User's Manual

Page 121
7.1.2 In
In the headerless packet transmission mode, detection of the terminator is a recognition
of the end of the packet, and transmission starts. Though the terminator is set to CR/LF as the
1 er
to the p.124 MEMORY
vok e tra nsmission in hea de rless packe t
default, any desired byte or 2 byte characters can be set as the terminator. For details, ref
REGISTER SETTING, HEADERLESS TRANSMISSION MODE
.
The message data length transmittable at one time (one packet) is 255 bytes maximum.
The message data over 255 is recognized as the command error (“N0” response is
ns
“P1”. And instead of t , CTS goes ON. So,
input the subsequent transmission data after confirming that CTS goes ON, because CTS is
OFF during the transmission process.
g to
sender
ived by all receivers or
in the upper layer
sion d the data length,
including the terminator, is limited up to 255 bytes.
In the headerless packet transmission mode, continuous
transmission is impossible because this mode is fundamentally the
packet transmission mode. Since CTS is OFF during transmission,
be sure to input the subsequent transmission data after confirming that
CTS goes to ON.
In the broadcast transmission, retransmission is made until it
reaches the retransmission count. In some upper layer application
protocol, which immediately reply from the receiver side during
mission starts, CTS goes OFF instead of outputting the response
he response “P0” to complete data transmission
returned). When tra
The receiver’s address is set with the memory register or command. Broadcastin
multiple-modems is possible by setting the receiver’s address to 255. However, the
end cannot confirm whether the transmitted data are successfully rece
not, because there is no ACK packet returned from the receiver modem. In the broadcast
transmission, the sender transmits data packet number of times that the retransmission
count plus one. When successfully receiving data packet, the receiver modem outputs the
data packet to the terminal equipment without responding by ACK packet. The
retransmission packet data after the successful receipt is considered as the same packet and is
iscarded. d
In the headerless packet transmission mode, no response (P0 or
N1) is output to convey the transmission result. When resulting any
transmission failure, correction should be made
application protocol in the terminal equipment.
In the headerless packet transmission mode, the terminator is
included in the transmis ata. Be noted that
Futaba Corporation Rev. 050415-01.1