User's Manual

20 Document Number: 0100SM1401 Issue: 10-14

Host Application to Entry

Point

Entry Point to Remote Remote to RTU

SCADA POLL

ARQ ACK

RTU RESPONSE

RTU RESPONSE RTU RESPONSE

SCADA POLL Lost

ARQ ON

Automatic Retry Example

ARQ ON

ARQ ACK

The example below shows the ARQ behavior between a pair of radios when a packet is lost during a transmission (ARQ =1).

SCADA POLL

Acknowledgement wait time

ARQ ON

SCADA POLL

(Automatic Retry)

Note: The radio will wait 500ms for an acknowledgement, before sending an automatic retry. It is

recommended that the SCADA host poll response time out time is configured to be a minimum of 3

seconds.

Part D – Feature Detail