Precision Digital PD6730X - Manual (Page 25)

PD6730X Vantageview Super Snooper Modbus Scanner Instruction Manual
25
APPLICATION EXAMPLES
The following applications show how the scanner can be configured for common applications.
Example 1: Master Polling Multivariable Level Transmitters
In this application we have a system consisting of (4) MTS M-Series multivariable tank level gauges
connected to PD6730-AX0-I-2 displaying product level, interface level, and average temperature. The
PD6730X is setup for Master mode, and is polling the Modbus transmitters.
Note: As a tank level indicator displaying in units of feet, a PD6730-AX0-I-L could also be considered for
this application. This would display feet and inches in the upper display, and include a tank level indicator.
Example 1 Level Transmitter Setup, Register Numbers, & Process Variables
Serial Communications
Parameters Tank 1
Transmitter Tank 2
Transmitter Tank 3
Transmitter Tank 4
Transmitter
Address (Slave ID) 001 002 003 004
Baud Rate 4800 bps 4800 bps 4800 bps 4800 bps
Transmit Delay 50 ms 50 ms 50 ms 50 ms
Parity None 1 None 1 None 1 None 1
Fixed Serial Data
Parameters
MTS M-Series Transmitter Data
Level Register 30001, 30002
Interface Register 30003, 30004
Ave Temp Register 30017, 30018
Data Type Long Integer (2 registers), Binary, Signed
Byte Order 1234 (most significant digit register first)
The following table shows the PD6730X setup to work with the MTS M-Series gauges.