Emerson E2 Operator's Manual download pdf (Page 42)

Flashing d

Loss of Communication Mode

(continued)

Communication Troubleshooting

• DC Voltage 2.3v - 2.6v (all devices must be connected to the communications

network)

• Voltage between 485+ and 485- is typically less than 0.3vdc.

• An open wire, poor connection or misplaced jumper will affect voltage.

Communication Board Troubleshooting

The communication board is a sacrificial element to protect the main board from

damage due to voltage spikes.

• DC Voltage output 2.3 - 2.6v

• 0 volts brown to red or black to red indicate a damaged communication board.

Replace communication board (see parts list).

2.3 to 2.6 VDC

Touch

points to

measure

voltage

AE8-1337 R1

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 70 71

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Emerson E2 Operator's Manual Page 42