User's Manual

Page 22 FRH-SD07TU/TB Manual
3.2.3 T ra nsm it Com mand and Rece ive Header
Four transmit commands can be used in packet transmission mode (mode 3). Both text
and binary data can be sent directly from modem-to-modem or sent through a third FRH
(series) modem configured as a repeater. The receiver modem automatically determines the
transmitted data format and communication path from the information in the received packet
header. Refer to the table below for a list of the transmit commands and the corresponding
header component.
Transmit Command Receive Header Function
TXT RXT Text data transmission
TBN RBN Binary data transmission
TXR RXR Text data transmission via repeater
TBR RBR Binary data transmission via repeater
Table 3–5: Transmit Commands and Receive Headers
The following list shows each command’s syntax as issued at the sender terminal equipment
and the response displayed at the receiver terminal equipment when the packet is received.
1. Direct Text Data Transmission
transmit: @TXT [destination address]{source address}[message]
receive: RXT [source address][message] CR/LF
2. Direct Binary Data Transmission
transmit: @TBN[destination address]{source address}[message length][message] CR/LF
receive: RBN [source address][message length][message] CR/LF
3. Text Data Transmission through Repeater
transmit: @TXR [repeater address][destination address]{source address} [message] CR/LF
receive: RXR [repeater address][source address][message] CR/LF
4. Binary Data Transmission through Repeater
transmit: @TBR [repeater address][destination address]{source address}
[message length][message] CR/LF
receive: RBR [repeater address][source address][message length][message]
CR/LF
where {source address} is optional, used in RS485 mode set by serial communication cable
12 pin.
The following list defines the parameters and symbols used in the commands above:
@ = command header
CR/LF = carriage return + line feed
destination address = address of modem to receive the message (000 to 239)
Rev. 050415-01.1