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FIGURE 2 ECHO BACK MODE (OPEN REPEATER)
6.6.2 Chain Repeaters
If the Repeater Mode is used in conjunction with the Address Mode then a chain of modems
can be set up.
Each modem in the chain is given a receiving address and a transmitting address. The
transmitting address must be the same as the receiving address of the next modem in the
chain. The transmitting address and receiving address on each modem must be different.
MODEM 1 MODEM 2 MODEM 3
MODEM 4
REC
ADD
22 33 22
33
TRANS
ADD
33 22 33
22
The repeating modems can be used to send and receive data via their serial ports.
Alternatively they can be stand alone units just with power connected to them
FIGURE 3 REPEATER MODE
6.7
Error Correction Mode ERR
By selecting this option with a Y, a forward error correcting algorithm is brought into
operation. Redundant data bits are then inserted in the transmitted data.
If the receiving station also has the option selected, corrupt data will be detected and
corrected by means of the redundant bits. If the data is completely incoherent then the ASCII
character “CONTL E” (05h) will be loaded into the Rx serial port at the end of the message.