Fuji Electric frenic mini series User manual

MEH448d

User's Manual
for RS-485 Communications Card

Copyright © 2002-2009 Fuji Electric Systems Co., Ltd.
All rights reserved.
The copyright in this user's manual belongs to Fuji Electric Systems Co., Ltd.
This manual may not be reprinted or reproduced, in whole or in part, except as may be expressly permitted
by Fuji Electric Systems Co., Ltd.
Microsoft and Windows are registered trademarks or trademarks of Microsoft Corporation, U.S. The other
company and product names used herein are generally trademarks or registered trademarks of other
companies.
Any information contained herein is subject to change without prior notice for improvement.

i
Preface
The inverter can be connected with the keypad through RJ-45 connector (modular jack) *1,
RS-485 communications card (option) *2, and control circuit terminal base *3. Using these
connection methods, the inverter function can be expanded to such a level where RS-485
communications can be used. Use of RJ-45 connector for connection with the keypad permits
remote operation from the keypad.
*1 FRENIC-Eco/Multi/MEGA
*2 FRENIC-Mini/Eco/Multi
*3 FRENIC-MEGA
This manual describes the functional expansion. For the handling of the inverter, see each User's
Manual and Instruction Manual.
Please read through this user's manual to familiarize yourself with proper use. Improper handling or
misuse may result in malfunction, shorter service life or failure.
This user's manual describes RS-485 communications function commonly used for FRENIC-Mini,
FRENIC-Eco, FRENIC-Multi, and FRENIC-MEGA (FRENIC series).
The following shows relevant documents. Use the documents according to your purpose.
FRENIC-Mini
Name Document number Description
User's Manual MEH446
Overview of FRENIC-Mini, how to operate the keypad,
control block diagram, selection of peripherals,
capacity selection, specifications, function codes, etc.
Catalog MEH441
MEH451
Overview of FRENIC-Mini, features, specifications,
outline drawing, options, etc.
Instruction Manual INR-SI47-0791-E
INR-SI47-1205-E
Inspection at the time of product arrival, installation
and wiring, how to operate the keypad,
troubleshooting, maintenance and inspection,
specifications, etc.
RS-485 communications card
Installation Manual INR-SI47-0773 Inspection at the time of arrival, how to install the product
FRENIC-Eco
Name Document number Description
User's Manual MEH456
Overview of FRENIC-Eco, how to operate the keypad,
control block diagram, selection of peripherals,
capacity selection, specifications, function codes, etc.
Catalog MEH442 Overview of FRENIC-Eco, features, specifications,
outline drawing, options, etc.
Instruction Manual INR-SI47-0882-E
INR-SI47-1059-E
INR-SI47-1225-E
Inspection at the time of product arrival, installation
and wiring, how to operate the keypad,
troubleshooting, maintenance and inspection,
specifications, etc.
RS-485 communications card
Installation Manual INR-SI47-0872 Inspection at the time of arrival, how to install the product

ii
FRENIC-Multi
Name Document number Description
User's Manual MEH457
Overview of FRENIC-Multi, how to operate the keypad,
control block diagram, selection of peripherals,
capacity selection, specifications, function codes, etc.
Catalog MEH652
MEH653
Overview of FRENIC-Multi, features, specifications,
outline drawing, options, etc.
Instruction Manual INR-SI47-1094-E
INR-SI47-1204-E
Inspection at the time of product arrival, installation
and wiring, how to operate the keypad,
troubleshooting, maintenance and inspection,
specifications, etc.
RS-485 communications card
Installation Manual INR-SI47-1089 Inspection at the time of arrival, how to install the product
FRENIC-MEGA
Name Document
number Description
User's Manual MEH278
Overview of FRENIC-MEGA, how to operate the keypad, control
block diagram, selection of peripherals, capacity selection,
specifications, function codes, etc.
Catalog
MEH642
MEH655
MEH656
Overview of FRENIC-MEGA, features, specifications, outline
drawing, options, etc.
Instruction Manual
INR-SI47-1183-E
INR-SI47-1223-E
Inspection at the time of product arrival, installation and wiring, how
to operate the keypad, troubleshooting, maintenance and
inspection, specifications, etc.
These documents are subject to revision as appropriate. Obtain the latest versions when using the
product.

