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8.2.5.5.1. Max. length of data packet
Function
- Defines (in bytes) max. data volume in a packet. When
reception buffer reaches declared value, the packet will be
dispatched.
Data type
- number
Range
- 0....1408
Default
value
256
Comments
- n/a
8.2.5.5.2. Data packet delimiter
Function
- Defines (in seconds) time between received characters.
Exceeding this value triggers transmission of received data.
Data type
- number
Range
- 0,00....655,35 [s]
Default
value
1,00
[s]
Comments
- n/a
8.2.5.5.3. Channel reservation time
Function
- Defines (in seconds) the time of reservation of exclusive
transmission channel to device from which the frame was
received.
Data type
- number
Range
- 0,00....655,35 [s]
Default
value
0,00
[s]
Comments
- This parameter helps set an exclusive transmission channel to
a remote device for a period of time. This enables establishing
a system consisting of several devices with functionality similar
to point-to-point.
When a channel is established, the module ignores packets
received from other devices and all data received at PORT 2
are sent to the module with which the channel is established.
Transmission costs are thus reduced significantly. Packets are
sent to all recipients only at first transmission.
The function is activated by setting the value to other than
zero thus defining the time channel is reserved. Time count
starts from receiving first GPRS packet.
Consecutive packets from same source prolong reservation
time while sent packets do not.
Setting this variable to 0 switches reservation off and module
operates in standard way sending and receiving packets to all
defined recipients.
The function of channel reservation is independent on module
access frames. Reception of such frame does not reserve the
channel. Access to module from other master is possible when
channel is reserved.
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