Onicon System-10 MODBUS Manual do Utilizador descarregar pdf (Página 28)

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System-10-MOD Network Interface Installation Guide 05/14 - 0653-10 / 18321 Page 28

SECTION 3.0: NETWORK TROUBLESHOOTING TIPS

3.1 TROUBLESHOOTING

REPORTED PROBLEM POSSIBLE SOLUTIONS

Device will not communicate with the

network controller.

• Is the Receive LED ashing on the network

board? This LED will ash whenever there

is trafc on the network. If the LED is not

ashing, look for an open network cable.

• Is the Transmit LED ashing? The Transmit

LED will only ash when the device is

responding to a poll. A unique address is

required for each device on the network.

Duplicate addresses will cause some or all of

the devices on the network to quit working.

(See section 1.6.1 of this manual for details.)

• The RS485 network cable connections are

polarity sensitive and must be connected the

same way on every device (i.e. + to + and

- to -). (See section 1.4.1 of this manual for

details.)

• The Baud rate setting must match the network

Baud rate. (See section 1.5.1 of this manual

for details.)

• Shield drain connections should be daisy

chained in the same manner as the signal

cables for RS485. The shield drain wire

should be left unterminated at the end of

the cable and connected to earth only at the

network master controller. Shield wires must

not be connected to the RS485 connector on

the System-10.

• The maximum number of devices allowed on

a RS485 network segment without a repeater

is 32. Adding more than 32 devices to a

single segment may reduce the transceiver

output voltage to a level that is too low to be

distinguished from background noise on the

cable.

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Onicon System-10 MODBUS Manual do Utilizador Página 28