Precision Digital PD6080 - Manual (Page 32)

PD6080/PD6081 Super Snooper Modbus Scanner Instruction Manual
32
Serial Communications (serial)
The scanner is equipped with RS-485 Modbus RTU serial communications.
The Serial menu is used for programming the Scanner ID, Baud Rate, Transmit Delay, Parity, and Byte-
to-Byte Timeout parameters.
To communicate with a computer or other data terminal equipment, an RS-485 to USB or RS-485 to
RS-232 converter is required; see Ordering Information on page 8 for details.
Warning!
Do not connect any equipment other than Precision Digital’s expansion
modules, cables, or scanners to the RJ45 M-LINK connector. Otherwise
damage will occur to the equipment and the scanner.
When using more than one scanner in a multi-drop mode, each scanner must be provided with its own
unique address. The scanner address (Scan ID) may be programmed between 1 and 247.
The transmit delay may be set between 0 and 4999 ms; this value must be less than (Poll Time/# of PVs).
The parity can be set to even, odd, or none with 1 or 2 stop bits.
Changes made to the Serial menu are initialized after exiting the Serial menu.
Baud Rate for the PD6080/PD6081 is entered here by user, and
must match that of other system devices. Choices are seen below.
When setting up the scanner to run on a Modbus system, the devices must be programmed with
matching Baud Rate and Parity. Failure to match up the network devices’ parameters may result in
communication breaks.
Notes:
1. The byte-to-byte timeout setting may be adjusted to fix communication errors with slow devices.
2. The Transmit Delay of the Master must be greater than the Snooper or the slave devices being
polled.