User manual

Operation

4.0 OPERATION

4.1 Modbus RTU

See 5.0 - Modbus Communication and Connectivity for informa-

tion about the Modbus slave.

4.2 System Reset

The OpenComms NIC-485 contains an on-board real time clock and

watchdog circuitry. The card is self-monitoring and self-correcting.

Nevertheless, a pushbutton is provided in the event that a manual

system reset in desired. The Reset pushbutton is labeled S1 on the

interface card: press and hold for 3 seconds before to releasing to ini-

tiate hardware reset.

4.3 Diagnostics

A number of LEDs are provided on the interface card to provide infor-

mation for diagnostic purposes. The following table summarizes their

indications:

Table 4 LED function indicators

LED

Identifier Description

DS1 N/A

DS2 N/A

DS3 N/A

DS4 N/A

DS5 Not used

DS6 Not used

DS7 Repeater Port Receive

DS8 IGM Port Receive

DS9 Microprocessor in Operation

DS10 Serial Port Receive

DS11 Serial Port Transmit

DS12 Repeater Port Transmit

DS13 IGM Port Transmit

DS14-19 Not used