Model S4000T
29
8.0 MODBUS Interface
8.1 Baud Rate
The Baud Rate is selectable via the Modbus Communications Interface. The
selectable baud rates are 19200, 9600, 4800, or 2400 bits per second.
8.2 Data Format
The Data Format is selectable via the Modbus Communications Interface. The
selectable data formats are as follows:
Data Bits Parity Stop Bit Format
8 None 1 8-N-1
8 Even 1 8-E-1
8 Odd 1 8-O-1
8 None 2 8-N-2
Figure 30 Data Format
8.3 Modbus Read Status Protocol (Query/Response)
8.3.1 Modbus Read Query Message
Byte
Modbus Range Referenced to S4000T
1
st
Slave Address 1-247* (Decimal) S4000T ID (Address)
2
nd
Function Code 03 Read Holding Registers
3
rd
Starting Address Hi** 00 Not Used by S4000T
4
th
Starting Address Lo** 00-FF (Hex) S4000T Commands
5
th
No. Of Registers Hi 00 Not Used by S4000T
6
th
No. Of Registers Lo 01 No. Of 16 Bit Registers
7
th
CRC Lo 00-FF (Hex) CRC Lo Byte
8
th
CRC Hi 00-FF (Hex) CRC Hi Byte
*NOTE - Address 0 is reserved for broadcast mode and will not be supported at this
time.
** NOTE - Start Address can be a maximum of 9999 Address Locations (0000-
270E).
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