Shimaden SR23 series User manual

SR23 Series
Digital Controller
Instruction Manual
Communication Interface (RS-232C/RS-485)
Thank you for purchasing the Shimaden SR23 Series Digital
Controller.
Check that the delivered product is the correct item you ordered.
Do not begin operating this product until you have read and
thoroughly underst
oo
d
the
contents
of
this
I
nstruction
M
anual
.
MSR23-E04-
A
August 2005

i
Request
Make sure that this instruction manual is given to the final user of the device.
Keep this manual at the work site during operation of the SR23 Series.
Preface
This Instruction Manual describes the basic functions and method of use of the
“Communications Interface (RS-232C/RS-485)” for the SR23 Series Programmable
Controller.
For an outline description of this controller and details of its incorporated functions, and
details on wiring, installation, operation and routine maintenance of the SR23 Series,
refer to the separate document “SR23 Series Digital Controller, Instruction Manual”
(simply called "Instruction Manual" from here on).
Safety Precautions
Warning
The SR23 Series Programmable Controller is designed for controlling
temperature, humidity and other physical quantities in general industrial
facilities.
It must not be used in any way that may adversely affect the safety,
health or working conditions of those who come into contact with the
effects of its use.
When used, adequate and effective safety countermeasures must be
provided at all times by the user. No warranty, express or implied, is valid
when this device is used without the proper safety countermeasures.
Warning
●Before you start to use this device, install it in a control panel or the
like and avoid touching the terminals.
●Do not open this device’s case, and touch the boards or inside of the
case with your hands or a conductor.
The user should never repair or modify this device.
Doing so might cause an accident that may result in death or serious
bodily injury from electric shock.

ii
Caution
To avoid damage to connected peripheral devices, facilities or the
product itself due to malfunction of this device, safety countermeasures
such as proper installation of the fuse or installation of overheating
protection must be taken before use. No warranty, express or implied, is
valid in the case of use resulting in an accident without having taken the
proper safety countermeasures.

iii
Contents
Contents .................................................................................................. iii
1OUTLINE.............................................................................................1
1-1 Communication Interface...............................................................................1
1-2 Communication Protocol and Specifications..................................................1
2CONNECTING THE CONTROLLER TO A HOST COMPUTER ........3
2-1 When the RS-232C Interface Is Used............................................................3
2-2 When the RS-485 Interface Is Used ..............................................................3
3COMMUNICATION SETUP PARAMETERS ......................................5
3-1 Setting the Communication Mode (No.1-2)....................................................5
3-2 Setting the Communication Protocol (No.5-8)................................................6
3-3 Setting the Device Address (No.5-8) .............................................................6
3-4 Setting the Communication Speed (No.5-8) ..................................................7
3-5 Setting the Communication Memory Mode (No.5-8)......................................7
3-6 Setting the Communication Data Length (No.5-9) .........................................7
3-7 Setting the Communication Parity (No.5-9)....................................................8
3-8 Setting the Communication Stop Bit (No.5-9) ................................................8
3-9 Setting the Communication Delay Time (No.5-9)...........................................8
3-10 Setting the Communication Control Code (No.5-10)......................................8
3-11 Setting the Communication BCC Data Operation Method (No.5-10) .............9
4EXPLANATION OF SHIMADEN PROTOCOL..................................11
4-1 Communication Procedure ..........................................................................11
(1) Master and slave..................................................................................................... 11
(2) Communication procedure...................................................................................... 11
(3) Timeout................................................................................................................... 11
4-2 Communication Format ...............................................................................11
(1) Outline of communication format ............................................................................ 12
(2) Details of basic format section I.............................................................................. 13
(3) Details of basic format section II............................................................................. 13
(4) Outline of text section ............................................................................................. 16

