Modbus ASCII
Note: If multiple stations are connected to the RS-485 bus, then use the Modbus ASCII Advanced driver instead of this one.
Review the following information for setting up and configuring the Modbus ASCII driver.
Compatibility parameter | Compatible items |
|---|---|
Driver type | Serial (RS-485) |
When to use | Serial connection to a device using Modbus ASCII |
Replaces Gen 1 driver(s) | Learn more about Gen1 and Gen2 Driver Differences |
To set up and configure this device in Litmus Edge, you will need to do the following:
- Step 1: Set up and Configure the PLC Device
- Step 2: Set up the PLC Device in Litmus Edge DeviceHub
- Step 3: Configure the List of Registers
Parameter | Value |
|---|---|
Type | Modbus |
Driver | Modbus ASCII |
Device File | The file of the serial port you are using |
Baud Rate | 19200 |
Data Bits | 8 |
Parity | Select even, none, or odd |
Station ID | 0 |
Stop Bits | 1 |
Zero-Based Addressing | Select Enable or Disable |
Note: The address format in this Gen 2 driver is different from the Gen 1 driver (Modbus ASCII (Gen1)) for the same device. Learn more about Gen1 and Gen2 Driver Differences.
Name | Value Types | Address Format | Min Address | Max Address | Description |
|---|---|---|---|---|---|
D | bit | DDDDD | 0 | 65535 | Discrete Input Contacts |
C | bit | DDDDD | 0 | 65535 | Discrete Output Coils |
H | uint16, int16, int32, uint32, float32, float64 | DDDDD | 0 | 65535 | Analog Output Holding Registers |
I | uint16, int16, int32, uint32, float32, float64 | DDDDD | 0 | 65535 | Analog Input Registers |
H_bit | bit | DDDDDdd | 0 | 6553515 | Analog Output Holding Registers |
I_bit | bit | DDDDDdd | 0 | 6553515 | Analog Input Registers |