# 15 modbus.get parameters
#### Overview
The table below presents details of the modbus.get\[\]
[item](/manual/config/items/itemtypes/zabbix_agent) parameters.
#### Parameters
|Parameter|Description|Defaults|Example|
|---------|-----------|--------|-------|
|*endpoint*|Protocol and address of the endpoint, defined as `protocol://connection_string`
Possible protocol values: *rtu*, *ascii* (Agent 2 only), *tcp*
Connection string format:
with *tcp* - `address:port`
with serial line: *rtu*, *ascii* - `port_name:speed:params`
where
'speed' - 1200, 9600 etc
'params' - data bits (5,6,7 or 8), parity (n,e or o for none/even/odd), stop bits (1 or 2)|protocol: none
*rtu/ascii* protocol:
port\_name: none
speed: 115200
params: 8n1
*tcp* protocol:
address: none
port: 502|tcp://192.168.6.1:511
tcp://192.168.6.2
tcp://\[::1\]:511
tcp://::1
tcp://localhost:511
tcp://localhost
rtu://COM1:9600:8n
ascii://COM2:1200:7o2
rtu://ttyS0:9600
ascii://ttyS1|
|*slave id*|Modbus address of the device it is intended for (1 to 247), see [MODBUS Messaging Implementation Guide](https://modbus.org/docs/Modbus_Messaging_Implementation_Guide_V1_0b.pdf) (page 23)
tcp device (not GW) will ignore the field|serial: 1
tcp: 255 (0xFF)|2|
|*function*|Empty or value of a supported function:
1 - Read Coil,
2 - Read Discrete Input,
3 - Read Holding Registers,
4 - Read Input Registers|empty|3|
|*address*|Address of the first registry, coil or input.
If 'function' is empty, then 'address' should be in range for:
Coil - 00001 - 09999
Discrete input - 10001 - 19999
Input register - 30001 - 39999
Holding register - 40001 - 49999
If 'function' is not empty, the 'address' field will be from 0 till 65535 and used without modification (PDU)|empty function: 00001
non-empty function: 0|9999|
|*count*|Count of sequenced 'type' which will be read from device, where:
for Coil or Discrete input the 'type' = 1 bit
for other cases: (count\*type)/2 = real count of registers for reading
If 'offset' is not 0, the value will be added to 'real count'
Acceptable range for 'real count' is 1:65535|1|2|
|*type*|Data type:
for Read Coil and Read Discrete Input - *bit*
for Read Holding Registers and Read Input Registers:
*int8* - 8bit
*uint8* - 8bit (unsigned)
*int16* - 16bit
*uint16* - 16bit (unsigned)
*int32* - 32bit
*uint32* - 32bit (unsigned)
*float* - 32bit
*uint64* - 64bit (unsigned)
*double* - 64bit|bit
uint16|uint64|
|*endianness*|Endianness type:
*be* - Big Endian
*le* - Little Endian
*mbe* - Mid-Big Endian
*mle* - Mid-Little Endian
Limitations:
for 1 bit - be
for 8 bits - be,le
for 16 bits - be,le|be|le|
|*offset*|Number of registers, starting from 'address', the result of which will be discarded.
The size of each register is 16bit (needed to support equipment that does not support random read access).|0|4|