Eaton Cutler-Hammer Modbus mMINT Installation And Use Manual

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Page 4 I.L. 66A7508H05Effective September 2003RS485 Network-A is the non-inverting differential connectionfor the Modbus RTU network. RS485 Network-B is theinverting differential connection for the Modbus RTU network.Figure 4: Indicators5.0 SWITCHES AND INDICATOR LEDSRefer to Figure 4 to locate the status LED for the mMINTmodule. Figure 5 shows the location of the configurationswitches.5.1 Modbus RS485 Network Rx LED [Green]The LED will be lighted whenever the module is receiving fromthe Modbus RTU network.5.2 Modbus RS485 Network Tx LED [Green]The LED will be lighted whenever the module is transmitting onthe Modbus RTU network.5.3 INCOM Network Rx LED [Green]The LED will be lighted whenever the module is receiving fromthe INCOM network.5.4 INCOM Network Tx LED [Green]The LED will be lighted whenever the module is transmitting onthe INCOM network.5.5 Status LED [Green]This indicator will be flashing whenever the module is poweredup and the microcontroller is executing instructions. Theflashing rate is approximately 1 second ON / 1 second OFF.However, detection of a communications error on either theModbus or INCOM network will result in an increased flashingrate approximately ½ second ON / ½ second OFF. The ratewill return to normal when the network's diagnostic resetsubfunction (clear UART or slave counters, respectively) isprocessed by the mMINT. See Section 6.9 and Table 6.Figure 5: Switches5.6 INCOM 100 Ω Termination Dip Switch (SW1)This switch should be moved to the “ON” position only when itis the last unit in a chain of units or if it is a single unit.5.7 Modbus RS485 Baud Rate Dip Switch (SW2)To configure the data transfer rate for the Modbus RTUnetwork, three switches in dip switch SW2 should be moved toeither the “CLOSE” or the “OPEN” position based on the raterequired. Refer to Table 4. SW2-1 is for mMINT diagnostics.Baud SW2-1 SW2-2 SW2-31200 X CLOSE CLOSE9600 X OPEN CLOSE19200 X CLOSE OPENTable 4: RS485 Baud Rate Switches (Normal)5.8 Unique mMINT Address (SW2)The mMINT can be assigned address 247 and 248. For themMINT to respond to a diagnostic query related to address247 or 248 on the Modbus network, move dip switch SW2-1 tothe “OPEN” position. Refer to Table 5. Normally, this switch isin the “CLOSE” position.