User's Manual

36
REG21: Serial Interface Setting 2 [default value: 09H]
Bits 7 – 4: Reserved
• The FDL01TU does not use this register. Keep the default value as it is.
Bit 4: Command Header
0 Use REG 10 character
1 Use Break signal
Table 5–16: Command Header
Bit 1: Flow Control
0 Software flow control (default value)
1 Hardware flow control
Table 5–18 Software/Hardware Flow Control Settings
• Selects the flow control method. This setting must match the connected terminal
equipment’s setting.
• Hardware flow control uses the two control lines RTS and CTS. When using with
the RS485 interface, be sure to set to 0.
• Software flow control uses XON and XOFF codes.
Bit 0: Flow Control 2
0 disable flow control
1 enable flow control
Table 5–31: Flow Control 2 Settings
• Enable or disable flow control between the terminal and FDL01TU modem connected
through the RS-232C serial interface.
• This function should normally be enabled, otherwise buffer overflow can occur and
data may be lost.
REG22: Serial Interface Setting 3 [default value: 00H]
Bit 7: Enable and Disable Reception
0 Enable reception at the initial state (default value)
1 Disable reception at the initial state
Table 5–19: Enable/Disable Reception
• The initial state is in reception enable. Depending on an usage of the modem, the
initial state of the modem may be better in the reception disable state. In such a case,
use this setting.