iv
4-3 Details of Read Command (R)..................................................................... 18
(1) Format of Read command (R)................................................................................. 18
(2) Format of normal response to Read command (R).................................................18
(3) Format of error response to Read command (R) .................................................... 20
4-4 Details of Write Command (W) .................................................................... 20
(1) Format of Write command (W) ................................................................................ 21
(2) Format of normal response to Write command (W) ................................................ 22
(3) Format of error response to Write command (W).................................................... 23
4-5 Details of Broadcast Command (B) ............................................................. 23
(1) Format of broadcast command ............................................................................... 23
4-6 Details of Response Codes ......................................................................... 24
(1) Type of response codes .......................................................................................... 24
(2) Order of priority of response codes ......................................................................... 24
5EXPLANATION OF MODBUS COMMUNICATION PROTOCOL .....25
5-1 Outline of Transfer Mode ............................................................................. 25
(1) ASCII mode ............................................................................................................. 25
(2) RTU mode ............................................................................................................... 25
5-2 Configuration of Messages .......................................................................... 25
(1) ASCII mode ............................................................................................................. 25
(2) RTU mode ............................................................................................................... 26
5-3 Slave Address ............................................................................................. 26
5-4 Function Codes ........................................................................................... 26
5-5 Data............................................................................................................. 27
5-6 Error Check ................................................................................................. 27
(1) ASCII mode ............................................................................................................. 27
(2) RTU mode ............................................................................................................... 27
5-7 Examples of Messages................................................................................ 28
(1) ASCII mode ............................................................................................................. 28
(2) RTU mode ............................................................................................................... 30
6 LIST OF COMMUNICATION DATA ADDRESSES...........................33
6-1 Outline of Communication Data Address..................................................... 33
(1) Data address and reading/writing the data address................................................ 33
(2) Reading/writing parameters in a 2-loop specification.............................................. 33
(3) Reading/writing “reserved” in the parameter section............................................... 33
(4) Reading/writing option-related parameters ............................................................. 33
(5) Parameters not displayed on the front panel........................................................... 33
(6) Handling data .......................................................................................................... 34
(7) Execution of broadcast............................................................................................ 34
(8) Annotation of time data ...........................................................................................34
6-2 Communication Data Address ..................................................................... 35

v
7APPENDIX........................................................................................55
7-1 Setting Range Code Table...........................................................................55
7-2 ASCII Code Table........................................................................................57

vi
This page left intentionally blank

1 OUTLINE 1
1 OUTLINE
1-1 Communication Interface
As an option, the SR23 Series supports two communication interfaces: RS-2323C and
RS-485. Using these communication interfaces, you can set up or read various data
from a personal computer.
The RS-2323C and RS-485 communication interface are data communication standards
determined by the EIA (Electronic Industries Alliance) of the United States. These
standards stipulate electrical and mechanical so-called “hardware” information, and do
not define the software aspects of data transfer procedures. For this reason,
communication is not possible unconditionally even between devices that support the
same interface.
For this reason, the user must be fully familiar with and understand data transfer
specifications and transfer procedures.
The RS-485 interface allows multiple SR23s to be connected in parallel.
Though there are currently few personal computers that support the RS-485 interface,
the RS-485 interface can be used by connecting a third-party RS-232C/RS-485
converter.
1-2 Communication Protocol and Specifications
The SR23 Series supports the SHIMADEN standard protocol and MODBUS
communication protocol.
Common to each protocol
Signal level EIA RS-232C, RS-485 compliant
Communication system RS-232C 3-line half-duplex system
RS-485 2-line half-duplex multidrop (bus) system
Synchronization system Start-stop synchronization
Communication distance RS-232C max. 15ｍ
RS-485 max. 500 m (depending on connection conditions)
Communication speed 2400/4800/9600/19200 bps
Transmission procedure Non-procedural
Communication delay time 1 to 50 ms
Communication code ASCII code
Number of connectable
device
RS-232C 1
RS-485 max. 31 (depending on connection conditions)

