ABB Bailey Power Card SPHSS03

ABB Bailey Power Card SPHSS03

Technical data of product parameters

Like SPHSS03 full-duplex protocol, DF1 radio modem allows any node to
initiate to any other node at any time (if the radio modem network
supports full-duplex data port buffering and radio transmission
collision avoidance). Like DF1 half-duplex protocol, a node ignores
any packets received that have a destination address other than its
own, with the exception of broadcast packets and passthru packets.
Unlike either DF1 full-duplex or DF1 half-duplex protocols, DF1 radio
modem protocol does not include ACKs, NAKs, ENQs, or poll
packets. Data integrity is ensured by the CRC checksum.
Using the DF1 Radio Modem SPHSS03
The DF1 radio modem driver can be configured as the system mode
driver for channel 0 using RSLogix 500 version 5.50 or later software. The Baud, Parity, Stop Bits and Error Detection selections are identical
to the other DF1 drivers. Valid Node Addresses are 0…254, just like the
DF1 half-duplex drivers. SPHSS03
The primary advantage of using DF1 radio modem protocol for radio
modem networks is in transmission efficiency. Each read/write
transaction (command and reply) requires only one transmission by
the initiator (to send the command) and one transmission by the
responder (to return the reply). This minimizes the number of times
the radios need to key-up to transmit, which maximizes radio life and
minimizes radio power consumption. In contrast, DF1 half-duplex
protocol requires five transmissions for the DF1 master to complete a
read/write transaction with a DF1 slave – three by the master and two
by the slave. SPHSS03
The DF1 radio modem driver can be used in a pseudo master/slave
mode with any radio modems, as long as the designated master node
is the only node initiating MSG instructions, and as long as only one
MSG instruction is triggered at a time.
For modern serial radio modems that support full-duplex data port
buffering and radio transmission collision avoidance, the DF1 radio
modem driver can be used to set up a masterless peer-to-peer radio
network, where any node can initiate communication to any other
node at any time, as long as all of the nodes are within radio range so
that they receive each other’s transmissions.

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