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Several examples of commands are shown below. All assume that the DPM
meter has been configured for decimal address 18 (12 hex) on the RS-485 bus:
1. To get currently selected Gas:
The DPM will reply:
!12,G<CR>
!12,G:0,AIR<CR> (assuming the
Current Gas is #0, calibrated for AIR)
2. To get current Flow Rate Alarm
status:
The DPM will reply:
!12,FA,R<CR>
!12,FAR:N<CR> (assuming no flow
alarm conditions)
3. To get a mass and volumetric flow
reading:
The DPM will reply:
!12,F<CR>
!12,50.0,50.3<CR> (assuming the mass
flow is at 50% FS)
4. Set the High and Low Flow Alarm
limit to 90% and 10% of Full Scale
flow rate:
The DPM will reply:
!12,FA,C,90.0,10.0<CR>
!12,90.00,10.00,<CR>
The global address can be used to change RS-485 address for a particular
device without local display and joystick interface with unknown address:
1. Make sure only one device (whose address must be changed) is connected
to the RS-485 network.
2. Type the memory write command with the global address:
!00,MW,118,XX,<CR> where XX, the new hexadecimal address, can be
from 01 to FF.
After the new address has been assigned, a device will accept commands with
the new address.
NOTE:
The default RS-485 address for all units is 11. Never
submit the start character with a two-character hexadecimal device
address for the RS-232 option.
NOTE:
Address 00 is reserved for global addressing. Do not assign
the global address to any device. When commands with the global
address are sent, all devices on the RS-485 bus execute the command
but do not reply with an acknowledgement message.
