
The Unit Address can range from 00 to 99. This allows addressing of
multiple units on a single pair of wires and a common (RS485 only), with each
unit capable of having a different address. If only one unit is on the line an
address of zero can be used, eliminating the need for an address command.
SERIAL TRANSMIT DELAY
The Serial Transmit Delay is the minimum amount of time the Legend Plus
unit waits to transmit data to a peripheral unit. The time begins after the
Legend Plus receives a command to transmit data or when a print request is
received. The delay can be set for 0.002 or 0.100 second. This delay time
gives the software controlling an RS485 interface card time to change the
RS485 port from transmit to receive mode.
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