User manual

Toolbox 32 User Manual 1.47d www.cse-semaphore.com/mykingfisher
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112
Example - Polling Data
Polling is usually performed by the master RTU in order to get a regular update of remote RTU data and to
determine if communications to the remote RTUs have failed.
The Series 2 protocol allows for full-duplex communications which means that the RTU can simultaneously
transmit and receive. However, since most radios are half-duplex, which means that the RTU cannot transmit
and receive simultaneously, it is necessary to force the RTU to wait for a reply to each transmit message.
Unless the RTU is forced to wait, it will transmit all the polling messages one after the other - which can take
a few seconds. Because of the delay, the first polling message will have timed out before the RTU is able to
receive a reply as the RTU is still busy transmitting. The following examples show how to force the RTU to
wait for a reply to each message when polling.
Basic polling
The example below polls RTUs 2, 3 and 4 every 15 minutes. The example checks that port 3 is free (ie. not
waiting for a reply to a message - #YPST3.2 ) before polling the next RTU. Note: the port number to check is
the port configured to communicate with each remote RTU as defined in the Port List.
│ │
├Poll remote RTUs every 15 minutes ┼ ┼ ┤
│ │
│DoEvery15min Poll Flag 2 │
│ #T1 #R1.2 │
├──[PERIOD]──────────────────────────────────────────────────────┬─────(S)─────┤
│ 15 Minutes │ │
│ │Poll Flag 3 │
│ │ #R1.3 │
├ ┼ ┼ ┼ ┼ ├─────(S)─────┤
│ │ │
│ │Poll Flag 4 │
│ │ #R1.4 │
├ ┼ ┼ ┼ ┼ └─────(S)─────┤
│ │
│Poll Flag 2 P3 Waiting Poll RTU2 │
│ #R1.2 #YPST3.2 RTU 2 │
├─────┤ ├─────────────────────────────────────────────────┤/├────┬──(RX_DATA)──┤
│ │ #R1 │
│ │Poll Flag 2 │
│ │ #R1.2 │
├ ┼ ┼ ┼ ┼ └─────(R)─────┤
│ │
│Poll Flag 3 P3 Waiting Poll RTU3 │
│ #R1.3 #YPST3.2 RTU 3 │
├─────┤ ├─────────────────────────────────────────────────┤/├────┬──(RX_DATA)──┤
│ │ #R1 │
│ │Poll Flag 3 │
│ │ #R1.3 │
├ ┼ ┼ ┼ ┼ └─────(R)─────┤
│ │
│Poll Flag 4 P3 Waiting Poll RTU4 │
│ #R1.4 #YPST3.2 RTU 4 │
├─────┤ ├─────────────────────────────────────────────────┤/├────┬──(RX_DATA)──┤
│ │ #R1 │
│ │Poll Flag 4 │
│ │ #R1.4 │
├ ┼ ┼ ┼ ┼ └─────(R)─────┤
│ │