Precision Digital PD865 - Manual (Page 32)

PD865 Snooper Modbus Serial Input Meter Instruction Manual
32
Proxy Polling Mode
Proxy Polling mode is enabled when a number greater than 1 is entered
in the PUnbr (number of PV's) menu. In this mode, the PD865 acts as a
Master and polls up to an additional 7 slave devices, enabling other
PD865s, operating in Snooper mode, to read and display that polled
data. In Proxy Polling mode, the PD865 Master always displays PV1,
the first value polled.
The baud rate for polling more than 2 variables should be set to be
greater than 4800 bps. A faster baud rate will produce fewer
communication errors and breaks.
Application Using Proxy Polling
In this application we have a system consisting of an MTS M-Series
multivariable level gauge connected to three PD865s displaying Product
Level, Interface Level, and Average Temperature.
Register Numbers & Process Variables
30001 (40001) - Product Level
30003 (40003) - Interface Level
30017 (40017) - Average Temperature