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Diagnostics Optimization CT MODBUS RTU Technical Data
E300 Design Guide 409
Issue Number: 1
The drive holds its own transmitters active for up to 1 ms after it has transmitted data before switching to the receive mode; the host should not send
any data during this time.
Changing the parameters does not immediately change the serial communications settings. See Reset Serial Communications (M06) for more
details.
The silent period defines the idle time required to detect the end of a received data message. If Silent Period (M05) = 0 then the silent period is at
least 3.5 characters at the selected baud rate. This is the standard silent period for Modbus rtu. If Silent Period (M05) is non-zero it defines the
minimum silent period in milliseconds.
Changing the parameters does not immediately change the serial communications settings. See Reset Serial Communications (M06) for more
details.
When Serial Address (M01), Serial Mode (M02), Serial Baud Rate (M03), Minimum Comms Transmit Delay (M04) or Silent Period (M05) are modified
the changes do not have an immediate effect on the serial communications system. The new values are used after the next power-up or if Reset
Serial Communications (M06) is set to one. Reset Serial Communications (M06) is automatically cleared to zero after the communications system is
updated.
Keypad Port Serial Address (M07) defines the node address for the keypad port serial comms interface. Normally the default value of 1 is used, but
this can be changed if required. The keypad attached to the port will sense the address automatically.
Minimum Comms Transmit Delay (M04) Action
0 The transmitters are turned on and data transmission begins immediately after the initial delay (≥1 ms)
1 The transmitters are turned on after the initial delay (≥1 ms) and data transmission begins 1ms later
2 or more
The transmitters are turned on after a delay of at least the time specified by Minimum Comms Transmit
Delay (M04) and data transmission begins 1 ms later
M05 Silent Period
Mode Open-Loop, RFC-A, RFC-S
Minimum 0 Maximum 250
Default 0 Units ms
Type 8 Bit User Save Update Rate Read on serial communications reset
Display Format Standard Decimal Places 0
Coding RW, BU
M06 Reset Serial Communications
Mode Open-Loop, RFC-A, RFC-S
Minimum 0 Maximum 1
Default Units ms
Type 1 Bit Volatile Update Rate Background read
Display Format Standard Decimal Places 0
Coding RW, ND, NC
M07 Keypad Port Serial Address
Mode Open-Loop, RFC-A, RFC-S
Minimum 1 Maximum 16
Default 1 Units ms
Type 8 Bit User Save Update Rate Background read
Display Format Standard Decimal Places 0
Coding RW
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