RST Instruments Ltd.
Page 8
4
RS485
C
OMMANDS
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
C
OMMAND
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
TRT
C
OMMAND
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.
