YOKOGAWA 436106 User Manual

3-8
IM 04P01B01-17E
3.4 Modbus Slave Protocol Specifications
The Modbus slave protocol specifications of the recorder are as follows:
Serial Interface
Item Specifications
Transmission medium RS-422A/485
Flow control None only
Baud rate Select from 1200, 2400, 4800, 9600, 19200, or 38400 [bps]
Start bit Fixed to 1 bit
Stop bit Fixed to 1 bit
Parity check Select odd, even, or none (no parity).
Transmission mode RTU (Remote Terminal Unit) mode only
• Data length: 8 bits
• Data interval: 24 bits or less*
• Error detection: Uses CRC-16
* Determines message termination with a time interval to 3.5
characters or more.
Maximum number of Four-wire system: 32 slave devices
connected units Two-wire system: 31 slave devices
Slave Address
Address that can be set 1 to 32
Supported Functions
The function codes of the Modbus slave protocol that the recorder supports are shown
below. The recorder does not support broadcast commands.
Function Code Specifications Operation
3 Read the hold register (4xxxx). The master device reads the
communication input data
written using function codes 6
and 16.
4 Read the input register (3xxxx). The master device loads the
computed, measured, alarm,
and time data of the recordr.
6 Single write to hold register (4xxxx) The master device writes to
the communication input data
of the recorder.
8 Loopback test The master device performs a
loopback test of the recorder.
The recorder only supports
message return (test code
0x00*)
16 Write to the hold register (4xxxx) The master device writes to
the communication input data
of the recorder.
* Hexadecimal ”00”
Communication Inpur Data
You can use the communication input data by describing it in the computing equations
for the computation channels.

YOKOGAWA 436106 Specifications

General

Brand	YOKOGAWA
Model	436106
Category	Measuring Instruments
Language	English