iii
 Safety Precautions
Prior to installation, connection (wiring), operation, maintenance or inspection, read through this user's
manual as well as the instruction and installation manuals to ensure proper operation of the product.
Familiarize yourself with all information required for proper use, including knowledge relating to the
product, safety information, and precautions.
This user's manual classifies safety precautions as shown below according to the severity of the
accident that may occur if you fail to observe the precaution:
Failure to heed the information indicated by this symbol may lead to dangerous
conditions, possibly resulting in death or serious bodily injuries.
Failure to heed the information indicated by this symbol may lead to dangerous
conditions, possibly resulting in minor or light bodily injuries and/or substantial
property damage.
Failure to heed the information contained under the CAUTION title can also result in serious
consequences. These safety precautions are of utmost importance and must be observed at all times.
The FRENIC-Mini/Eco is not designed for use in appliances and machinery on which lives depend.
Consult Fuji before considering the FRENIC-Mini/Eco series of inverters for equipment and machinery
related to nuclear power control, aerospace uses, medical uses or transportation. When the product is to
be used with any machinery or equipment on which lives depend or with machinery or equipment which
could cause serious loss or damage should this product malfunction or fail, ensure that appropriate
safety devices and/or equipment are installed.
Wiring
- Before starting wiring, confirm that the power is turned OFF (open).
An electric shock may result.
- The product cannot be connected directly to an RS-232C interface of a personal computer.
- Before connecting wiring to the RJ-45 connector (modular jack) for connecting the keypad,
equipped on the inverter (FRENIC-Eco) or the RJ-45 connector (modular jack) on the RS-485
communications card (option) (FRENIC-Mini), confirm the wiring of the device to be connected.
For further information, see "2.2 Connections" under Chapter 2 of this manual.
Failure may result.
Operation
- Note that the inverter starts to supply power to the motor and the motor runs upon resetting of an
alarm with the operation command ON (closed).
An accident may result.

iv
Table of Contents
CHAPTER 1 OVERVIEW1
1.1 Features ................................................................................................................................ 1-1
1.2 List of Functions .................................................................................................................... 1-2
CHAPTER 2 COMMON SPECIFICATIONS1
2.1 Specifications of RS-485 Communications ........................................................................... 2-1
2.1.1 Specification of the RJ-45 connector for RS-485 communications (modular jack) ....... 2-3
2.1.2 Specification of the terminal for RS-485 communications............................................. 2-4
2.1.3 RJ-45 connector (modular jack) for function expansion ................................................ 2-5
2.1.4 Specification of connection cable for RS-485 terminal .................................................. 2-7
2.2 Connections .......................................................................................................................... 2-8
2.2.1 Basic connection............................................................................................................ 2-8
2.2.2 Connection procedures................................................................................................ 2-11
2.2.3 Devices for connection ................................................................................................ 2-15
2.2.4 Measures against noise............................................................................................... 2-16
2.3 Switching to Communications ............................................................................................. 2-18
2.3.1 Functions for the switching .......................................................................................... 2-18
2.3.2 Link functions (operation selection) ............................................................................. 2-19
2.3.3 How to switch communications enabled/disabled ....................................................... 2-20
2.3.4 Link functions for supporting data input (operation select).......................................... 2-21
2.4 Making RS-485-related Settings ......................................................................................... 2-22
2.4.1 Link function (RS-485 setting) ..................................................................................... 2-22
2.5 Selecting the Method of Storing Communications Data...................................................... 2-25
CHAPTER 3 Modbus RTU PROTOCOL1
3.1 Messages .............................................................................................................................. 3-1
3.1.1 Message formats ........................................................................................................... 3-1
3.1.2 Message types............................................................................................................... 3-1
3.1.3 Message frames ............................................................................................................ 3-2
3.1.4 Message categories....................................................................................................... 3-4
3.1.5 Communications examples.......................................................................................... 3-11
3.2 Host Side Procedures ......................................................................................................... 3-12
3.2.1 Inverter's response time .............................................................................................. 3-12
3.2.2 Timeout processing...................................................................................................... 3-13
3.2.3 Receiving preparation complete time and message timing from the host................... 3-14
3.2.4 Frame synchronization method ................................................................................... 3-14
3.3 Communications Errors....................................................................................................... 3-15
3.3.1 Categories of communications errors.......................................................................... 3-15
3.3.2 Operations in case of errors ........................................................................................ 3-16
3.4 CRC-16................................................................................................................................ 3-19
3.4.1 Overview of the CRC-16.............................................................................................. 3-19
3.4.2 Algorithm...................................................................................................................... 3-19
3.4.3 Calculation example .................................................................................................... 3-21
3.4.4 Frame length calculation.............................................................................................. 3-22