2 1 OUTLINE
SHIMADEN standard protocol
This is a SHIMADEN proprietary communication protocol.
The table below shows the specifications of this protocol.
Data length 7/8 bits
Parity EVEN, ODD, NONE
Stop bit 1/2 bits
Communication address 01 to 98
Communication memory mode EEP/RAM/R_E
Communication BBC Add/Add two’s cmp/XOR/NONE
MODBUS communication protocol
This is a communication protocol developed for PLCs by Modicon Inc.
Though the specifications of this protocol are open, only the communication protocol is
defined in this protocol, and physical layers such as communication medium are not
stipulated.
The table below shows the specifications of this protocol.
• ASCII mode
Data length Fixed to 7 bits
Parity EVEN, ODD, NONE
Stop bit 1 bit, 2 bits
Control code _CRLF
Error check LRC
• RTU mode
Data length Fixed to 8 bits
Parity EVEN, ODD, NONE
Stop bit 1 bit, 2 bits
Control code None
Error check CRC
Function code 03H) Read data
06H) Write data

2 CONNECTING THE CONTROLLER TO A HOST COMPUTER 3
2 CONNECTING THE CONTROLLER
TO A HOST COMPUTER
The SR23 Series controller is connected to the host computer by three lines, send data,
receive data and signal ground.
The following shows connection examples.
For details, refer to the User’s Manual for the host computer.
2-1 When the RS-232C Interface Is Used
SR23
Controller
SD(3) RD(14) ...Receivedata
...Senddata
...Signalground
RD(2) SD(13)
SG(5) SG(12)
RS(7)
CS(8)
DR(6)
ER( 4 )
Host (9-pin)
PC/ATcompatible
machine
Numbers in parentheses () are connector pin Nos.
2-2 When the RS-485 Interface Is Used
The I/O logic level of the F23 basically is as follows:
Mark state: - terminal < + terminal Space state: - terminal > + terminal
Note, however, that the + terminal, and – terminal of the controller are high-impedance
before transmission is started, and the above levels are output during transmission.
If necessary, attach a terminator of about 1/2W 120Ωto the endmost terminal (between
+ and – terminals). Operation when a terminator attached to two or more units is not
guaranteed.

4 2 CONNECTING THE CONTROLLER TO A HOST COMPUTER
Host SR23
FG Controller
１
+＋(13)
-－(14)
SG SG(12)
２
＋(13)
－(14)
SG(12)
.
.
Ｎ
＋(13)
－(14)
SG(12)
Terminator
(120 Ω)
Controller
Controller
About tri-state output control
When the RS-485 interface is used, the connection becomes a multidrop connection.
For this reason, to avoid conflict between send signals, the transmission output is held at
high-impedance at all times during reception or when communication is not performed.
In tri-state control, a delay of about 1 msec (max.) after end of transmission of the end bit
of the end character up to the return from high impedance is generated.
To absorb this delay time, be sure to set a delay time of several seconds or more when
performing transmission immediately after the host computer ends reception.
end bit
start bit
Send signal
END CHARACTER
end bit
High-impedance
END CHARACTER
1
0
High-impedance

3 COMMUNICATION SETUP PARAMETERS 5
3 COMMUNICATION SETUP PARAMETERS
The SR23 Series has 11 communication setup parameters, of which two are exclusively
for the SHIMADEN standard protocol.
• Setting the communication mode (No.1-1)
• Setting the communication protocol (No.5-8)
• Setting the device address (No.5-8)
• Setting the communication speed (No.5-8)
• Setting the communication memory mode (No.5-8)
• Setting the communication data length (No.5-9)
• Setting the communication parity (No.5-9)
• Setting the communication stop bit (No.5-9)
• Setting the communication delay time (No.5-9)
• Setting the communication control code (No.5-10): SHIMADEN standard protocol only
• Setting the BCC data operation method (No.5-10): SHIMADEN standard protocol only
These parameters can be set or changed only by using the keys on the front panel and
not by communication.
When setting these parameters, refer to the “LCD Flow Chart” in the Instruction Manual
and follow the instructions in this section.
3-1 Setting the Communication Mode (No.1-1)
1-1
Setting range : LOC, COM
Default : LOC
Set the communication mode.
Note, however, that COM can be only changed to LOC using the front panel keys.
LOC Only read command enabled by communication (COM LED on front panel
out)
COM Read and write commands enabled by communication (COM LED on front
panel lit)
Note
When the communication mode is set to COM, changing of all communication
setup parameters is prevented by the key lock.
To prevent uncontrollable situations such as host program runaway,
communication between the SR23 and the host can be forcibly terminated by
holding down the ENT and STEP keys simultaneously for at least three seconds.
COM:
AT : OFF
MAN: OFF
CH
１
COM

