ApexRp Operators Manual
248083480-1 Rev 3 40
6 Program with MODBUS
Protocol
ApexRp instruments can be programmed using MODBUS Protocol.
The full protocol, as used, is detailed in Appendix A: “ApexRp 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, ApexRp reads the DIP switches.
Protocol Settings
The MODBUS Protocol is defined through an RS-232 or RS-485
interface with:
• Baud Rate: 19200
• Data Bits: 8
• Stop Bits: None
• Parity: 1
• 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
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.
the DIP switch settings,
the instrument must be
power-cycled.
starting of the sampling
accommodates systems
that do not send a START
command, but just polls
the instrument for its
data.
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