FS-8700-32 - Modbus Tek-Air
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FieldServer Driver
FS-8700-32
Modbus Tek-Air
Description
The Tek-Air Modbus RTU driver allows the FieldServer to transfer data to and from Tek-Air devices over either RS-232 or RS-485 using the Enhanced Tek-Air Modbus RTU protocol. Modbus_Tekair is the same as Modbus_RTU, except that it has the ability to concentrate the bytes of data in the packet to create floating point values. The order in which the bytes are combined and the address range used was developed specifically for the Tek-Air/Modbus interface. To accommodate this, the driver must be configured to poll using odd numbered addresses as two integer registers are used for every floating point value. If this value is stored in a floating point data array, it will be retrievable in the correct format on the Server side. Note that the Tekair "Double" data type is not supported.
|
Fieldserver Mode |
Nodes |
Comments |
|
Client |
1 |
Only 1 client node allowed on Multidrop systems |
|
Server |
254 |
Actual electrical loading may reduce number of usable server nodes |
Formal Driver Type
Serial
Client or Server
Connection Information
|
Connection type: |
RS-232 or RS-485 (Two wire, Half-Duplex) |
|
Baud Rates: |
300; 600; 1200; 2400; 4800; 9600; 19200; 28800; 38400 Baud |
|
Data Bits: |
7,8 |
|
Stop Bits: |
1,2 |
|
Parity: |
Odd, Even, None |
|
Multidrop Capability |
Yes |
Devices tested
|
Device |
Tested (FACTORY, SITE) |
|
SmartLab Controller |
Site |
Connection configurations
Connection Notes
The actual amount of stations on a network may be limited due to electrical loading limitations.
Communications functions - Supported functions at a glance:
Data Types Supported
|
FieldServer Data Type |
Description (or Device Data Type) |
|
Analog Input |
Analog Input Registers |
|
Digital Input |
Discrete Input Registers |
|
Analog Register |
Input and Output Registers |
|
Digital Register |
Input and Output Registers |
|
Analog Output |
Analog Output Registers |
|
Digital Output |
Discrete Output Registers |
Read and Write Operations supported
|
FieldServer as a Client |
FieldServer as a Server |
|
Read Analog Status: |
Provide Analog Status: |
|
Read Output Registers (4xxxx) Read Input Registers (3xxxx) |
Provide Output Registers (4xxxx) Provide Input Registers (3xxxx) |
|
Read Binary Status: |
Provide Binary Status: |
|
Read Discrete Output Status (0xxxx) Read Discrete Input Status (1xxxx) |
Provide Discrete Output Status (0xxxx) Provide Discrete Input Status (1xxxx) |
|
Write Analog Setpoints: |
Accept Analog Setpoints: |
|
Preset Single Register (4xxxx) Preset Multiple Registers (4xxxx) |
Accept Preset Single Register (4xxxx) Accept Preset Multiple Registers (4xxxx) |
|
Write Binary Commands: |
Accept Binary Commands: |
|
Force Single Coil (0xxxx) Force Multiple Coils (0xxxx) |
Accept Force Single Coil (0xxxx) Accept Force Multiple Coils (0xxxx) |
Unsupported Functions and Data Types
|
Function |
Reason |
|
Programming messages |
FieldServer is a data transfer device, and as such, programming messages are not required |
Unsupported Devices or Protocol Options
|
Device |
Details |
|
TBD |
TBD |
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