v
Chap. 1 Chap. 2 Chap. 3 Chap. 4 Chap. 5
CHAPTER 4 FUJI GENERAL-PURPOSE INVERTER PROTOCOL1
4.1 Messages .............................................................................................................................. 4-1
4.1.1 Message formats ........................................................................................................... 4-1
4.1.2 Transmission frames ..................................................................................................... 4-2
4.1.3 Descriptions of fields.................................................................................................... 4-11
4.1.4 Communications examples.......................................................................................... 4-13
4.2 Host Side Procedures ......................................................................................................... 4-15
4.2.1 Inverter's response time .............................................................................................. 4-15
4.2.2 Timeout processing...................................................................................................... 4-16
4.2.3 Receiving preparation complete time and message timing from the host................... 4-16
4.3 Communications Errors....................................................................................................... 4-17
4.3.1 Categories of communications errors.......................................................................... 4-17
4.3.2 Operations in case of communications errors ............................................................. 4-18
CHAPTER 5 FUNCTION CODES AND DATA FORMATS1
5.1 Communications Dedicated Function Codes ........................................................................ 5-1
5.1.1 About communications dedicated function codes ......................................................... 5-1
5.1.2 Command data .............................................................................................................. 5-2
5.1.3 Monitor data 1 ................................................................................................................ 5-9
5.1.4 Information displayed on the keypad........................................................................... 5-15
5.2 Data Formats....................................................................................................................... 5-26
5.2.1 List of data format numbers ......................................................................................... 5-26
5.2.2 Data format specifications ........................................................................................... 5-47
===Appendix===1
CHAPTER 6 FLOOR LEVEL NETWORK (P1 PROTOCOL)1
6.1 Messages .............................................................................................................................. 6-1
6.1.1 polling/selecting ............................................................................................................. 6-1
6.2 Point Database...................................................................................................................... 6-1
6.3 Setting up Communications of the FRENIC-Eco .................................................................. 6-1
6.4 Using the FRENIC-Eco ......................................................................................................... 6-2
6.5 Strategies .............................................................................................................................. 6-3
6.5.1 Monitoring ......................................................................................................................6-3
6.5.2 Supervisory Control ....................................................................................................... 6-3
6.5.3 Slaving the Drive............................................................................................................ 6-4
6.6 Other Functionality ................................................................................................................ 6-4
6.6.1 Start and stop the drive.................................................................................................. 6-4
6.6.2 Change drive directions................................................................................................. 6-4
6.6.3 Lock the FRENIC-Eco panel.......................................................................................... 6-4
6.6.4 Digital Outputs ............................................................................................................... 6-4
6.6.5 Analog Inputs monitor.................................................................................................... 6-5
6.6.6 Loop gains ..................................................................................................................... 6-5
6.6.7 Reading and resetting faults.......................................................................................... 6-5
6.6.8 Address limitations......................................................................................................... 6-5
6.6.9 Point 90,91,92,93 Read/Write Parameter Number (Parameter Data)......................... 6-10
6.6.10 Reading and Writing from/to Inverter's Function Codes.............................................. 6-11

