RC Systems ST-72, Instruction Manual

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ST-72 User's Manual
Document: UM-1007 Revision Level A
29

Modbus RS-485 from up to four configured master ports connected to Modbus
slave devices.

Modbus TCP/IP connected to the Ethernet port.
Note : Each Modbus menu selection also requests the RTU # and the Alias
register # location of the data to be retrieved from the RTU. Alias register
numbers define the location of the variable representing the input value and
must be obtained from the manufacturer of the Modbus RTU device.

One of our Radio Modem kits may be connected to the Modbus RS-485 master
port to enable wireless communication to ST-48/RF wireless sensor transmitters.
See section 7.2 .
Channel’s inputs are configured using the following parameters in the
DATA FROM
MENU.
Channel 38 Config
Alarm 2
Alarm 3
Fault Alarm
Data From
Linearize
Configure ~
~
~
~
~
~
Alarm 1 ~
800
4000
10
Board Default
~
Ch. 38 Data From
Min Raw
Max Raw
Filter Sample Count
Local Cal
Marker Menu
Src Analog Input
Figure 2-17
2.4.4.1 SOURCE
Edit
toggles the
SRC
or source entry between Analog, Modbus 16bit, Modbus 16bit
Signed, Modbus 32bit, Wireless Monitor, and Digital Input . This parameter tells the ST-
72 where the information to be displayed comes from. Each 16 channel group can have
multiple sources. For example if an application needs 12 4-20 inputs and 52 Modbus
inputs the first 12 channels can be programmed for
Analog input and the last 52
channels can be programmed to accept the Modbus inputs. For Modbus 16bit, a single
register will be interpreted as an unsigned 16bit integer. For Modbus 16bit signed, a
single register will be interpreted as a signed 16bit integer. For Modbus 32bit, 2
consecutive registers are read and interpreted as a 32bit IEEE Floating Point value. In
32bit Mode, the register value is read directly and not scaled with Min/Max Raw
parameters.
2.4.4.2 MIN RAW & MAX RAW
MIN/MAX RAW
is the Min Raw and Max Raw counts entries included in Input Data
From: menus define the range of input counts that provide Measurement Range read-