Digital ThermArray System
Installation Guide
M0036 B RST Instruments Ltd. Page
4RS485 COMMANDS
Various commands can be used to retrieve information from connected
instruments when the RS485 adaptor is connected to a computer running
communication software.
Temperature readings from the ThermArray node may be retrieved using two
command sequences. One command is sent to take a reading and one
command is sent to retrieve the reading.
4.1 TTT COMMAND
The TTT command will cause the ThermArray node to take a temperature
reading and store it in its memory. Only the most current reading is stored. The
stored reading is maintained until power is removed from the ThermArray node
or a new reading is taken.
TTT DeviceAddress CR = Entered command
TTT DeviceAddress CR = Returned string
Where:
TTT = Command to be processed
DeviceAddress = Address of ThermArray node in “decimal” format
CR = Carriage return, hex 0x0D, command termination character
4.2 TRTCOMMAND
The TRT command will cause a group of ThermArray nodes to take a
temperature reading.
TRT (DeviceNum) Addr1 Addr2 … AddrN CR = Command to be processed
TRT (DeviceNum) Addr1 Addr2 …AddrN (: Error#) CR = Returned string
Where:
DeviceNum = The number of ThermArray nodes that will be taking a
temperature reading. DeviceNum can be omitted if only one
node is to be read
Addr1…AddrN = The address of each ThermArray node that will be taking a
temperature reading. The addresses are in hex format.
(: Error#) = The nodes position in the address list will be displayed in the
returned string if a communication error occurs with a node.