vi
CHAPTER 7 Metasys N2 (N2 PROTOCOL)1
7.1 Messages .............................................................................................................................. 7-1
7.1.1 Transmission Specification ............................................................................................ 7-1
7.1.2 polling/selecting ............................................................................................................. 7-1
7.2 Setting up Communications of the FRENIC-Eco .................................................................. 7-1
7.3 Point mapping tables............................................................................................................. 7-2
7.4 Read / Write Parameter......................................................................................................... 7-3
7.5 Support Command List.......................................................................................................... 7-4

CHAPTER 1
OVERVIEW
This chapter describes the functions that can be realized by performing RS-485 communications.
Table of Contents
1.1 Features ................................................................................................................................ 1-1
1.2 List of Functions .................................................................................................................... 1-2

1.1 Features
1-1
Chap. 1 OVERVIEW
1.1 Features
The functions listed below can be implemented using RS-485 communications.
- The keypad can be mounted on the easy-to-access front of control panel with an extension
cable (option).
- The function code data of the inverter can be edited and the operation status of the inverter
can be monitored by connecting it to a personal computer on which inverter support software
runs (see the "FRENIC Loader Instruction Manual").
- The inverter can be controlled as a subordinate device (slave) by connecting it to an upper
level device (host (master)) such as a PLC or personal computer.
As the communications protocols for controlling inverter, the Modbus RTU widely used by a
variety of appliances, and the Fuji general-purpose inverter protocol common to Fuji's inverters
are available.
Modbus RTU protocol
The Modbus RTU protocol is a set of communications specifications defined to connect Modicon's
PLCs (Programmable Logic Controllers) in a network. A network is established between PLCs or
between a PLC and another slave unit(s) (inverter(s), etc.). The main functions include:
- supporting both a query-response format and a broadcast format for messages.
- enabling the host unit as the master to transmit queries to each inverter as a slave, and each
slave to send back responses to the queries to the master.
- supporting two modes, RTU mode and ASCII mode, as transmission mode for the standard
Modbus Protocol. FRENIC-Mini/Eco/Multi supports the RTU mode only, which provides a
high transmission density.
- performing an error check through a CRC (cyclic redundancy check) to ensure accurate data
transmission.
Fuji general-purpose inverter protocol
This protocol is commonly used for all models of Fuji's general-purpose inverters. The main
functions include:
- enabling, as a common protocol, operation of all models of Fuji's general-purpose inverters
with the same host program (function codes cannot be generally edited because
specifications are different among models).
- adopting fixed-length transmission frames as standard frames to facilitate developing
communications control programs for hosts.
- reducing the communications time in response to operation commands and frequency
setting which are required quick response by using optional transmission frames.
- Since the protocol switches to the keypad dedicated protocol automatically by
connecting the keypad, it is not necessary to set up the communications- related
functions.
- Although the FRENIC Loader uses a dedicated protocol for loader commands, part o
f
the communications conditions must be set. (For further information, see the
" FRENIC Loader Instruction Manual.")
- With regard to a FRENIC-Mini that uses inverter ROM 0399 or earlier version, part
of the RTU protocol functions are restricted. Contact us for these restrictions.
Confirm the ROM version according to the menu "
5_14 " described in "3.2.2 [5]
Reading Maintenance Information" under Chapter 3 of the FRENIC-Mini Instruction
Manual (INR-SI47-0791-E).

