Table 4.4.: Modbus data types
Modbus Type |
Server Data Type |
|
Size |
Access Rights |
discrete input |
bool |
|
fixed |
Read-Only |
coil |
bool |
|
fixed |
Read-Write |
input register |
uint16 |
|
fixed |
Read-Only |
input register |
int16 |
|
fixed |
Read-Only |
|
|
Continued on next page . . . |
|
|
Table 4.4.: Modbus data types
Modbus Type |
Server Data Type |
Size |
Access Rights |
input register |
uint32 |
fixed |
Read-Only |
input register |
int32 |
fixed |
Read-Only |
input register |
float |
fixed |
Read-Only |
input register |
double |
fixed |
Read-Only |
input register |
bool |
fixed |
Read-Only |
input register |
time |
fixed |
Read-Only |
input register |
string |
1 – 246 |
Read-Only |
input register |
wstring |
1 – 123 |
Read-Only |
holding register |
uint16 |
fixed |
Read-Write |
holding register |
int16 |
fixed |
Read-Write |
holding register |
uint32 |
fixed |
Read-Write |
holding register |
int32 |
fixed |
Read-Write |
holding register |
float |
fixed |
Read-Write |
holding register |
double |
fixed |
Read-Write |
holding register |
bool |
fixed |
Read-Write |
holding register |
time |
fixed |
Read-Write |
holding register |
string |
1 – 246 |
Read-Write |
holding register |
wstring |
1 – 123 |
Read-Write |