User's Manual

37
• Issue the REN command to enable reception.
Bit 6: Reserved
• The FDL01TU does not use this register. Keep the default value as it is.
Bits 5 – 4: DCD (Data Carrier Detect)
Bit 5 Bit 4 Setting
0 0 Ignore DCD input; DCD output always ON (default value)
0 1 Ignore DCD input; DCD output ON at connection, OFF at disconnection
1 0 Remote modem’s DCD (IN) is transferred to local modem DCD (OUT).
(DCD Output = OFF at reset state)
1 1 Remote modem’s DCD (IN) is transferred to local modem DCD (OUT)
(DCD Output = ON at reset state)
Table 5–20: DCD Settings
Bits 3 – 2: DTR/DSR
Bit 3 Bit 2 Setting
0 0 Ignore DTR input; DSR output always ON (default value)
0 1 Ignore DTR input; DSR output ON at connection, OFF at disconnection
1 0 Remote modem DTR is transferred on local modem CTS (CTS = OFF at
reset state)
1 1 Remote DTR is transferred on local modem CTS (CTS = ON at reset
state)
Table 5–21: DTR/DSR Control Settings
Bits 1 – 0: Reserved
• The FDL01TU does not use this register. Keep the default value as it is.
REG23: Serial Interface Setting 4 [default value: 00H]
Bit 7 : reserved
• The FDL01TU does not use this register. Keep the default value as it is.
Bit 6 : Transmission buffer clear
0 Data of the transmission buffer is kept after disconnection (default value)
1 Transmission buffer is cleared when the link is disconnected.
Table 5–38 Transmission buffer clear
• Determine to clear or not to clear data stored in the transmission buffer in the data
transparent mode when the link is reconnected.
Bit 5 : reserved
• The FDL01TU does not use this register. Keep the default value as it is.