1-2
1.2 List of Functions
The functions listed below become available by operating the appropriate function codes from
the host controller.
The chapters that follow describe these functions in detail.
Table 1.1 List of RS-485 communications functions
Function Description
Related
function
code
Operation The functions equivalent to the terminal functions shown below can be
executed through communications:
-Forward operation command "FWD" and reverse operation
command "REV"
-Digital input commands ([FWD], [REV], [X1] - [X9] terminals)
(The number of X terminals varies with the inverter model.)
-Alarm reset command ("RST")
Frequency
setting
Either of the following three setting methods can be selected:
-Set up as "±20000/maximum frequency."
-Frequency (adjustable unit: 0.01 Hz) without polarity
-Rotation speed (adjustable unit: 1r/min) Only MEGA has a polarity.
PID command -Set up as "±20000/100%."
S codes
(dedicated
to communi-
cations)
Operation
monitor
The items below can be monitored:
-Frequency command
-Actual values (frequency, current, voltage, etc.)
-Operation status, information on general-purpose output terminals,
etc.
Maintenance
monitor
The items below can be monitored:
-Cumulative operation time, DC link voltage
-Information to determine the service life of parts to be periodically
replaced (main circuit capacitor, PC board capacitor, cooling fan)
-Model codes, capacity codes, ROM version, etc.
Alarm monitor The items below can be monitored:
-Monitoring alarm history (last four alarms)
-Monitoring information when an alarm occurs (last four alarms)
Operation information (output/set frequencies, current, voltage,
etc.)
Operation status, information on general-purpose output terminals
Maintenance information (cumulative operation time, DC link
voltage, heat sink temperature, etc.)
M codes
W codes
X codes
Z codes
(dedicated
to
communica-
tions)
Function code All types of function code data can be monitored and changed. All function
codes other
than above

CHAPTER 2
COMMON SPECIFICATIONS
This chapter describes the specifications common to the Modbus RTU protocol, Fuji general-purpose
inverter protocol, and loader protocol. For further information about the specific specifications of each
protocol, see Chapter 3 "Modbus RTU Protocol" and Chapter 4 "Fuji General-purpose Inverter
Protocol."
Table of Contents
2.1 Specifications of RS-485 Communications ........................................................................... 2-1
2.1.1 Specification of the RJ-45 connector for RS-485 communications (modular jack) ....... 2-3
2.1.2 Specification of the terminal for RS-485 communications............................................. 2-4
2.1.3 RJ-45 connector (modular jack) for function expansion ................................................ 2-5
2.1.4 Specification of connection cable for RS-485 terminal .................................................. 2-7
2.2 Connections .......................................................................................................................... 2-8
2.2.1 Basic connection............................................................................................................ 2-8
2.2.2 Connection procedures................................................................................................ 2-11
2.2.3 Devices for connection ................................................................................................ 2-15
2.2.4 Measures against noise............................................................................................... 2-16
2.3 Switching to Communications ............................................................................................. 2-18
2.3.1 Functions for the switching .......................................................................................... 2-18
2.3.2 Link functions (operation selection) ............................................................................. 2-19
2.3.3 How to switch communications enabled/disabled ....................................................... 2-20
2.3.4 Link functions for supporting data input (operation select).......................................... 2-21
2.4 Making RS-485-related Settings ......................................................................................... 2-22
2.4.1 Link function (RS-485 setting) ..................................................................................... 2-22
2.5 Selecting the Method of Storing Communications Data...................................................... 2-25

