Jaton Communicator V.90 - Manual (Page 58)

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+FRS=n Wait for silence 1-255
+FTH=n Transmit HDLC data 3
+FTM=n Transmit data 24, 48, 72, 73, 74,
96, 97, 98, 121,
122, 145, 146
+FTS=n Stop transmission and pause 0-255