Contents
INTRODUCTION
1
1 GENERAL
2
1.1 RS-232C Communications Interface
2
1.2 RS-485 Communications Interface
2
2 COMMUNICATIONS PROTOCOL
2
3 COMMUNICATIONS SPECIFICATIONS
3
4 SETTING OF COMMUNICATIONS PARAMETERS
3
4.1 Setting of Protocol
（
PtCL
）
4
4.2 Setting of Communications Function
（
FUnC
）
4
4.3 Setting of Instrument No.
（
AdrS
）
5
4.4 Setting of Transmission speed
（
rAtE
）
5
4.5 Setting of Character
（
CHAr
）
5
5 CONNECTIONS
6
5.1 Connection Precautions
6
5.2 Communications Cables
8
5.3 RS-485 Connections
10
6 MODBUS PROTOCOL
11
6.1 Message Transmission Modes
12
6.2 Data Time Interval
13
6.3 Message Configuration
13
6.4 Creating a Message
22
6.5 Function Code
24
6.6 Processing in Abnormal Status
28
6.7 Table of LT830-Reference
30
6.8 Table of Input types & SV_Dot
34
6.9 Remote SV Setting Through Communication
34
7 COMMUNICATIONS TRANSMISSION AND COMMUNICATIONS
REMOTE
35
7.1 General
35
7.2 Communications Specifications
35
7.3 Programming Communications Transmission
36
7.4 Programming Communications Remote
36
7.5 Programming Communications Transmission/Remote Parameters
37
7.6 Connections
7.7 Temperature Control Examples
39
40