2-2

2.1 Specifications
2-1
Chap. 2 COMMON SPECIFICATIONS
2.1 Specifications of RS-485 Communications
Table 2.1 shows the specifications of RS-485 communications.
Table 2.1 RS-485 communications specifications
Item Specification
Protocol FGI-BUS Modbus RTU Loader commands
Complying with Fuji general-purpose
inverter protocol
Modicon Modbus
RTU-compliant (only in
RTU mode only)
Special commands
dedicated to inverter
support loader software
(not disclosed)
No. of supporting
stations
Host device: 1
Inverters: up to 31
Physical level EIA /RS-485
Connection to
RS-485
Connect using an 8-wire RJ-45 connector or
terminal block
8-wire RJ-45 connector
Synchronization
method of character
Start-Stop system
Transmission mode Half-duplex
Transmission speed
(bps)
2400, 4800, 9600, 19200 and 38400 (maximum 19200 for FRENIC-Mini)
Maximum
transmission cable
length
500m
No. of available
station addresses
1 to 31 1 to 247 1 to 255
Message frame
format
FGI-BUS Modbus RTU Loader command
Synchronization
method of
transmission frames
Detection SOH (Start Of
Header) character
(SOH 01H)
Detection of no-data
transmission time for 3
byte period
Start code 96H
detection
Frame length Normal transmission:
16 bytes (fixed)
High-speed transmission:
8 or 12 bytes
Variable length Variable length
Maximum transfer
data
Write: 1 word
Read: 1 word
Write: 50 words
Read: 50 words
FRENIC-MEGA
Write: 100 words
Read: 100 words
Write: 41 words
Read: 41 words
Messaging system Polling/Selecting/Broadcast Command message
Transmission
character format
ASCII Binary Binary
Character length 8 or 7 bits (selectable by
the function code)
8 bits (fixed) 8 bits (fixed)
Parity Even, Odd, or None (selectable by the function
code)
Even
Stop bit length 1 or 2 bits (selectable by
the function code)
No parity: 2 bits
Even or Odd parity:
1 bit
1 bit (fixed)
Error checking Sum-check CRC-16 Sum-check

2-2
Table 2.2 Connection method and applicable protocol for FRENIC series
Applicable protocol *1
Model
Communications
means
Connection
port
Hardware
specifications
for connection
port
Port type Keypad*2 Loader Modbus
RTU*3
Fuji
general-purpose
inverter protocol
FRENIC
-Mini
RS-485
communications
card (option)
RJ-45
connector See 2.1.1. Standard port 
Inverter-keypad
coupling
connector
RJ-45
connector See 2.1.1. Standard port 
FRENIC
-Eco*4 RS-485
communications
card (option)
Terminal
block See 2.1.2. Extension port ××
Inverter-keypad
coupling
connector
RJ-45
connector See 2.1.1. Standard port 
FRENIC
-Multi RS-485
communications
card*4 (option)
RJ-45
connector
for function
expansion
(2 pc)
See 2.1.3. Extension
port ××
Inverter-keypad
coupling
connector
RJ-45
connector See 2.1.1. Standard port 
FRENIC
-MEGA
Standard port Terminal
block See 2.1.2. Extension port ××
*1 The protocol support ranges such as keypad monitoring items, loader functions, and accessible
function codes differ depending on the inverter type. For details, see the instruction manual for
each protocol.
*2 The applicable keypad depends on the inverter type.
Multi-function keypad
Remote keypad
Series
TP-E1 TP-M1 TP-E1U
TP-G1 TP-G1-J1
FRENIC-Mini  × × × ×
FRENIC-Eco  × ×  
FRENIC-Multi ×  ×  
FRENIC-MEGA × ×  × 
*3 The Modbus RTU used for FRENIC-Mini does not support the coil commands. See "Chapter 3
Modbus RTU PROTOCOL " for details.
*4 N2 Protocol is applicable only with FRN□□F1□-□A, FRN□□F1□-□C, FRN□□F1□-□E and
FRN□□F1□-□U. Refer to INR-SI47-1322-E

