DF1 half-duplex slave configuration page

Use information in the following table to configure a DF1 half-duplex slave.
DF1 half-duplex slave configuration settings
Setting
Description
Media
Specifies the supported media type.
The available options are
RS232
 and
RS485
.
RS232
 is the default option.
Control line
Specifies the type of handshake that is used for communication.
  • Select
    No handshake
     for direct point-to-point communication without a modem.
  • Select
    Half-duplex without continuous carrier (RTS/CTS)
     if both the master and slave are using half-duplex modems.
Error detection
Specifies the error detection scheme for message transmission.
  • When selecting
    BCC
    , the controller sends and accepts messages that end with a Block Check Character (BCC) byte.
  • When selecting
    CRC
    , the controller sends and accepts messages with a 2-byte Cyclic Redundancy Check (CRC).
CRC
 is the default option.
EOT suppression
Determines whether to turn on response suspension using an EOT when the master polls the slave.
Turning on EOT suppression reduces the number of modem transmissions from the slave, which is important in solar power applications but will lead the master to consider the slave as not active.
Duplicate packet detection
Determines how duplicate messages are handled.
  • Select
    Duplicate packet detection
     to ignore duplicate messages.
  • Clear
    Duplicate packet detection
     to acknowledge duplicate messages.
Duplicate packet detection
 is selected by default.
Poll timeout
Specifies the amount of time that the slave will anticipate a poll from the master following the activation of an MSG instruction.
It is applied when the slave initiates an MSG instruction.
The value is from 0 through 32767, with each unit increment representing 20 milliseconds. The default value is
3000
.
Message retries
Specifies the count of retry attempts by an slave to resend a message packet in the absence of an acknowledgment (ACK) from the master.
The parameter can be used in noisy environments, where message packets might be corrupted during transmission.
The value is from 0 through 127. The default value is 3.
Pre-transmission delay
Specifies the amount of time before the
Micro800
 controller sends the packet.
The value is from 0 through 65535. The default value is 0.
RTS off delay
Specifies the delayed amount of time between the end of a transmission and the Ready To Send (RTS) drop. It is available when
Half Duplex without continuous carrier (RTS/CTS)
 is selected for
Control line
.
The value is from 0 through 32767. The default value is 0.
RTS send delay
Specifies the delayed amount of time between the activation of RTS and the initiation of a transmission. It is available when
Half Duplex without continuous carrier (RTS/CTS)
 is selected for
Control line
.
The value is from 0 through 32767. The default value is 0.
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