Chengdu Ebyte Electronic Technology Co.,Ltd.
User Manual
Copyright ©2012–2020
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Chengdu Ebyte Electronic Technology Co.,Ltd.
39
Table 4-4 Confirmation of conditions for enabling the 485 transparent transmission function
485 transparent
transmission status
Suggest
Illustrate
Off (default)
It is recommended not
to enable this feature.
To enable this function, users need to confirm many
prerequisites, and it can only be used in systems with less
stringent requirements. See below for details
485 transparent
transmission status
Preconditions
Illustrate
Open
Used in risk-permissive
systems
1. For each packet of data: user 485 data and internal RTU data
of the product are connected to the packet, and the risk of data
confusion;
2. The acquisition channel may have abnormal acquisition;
3. The output channel may have abnormal output;
4. With different data lengths, the data packet loss rate will
show different degrees;
5. Users need to test themselves whether the stability and
tolerance in the system meet the requirements.
Packet type
Any type
Packet size
≤
240 byte (byte)
"Refresh Interval"
≥
2 seconds
Time interval for
sending packets
1. Recommendation > 2 seconds;
2. The sending time should not conflict with the refresh
interval as much as possible;
3. The refresh interval cannot be an integer multiple to prevent
data conflict. (See "Refresh Interval" value)
(3) 485 transparent transmission filtering: After this function is enabled, if the length of the user's 485 data packet is less
than the set value, it will be filtered out and will not be transmitted transparently.
1. After the "485 transparent transmission" function is enabled, the setting of "485 transparent transmission filtering" will
take effect;
2. The purpose of setting the "485 transparent transmission filter" parameter is to filter out interfering data and reduce the
error rate of the system.
(4) Correspondence between channel and target: the corresponding relationship between the channel value of the sender
and the channel value of the receiver. Details are described in the "Pairing method" section of this chapter.
4.4.3 One-to-one configuration write
(1) Method 1: Restore factory settings
A. Press and hold the "SFR" reset button for 3 seconds (as shown in Figure 4-21 below), and the "pairing method" can be
reset to the factory setting: one-to-one.