6 3 COMMUNICATION SETUP PARAMETERS
3-2 Setting the Communication Protocol (No.5-8)
5-8
Setting range : SHIMADEN, MOD_ASC, MOD_RTU
Default : SHIMADEN
Set the communication protocol.
SHIMADEN SHIMADEN standard protocol
MOD_ASC MODBUS communication protocol (ASCII mode)
MOD_RTU MODBUS communication protocol (RTU mode)
There are two MODBUS communication protocol modes, ASCII mode and RTU mode.
Either of these modes can be selected. Note, however, that all devices on the same
network must be set to the same MODBUS communication protocol mode.
In the ASCII mode, 1-byte (8-bit) data is converted to two ASCII code characters before
it is transferred.
In the RTU mode, 1-byte (8-bit) data is transferred as it is.
For this reason, it can be said that the transfer efficiency of the RTU mode is better than
that of the ASCII mode.
3-3 Setting the Device Address (No.5-8)
5-8
Setting range : 1 to 98
Default : 1
In the case of the RS-232C interface, the connection between the SR23 and the host
computer is a 1:1 connection. However, in the case of the RS-485 interface, the
connection becomes a multidrop connection, which means that a maximum of 31 SR23
units can be connected.
However, actual communication must be performed by a 1:1 connection. For this reason,
unique addresses (machine Nos.) are provided for each of the devices.
Addresses are set within the range 01 to 98, and addresses can be set to a maximum of
31 machines.
The preset address is used as the address for infrared communication with the front
panel of the device.
For details, refer to the Instruction Manual for the Parameter Setup Tool (sold separately).
COM PROT: SHIMADEN
ADDR: 1
BPS : 9600
MEM : EEP
COM PROT: SHIMADEN
ADDR: 1
BPS : 9600
MEM : EEP

3 COMMUNICATION SETUP PARAMETERS 7
3-4 Setting the Communication Speed (No.5-8)
5-8
Setting range : 2400/4800/9600/19200 bps
Default : 9600 bps
Select from 2400, 4800, 9600, 19200 bps as the communication speed, and set.
3-5 Setting the Communication Memory Mode (No.5-8)
5-8
Setting range : EEP/RAM/R_E
Default : EEP
This device uses non-volatile memory (EEPROM) for storing parameter setups.
As the write cycle or number of times that the EEPROM can be written is already
determined, periodically rewriting SV data, for example, in EEPROM by communication
will shorten the EEPROM’s life.
To prevent this when data is frequently rewritten by communication, the EEPROM can
also be set so that it is not rewritten and only RAM data is overwritten. This will prolong
the life of the EEPROM.
EEP In this mode, the EEPROM is rewritten each time that data is changed by
communication. For this reason, data is held on the device even if the device
is turned OFF.
RAM In this mode, only RAM data is rewritten and data in EEPROM is not rewritten
even if data is changed by communication. For this reason, data in RAM is
cleared when the device is turned OFF, and the device starts up with the data
in EEPROM when it is turned ON again.
R_E In this mode, SV1 to SV10, OUT, and COM mode data is written only to RAM.
Other data is written to EEPROM.
3-6 Setting the Communication Data Length (No.5-9)
5-9
7 or 8 bits can be set only in the SHIMADEN standard protocol. The default data length
is 7 bits.
The data length in the MODBUS communication protocol is fixed to 7 bits in the ASCII
mode and 8 bits in the RTU mode.
COM PROT: SHIMADEN
ADDR: 1
BPS : 9600
MEM : EEP
COM PROT: SHIMADEN
ADDR: 1
BPS : 9600
MEM : EEP
COM DATA: 7
PARI: EVEN
STOP: 1
DELY: 10 ms

