Chapter 2: Modbus PLCs Using Modbus
19
Micro 84/J375 Modbus Adapter
The J375 Modbus Adapter is a communications interface module for the Micro 84 PLC. The J375
provides one RS232C port connection for use with intelligent RS232 devices. Also, port connections
are provided for the Micro 84 controller and a P370 Micro 84 Programmer.
The Modbus Adapter provides dipswitches at the rear of its case for address and system parameter
selection. The user may select the number of stop bits, parity, and baud rate. Data bits are fixed at 7.
Switch set one (S1) on the J375 determines the station address for the Micro 84. Station addresses are
entered as binary numbers, where switch 1 is of lowest significance and switch 8 is of highest
significance.
Table 2 - Port 2 Dipswitch Settings
Switches 1, 2, 3 and 4 of switch set two (S2) are used to configure the baud rate for the J375.
Switches 5 and 6 are used to configure the parity for the J375.
Note:
When communicating with the Operator Station using ASCII Modbus, the parity selected
must be ODD or EVEN.
Switch 7 of switch set two (S2) is used to select the number of stop bits for the J375. With switch 7
set ON, two stop bits are selected. With switch 7 set OFF, one stop bit is selected.
Switch 8 of switch set two (S2) selects ASCII mode when it is OFF, or RTU mode when it is ON.
Switch Set 2 Dipswitch Settings
Summary of Contents for Cutler-Hammer PanelMate Modicon
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