User Manual
Universal Serial/PROFIBUS DP Gateway
GT200-DP-RS
WWW.SSTCOMM.COM
36
Configurable parameters are shown as follows:
Starting Address, Number of Data, Mapping Address (HEX), Mapping Bit (0~7) and Type of Scan
Starting Address
: The starting address of register or switching value or loop and so on in Modbus slave and the
range is 0~65535.
Number of Data
: number of register/switching value/coil in the Modbus slave
Mapping address (HEX)
: The starting address of data in memory buffer of the module.
The address range of data mapping in the module memory:
Read command: 0x0000~ 0x00F3
Write command: 0x4000 ~ 0x40F3
When the write command is used exchanging locally, it also can use: 0x0000 ~ 0x00F3
Mapping bit (0 - 7)
: For the bit operation commands, the position range of start-bit byte is 0 ~ 7
Data filter
: There are three types of data filtering: full word, high byte, and low byte. Every register has two bytes.
Full word mapping is the process of taking the two bytes of the register into the gateway memory buffer. High
byte mapping is taking the high byte of the register into the gateway memory buffer. Low byte mapping is taking
the low byte of the register into the gateway memory buffer.
Type of scan
: There are two types of scanning modes: the fast scan and the slow scan. Slow scan is equal to the
fast scan being multiplied by the scan ratio. (Configure it in the subnet configuration interface)
Byte Swap:
There are three types of byte swapping: no swap, double-byte swap and four-byte swap. Modbus
function code 03H, 04H, 06H and 10H supports different byte swap types.