2.1 Specifications
2-3
Chap. 2 COMMON SPECIFICATIONS
2.1.1 Specification of the RJ-45 connector for RS-485
communications (modular jack)
The RS-485 communications port of the FRENIC-Mini's RS-485 communications card (option)
and the RS-485 communications port for connecting the keypad equipped on the
FRENIC-Eco/Multi are the RJ-45 connectors with the pin assignment shown below.
Pin No. Signal name Function Remarks
1, 8 Vcc Power source for the keypad 5V
2, 7 GND Reference voltage level Ground (0V)
3, 6 NC No connection −
4 DX- RS-485 communications data (-)
5 DX+
RS-485 communications data (+)
A terminating resistor of 112
is incorporated. Connection/
cut off is selected by a
switch*1.
*1 For the details of the switch, refer to 2.2.2 [2] “About terminating resistors”.
A power supply for the keypad is connected to the RJ-45 connector for RS-485
communications (via pins 1, 2, 7, and 8). Note that the pins assigned to the powe
r
supply must not be connected when connecting the inverter with another device.

2-4
2.1.2 Specification of the terminal for RS-485 communications
・RS-485 communications card for FRENIC-Eco (option)
FRENIC-Eco/Multi's RS-485 communications card is equipped with two pairs of terminals for
multidrop. The terminal symbols, terminal names, and functions of the respective terminals are
as shown in the table below.
Terminal symbol Terminal name Function description
DX+ RS-485 communications data
(+) terminal
This is the (+) terminal of RS-485
communications data.
DX−RS-485 communications data
(-) terminal
This is the (−) terminal of RS-485
communications data.
1
SD
Communications cable shield
terminal
This is the terminal for relaying the shield of
the shielded cable, insulated from other
circuits.
DX+ DX+ relay terminal for
multidrop
This is the relay terminal of RS-485
communications data (+).
DX−DX- relay terminal for
multidrop
This is the relay terminal of RS-485
communications data (-).
2
SD
SD relay terminal for
multidrop
This is the terminal for relaying the shield of
the shielded cable, insulated from other
circuits.
Internal switch Terminating resistor switching A terminating resistor of 112is
incorporated. Connection/release is switched
by this switch*1.
*1 For the details of the switch, see "2.2.2 Cautions [2] About terminating resistors."
・FRENIC-MEGA
The terminal for RS-485 communications port 2 is provided in the control circuit terminals of the
inverter. The table below shows the code, name, and function of each terminal. These terminals
can be easily connected with the multi-drop circuit.
Terminal
symbol Terminal name Function description
DX+ RS-485 communications
data (+) terminal
This is the relay terminal of RS-485 communications
data (+).
DX- RS-485 communications
data (-) terminal
This is the relay terminal of RS-485 communications
data (-).
SD Communications cable shield
terminal
This is the terminal for relaying the shield of the
shielded cable, insulated from other circuits.
Internal switch Terminating resistor
switching
A terminating resistor of 112is incorporated.
Connection/release is switched by this switch*1.
*1 For the details of the switch, see "2.2.2 Cautions [2] About terminating resistors."

2.1 Specifications
2-5
Chap. 2 COMMON SPECIFICATIONS
2.1.3 RJ-45 connector (modular jack) for function expansion
RS-485 communications card for FRENIC-Multi (option)
Two RJ-45 connectors for function expansion are provided for connection with the multi-drop
circuit. The terminal symbol, terminal name, and functions are shown in the table below. The
connector for standard equipment and that for a relay have the same specifications without any
distinction.
Pin No. Signal name Description Remarks
1, 6, 7, 8 NC Unused −
2 SD
Communications cable shielded
terminal
Terminal for relaying the shield
of the shielded cable. The 2nd
terminals of the two RJ-45
connectors are internally
connected with each other.
3 −
Unused
The 3rd terminals of the two
RJ-45 connectors are
internally connected with each
other.
4 DX- RS-485 communications data (-)
terminal
Negative terminal for RS-485
communications data
5 DX+
RS-485 communications data (+)
terminal
Positive terminal for RS-485
communications data
The RJ-45 connector for function expansion differs in terminal functions from the
RJ-45 connected with the keypad built in the inverter.
* For details regarding terminator insertion switch (insertion SW), see "2.2.2 Cautions [2] About
terminating resistors."