Ramsey Oretronic IV Tramp Metal Detector REC 4479C
Page 54
5.
Disconnect the receiver coil wires from field terminals marked Coil 1 on the control unit main board.
6.
Measure the resistance of the coil through the junction box. If the receiver coil resistance is greater
than 2,500 ohms, the wiring to the junction box or the junction box circuit is bad.
Installing Default Values
Note: if your system has Password Protection turned on, you must log in, in order to execute this procedure.
The log-in values is 5414.
From the Home screen, press the “Next” soft
-key, select Service. The Service menu will be displayed. From
there, select Default Settings. A confirmation screen will be displayed:
Figure 4-6.
Press the Accept soft-key to continue, otherwise press the Cancel soft-key to go back to the Service menu.
TMD IV Modbus Interface
This section provides information about the Modbus protocol implemented for communication between the
TMD IV and an intelligent host or PLC. It deals only with the protocol as used for this particular interface.
Overview of TMD IV Communications
The TMD IV Modbus interface protocol is a subset of the Modicon Modbus protocol. The physical layer uses an
asynchronous serial bus topology with an RS-485 physical data medium. Transferred data is 8-bit binary using
RTU framing and 16-bit CRC error checking.
Control is restricted to a single master/multiple slave configuration. The host or PLC must act as a Modbus
master device. Baud rates supported are: 1200, 2400, 4800, 9600, 19200, and 57600. The default is 57600 bps.
Modbus Message Types Supported by TMD IV
The TMD IV provides normal Modbus responses only for the functions listed below; all other functions and
diagnostic requests will return Exception 01 (Illegal Function).
•
Function 03
–
Read Holding Registers
