Aalborg Vortex - Manual (Page 85)

80
VOR
TEX METER ASCII COMMANDS SET
R
ev
. 07/29/2010
RS232/RS485
The standard VOR
TEX METER comes with an RS232 inter
face. The protocol described below allows communication with the unit using
either a custom software program or a “dumb” terminal. All values are sent as printable ASCII characters. For RS-232 inter
face
, the start character and
two characters of address have to be omitted. For the RS485 inter
face the start character is always ‘!’ and two characters of a
ddress are follow
. The com-
mand string is terminated with a carriage return (line feeds are automatically stripped out by the VOR
TEX METER:
RS-485:
!,,Arg1,Arg2,Arg3,Arg4
Example: !12,VF
RS-232:
,Arg1,Arg2,Arg3,Arg4
Example: VF
Where:
!
Start character **
Add
r
R
S485 device address in the ASCII representation of hexadecimal (00 through FF are valid).**
Cmd
The one or two character command from the table below
.
Arg1 to Arg4
The command arguments from the table below
. Multiple arguments are comma delimited.
CR
Carriage return character
.
** Default address for all units is set to 11 hex. Do not submit start character and device address for RS-232 option.
Several examples of commands follow
. All assume that the VOR
TEX METER has been configured for address 18 (12 hex) on the RS485
bus:
1.
To
get a volumetric flow reading:
!12,VF
The device will reply:
!12,50.0 (Assuming the flow is at 50.0% FS)
2.
To
get current Flow Alarm status:
!12,F
A,S
The device will reply:
!12,F
AS:N > (Assuming no alarm conditions)
3.
To
get T
o
talizer#1 reading:
!12,T
,1,R
The device will reply:
!12,T1R:93.5 (Assuming the T
o
talizer#1 reading is 93.5)
4.
Set the volumetric flow high and low alarm limit to 90% and 10% of full scale flow rate:
!12,F
A,C,V
,90.0,10.0
The device will reply:
!12, F
AC:V
,90.0,10.0
APPENDIX B