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248083447-1 Rev 1 6-1
6 Program with the
MODBUS Protocol
The ApexRx family of instruments can be programmed using the
MODBUS Protocol. The full protocol, as used, is detailed in Appendix
A: “ApexRemote MODBUS Register Map v1.50” on page A-1.
This chapter contains the information needed to program the basic
configuration for the instrument using the MODBUS protocol.
DIP Switches During power-up and reset, the Serial ApexRx reads the DIP switches.
Note:
When changing
the DIP switch settings, the
instrument power must be
power-cycled.
Protocol
Settings
The MODBUS Protocol is defined through an RS-232 or RS-485
interface with:
• Baud Rate: 19200
•Data Bits: 8
• Stop Bits: 1
• Parity: None
• Flow Control: None
Power On/
Auto Start
When powering up the instrument, it will begin sampling using the
default configuration:
• Sample Time = 60 seconds
• Hold Time = 0 seconds
• Alarm Channel = Disabled
Note:
The automatic
starting of the sampling
accommodates systems
that do not send a START
command, but just polls
the instrument for its data.
To stop the sampling, send the command 12 to command register
40002.
Stopping the sampling will set the Device Status bit in Register 40003
to 0.
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