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Several examples of commands follow. All assume that the XFM has been con-
figured for address 18 (12 hex) on the RS485 bus:
1.
To get current calibration tables:
!12,G<CR>
The XFM will reply:
!12,G 0 AIR<CR> >
(Assuming Current Gas table is #0, calibrated for AIR )
2.
To get current Alarm status:
!12,A,R<CR>
The XFM will reply:
!12,N<CR> (Assuming no alarm conditions)
3.
To get a flow reading:
!12,F<CR>The XFM will reply:
!12,50.0<CR> (Assuming the flow is at 50% FS)
4.
Set the high alarm limit to 85% of full scale flow rate:
!12,A,H,85.0<CR>
The XFM will reply:
!12,AH85.0<CR>
The global address can be used to change RS-485 address for a particular device with
unknown address:
1.
Make sure only one device (which address must be changed) is connected to the
RS-485 network.
2.
Type the memory write command with global address: !00,MW,7,XX[CR] where
XX, the new hexadecimal address, can be [01 – FF].
After assigning the new address, a device will accept commands with the new address.
Note:
Address 00 is reserved for global addressing. Do not assign, the
global address for any device. When command with global address is
sent, all devices on the RS-485 bus execute the command but do not
reply with an acknowledge message.
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Note:
Do not assign the same RS-485 address for two or more
devices on the same RS-485 bus. If two or more devices with the same
address are connected to the one RS-485 network, a communication
collision will take place on the bus and communication errors will occur.
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