RACOM M!DGE3, Руководство пользователя

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Slave
DLE timeout [ms]
Number {300 – 8190}, default = 1000
M!DGE3 expects a response (DLE) from the connected device (RTU) within the set timeout. If
it is not received, M!DGE3 repeats the frame according to the “Retries” setting.
Retries [No]
Number {0 – 7}, default = 3
When DLE packet is not received from the connected device (RTU) within the set DLE timeout,
M!DGE3 retransmits the frame. The number of possible retries is specified.
Priority
List box {Low; High}, default = "Low"
When the equipment sends STX and receives STX instead of DLE, there is a collision, both
equipments want to start communication. In such a case, one unit has to have a priority. If the
Priority is High, M!DGE3 waits for DLE. When it is Low, M!DGE3 send DLE.
Note
Obviously, two pieces of equipment which are communicating together must be set so
that one has High priority and the other has Low.
BCC
List box {On; Off}, default = "On"
BCC (Block Check Character) is a control byte used for data integrity control, it makes the reli-
ability higher. BCC is used by 3964R, 3964 does not use it.
M!DGE3 checks (calculates itself) this byte while receiving a packet on COM. M!DGE3 transmits
DLE (accepts the frame) only when the check result is OK. BCC byte is not transferred over
the M!DGE3 network, it is calculated locally in the end M!DGE3 and appended to the received
data.
7.1.2.3.12. SAIA S-bus
SAIA S-bus protocol was widely used by legacy RACOM radio modems in the MORSE system. The
S-Bus protocol is implemented as an access module for communication with the SAIA PCD device.
The protocol is a MASTER/SLAVE type; the MASTER does not have its own address. There can be
at most 254 SLAVEs, the address 255 is reserved for broadcast transmitting which is not acknowledged.
M!DGE3 Cellular Router – © RACOM s.r.o. 60
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