APG LOE Master Sensor user manual - Manual (Page 25)

Rev. B, 1/12 LOE Series
25
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Modbus
The LOE has the capability to interface with up to 10 of APG’s Modbus based
sensors. The LOE acts as the Master device, querying the Modbus sensors and
repor ng their readings to the website along with the LOE’s own readings.
NOTE: each Modbus sensor will show up on the website as a sub-sensor to
it’s LOE master. For example, if the LOE’s serial number is L00001219, then
Modbus sensor 1 would be displayed as L00001219_1 and so forth.
RS-485 Modbus Input 1 & 2
These pages are used to confi gure the parameters of Modbus sensor currently
selected (see “Sensor Number to View” under “RS_485 Network Se ngs”
page). Not all parameters are applicable to every Modbus sensor. Refer to the
Modbus sensor’s user manual for parameter descrip ons.
RS-485 Modbus Holding Registers
This page is available to view the readings of the Modbus sensor that is cur-
rently selected.
Modbus TCP/IP
Using the LOE’s IP address and port number 502, the LOE’s readings can be
polled at address number 11 on registers 30303-30304.
Example:
0001: Transac on Iden fi er
0000: Protocol Iden fi er
0006: Message Length (6 bytes to follow)
0B: The Unit Iden fi er (0B hex = 11)
04: The Func on Code (read Holding Registers)
012E: The Data Address of the fi rst register requested. (12E hex = 303)
0002: The total number of registers requested. (read 2 registers; 303 to 304)
Byte order (hex values)
00 01 00 00 00 06 0B 04 01 2E 00 02