Precision Digital PD6080 - Manual (Page 35)

PD6080/PD6081 Super Snooper Modbus Scanner Instruction Manual
35
Snooper Mode (Snoopr)
The Snooper mode is used to listen to data being transmitted on the bus. Multiple Snoopers can be
connected to the RS-485 bus and display any process variable. The same process variable can be
displayed in multiple locations. Use the menu below to configure Snooper Mode parameters.
Back To
Forward
to
PVs 1-15 move
to next PV. PV16
moves to t-resp .
Byte order is
dependent upon
data type.
Function Code
can be either
03, 04, or 65.
Register Number
is selected
by user.
Enter Slave ID
of meter to be
polled by master.
PV can be any
PV from
PV 1-PV 16.
Notes:
1. To minimize the possibility of communication errors and communication break conditions, use a poll
time of 5 seconds or more with slow baud rates (e.g. 4800 bps or less).
2. The response time for scanners set up for Snooper mode must be greater than the Master’s poll time.
This setting corresponds to the time window during which the Snooper listens to the bus for a reply by
the slave device being polled by the master device. As soon as the Snooper detects a new reply on
the bus, the display is updated. If there is no reply within the response time setting, the Snooper goes
into communications break condition.