Echelon i.LON SmartServer Technical Information Page 254

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i.LON SmartServer 2.0 Programmer’s Reference
15-5
Property Description
<UCPTserialMode>
The transmission mode used by the SmartServer for
communicating with Modbus devices. The default transmission
mode is MM_RTU. You have the following two choices:
MM_RTU. Data is sent as two 4-bit, hexadecimal
characters. RTU mode provides a higher throughput than
ASCII mode at equivalent baud rates.
MM_ASCII. Data is sent as two ASCII characters. ASCII
mode provides increased flexibility in regards to the timing
sequence, as there can be up to a 1-second interval between
character transmissions without communication errors
occurring.
<UCPTretryCount>
The number of times a network message is re-sent when no
confirmation is received. The default value is 1 for Modbus
channels.
<UCPTminOfflineTime>
If a network message fails, a data point and its device are
marked offline. You can specify the <UCPTminOfflineTime>
property so that all the data points on the offline device with
pending network messages (read/write requests, polls, or
heartbeats) are marked offline and network messages are not
sent to them. This ensures that network performance is not
impacted by an offline device.
You can set the minimum period of time (in seconds) that the
SmartServer waits before transmitting network messages to
offline data points. During this period, an offline device
transmits an OFFLINE status in response to data point requests.
Once <UCPTminOfflineTime> elapses, the SmartServer sends a
read/write request to one offline data point. If the read/write
request succeeds, the data point and its device are marked
online, and all cached read/write requests for the offline data
points on the device are executed.
This property is optional. If you do not specify this property in
a Set function, the current value stored in it is erased. You must
specify this property even if you are not changing it in order to
preserve the current value.
The default <UCPTminOfflineTime> for a Modbus channel is
60 seconds.
15.1.3
Using the Set Function on Modbus Channels
You can use the Set function to overwrite the configuration of a Modbus channel, or to create a new
Modbus channel. The input parameters you supply to the function will include one or more <Item>
elements. Each <Item> element includes a <UCPTname> property that specifies a unique Modbus
channel to be created or modified.
Each <Item> element may also include a series of properties that define the configuration of the new
(or modified) Modbus channel. This set of properties is the same whether you are creating a new
Modbus channel or modifying an existing Modbus channel.
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