How does it work?
A PC or PLC or Microcontroller issues serial commands to a KTA-233 or KTA-234 wireless modem. The wireless modem then transmits the commands via radio to the RTU's. The RTU with an address matching the command then responds to the command. The other RTU's ignore the command.

The ASCII commands the RTU uses are in the form @AA CC X<CR> where the @ symbol is used to
define the start of a command, AA is the address of the unit from 00 to 99, CC is a two letter
command used to determine the command type and the X is a one or more characters which
determines the parameter for the command. <CR> is the carriage return character and has a value of
13.
Each time a valid command is received the unit will respond with #AA followed by any values that are
requested from the unit.

Letter Command Parameters
ON - Turn Relay On 1-6, a value of 0 Turns All Relays On at Once
OF - Turn Relay Off 1-6, a value of 0 Turns All Relays Off at Once
WR - Write to all Relays at once The parameter is a number which determines which of the
relays should be turned on or off.
RS - Status of Relays 1-6. A value of 0 Returns the Status of All Relays
IS  - Status of Inputs 1-6 A value of 0 Returns Status of All Inputs
AI - Read Analog Input 1-2 scaled between 0-1000
SA Set Address 01-99 Sets the Address of the RTU in Memory
SB Set Baud Rate 1-12 Sets the Baud Rate (See section on Communications)
SP Set Parity 0-3 Sets Parity (See section on Communications)