8 3 COMMUNICATION SETUP PARAMETERS
3-7 Setting the Communication Parity (No.5-9)
5-9
Setting range : EVEN, ODD, NONE
Default : EVEN
Set the parity check method for detecting errors in data in data communication.
3-8 Setting the Communication Stop Bit (No.5-9)
5-9
Setting range : 1, 2
Default : 1
3-9 Setting the Communication Delay Time (No.5-9)
5-9
Setting range : 1 to 50 ms
Default : 10 ms
Set the minimum delay time from reception of the communication command up to
transmission.
Note
• In the case of the RS-485 interface, it sometimes takes time to perform tri-state
control due to the line converter, which may cause signals to collide. This can be
avoided at this time by lengthening the delay time. Particular care must be taken
when communication is set to a low speed (2400 bps).
• The actual delay time from reception of the communication command up to
transmission is the total time required to process commands by the software
added to the above delay time. In particular, it sometimes takes about 400 ms to
process commands in the case of the write command.
3-10 Setting the Communication Control Code (No.5-10)
This setting item is available only in the SHIMADEN standard protocol. Set the
communication control code.
5-10
Setting range : STX_ETX_CR, STX_ETX_CRLF,
@_: _CR
Default : STX_ETX_CR
COM DATA: 7
PARI: EVEN
STOP: 1
DELY: 10 ms
COM DATA: 7
PARI: EVEN
STOP: 1
DELY: 10 ms
COM DATA: 7
PARI: EVEN
STOP: 1
DELY: 10 ms
COM CTRL STX_EXX_CR
BCC ： ADD

3 COMMUNICATION SETUP PARAMETERS 9
3-11 Setting the Communication BCC Data Operation Method
(No.5-10)
This setting item is available only in the SHIMADEN standard protocol.
5-10
Setting range : ADD, ADD_two's cmp, XOR, None
Default : ADD
COM CTRL : STX_ETX_CR
DD BCC ： A
There are four operation methods for the BCC (Block Check Character) data:
ADD Addition operation
ADD_two's cmp The two’s complement of the lower 1 byte of the addition operation
result is taken.
XOR XOR (exclusive OR) operation is performed.
None BCC operation is not performed.
For details, see “4-2 (3) Details of basic format section II.”

10 3 COMMUNICATION SETUP PARAMETERS
This page left intentionally blank

4 EXPLANATION OF SHIMADEN PROTOCOL 11
4 EXPLANATION OF SHIMADEN PROTOCOL
4-1 Communication Procedure
(1) Master and slave
The host (personal computer or PLC) is the master.
The SR23 is the slave.
Communication starts by the communication command from the master, and ends by
the communication response from the slave.
Note, however, that a communication response is not performed when an error (e.g.
communication format error or BCC error) occurs, or when a broadcast command is
issued.
(2) Communication procedure
Communication is performed by a response being returned by the slave to the master.
During communication, the transmission right shifts between the master and the slave.
(3) Timeout
The SR23 regards instances where reception of the end character does not end within
one second of receiving the start character as a timeout, disables that command, and
stands by for the next command (new start character).
4-2 Communication Format
The SR23 Series supports various protocols, and so various selections can be made by
the communication format (control codes, BCC operation method) or communication
data format (data bit length, parity, stop bit length).
However, for ease of use and to avoid confusion when setting up communications, we
recommend using the following format:
Recommended Format
Control code STX_ETX_CR
BCC operation method ADD
Data bit length 7 8
Parity EVEN NONE
Stop bit length 1 1

12 4 EXPLANATION OF SHIMADEN PROTOCOL
(1) Outline of communication format
The formats of the communications commands sent from the master and the
communication response formats sent from the slave comprise three blocks: basic
format section I, text section and basic format section II.
Basic format sections I and II are common to the Read command (R), Write command
(W) and during communication responses. Note, however, that the operation result data
at that time is inserted as the BCC data of i ((13) and (14)). The text section differs
according to factors such as the command type, data address and communication
response.
Communication command format
Text end
character
Basic format section I
Start
character
Command type
Subaddress
Device
address
Start
data address
Number
of data
Data
BCC
data
End
character
(delimiter)
Text section
ab cd e f g h i j
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15) (16)
STX 0 1 1 R 0 1 0 0 0 - - - - ETX D A CR - -
STX 0 2 1 W 0 1 8 C 0 ,* * * * ETX 0 B CR - -
Basic format section II
Communication response format
Command type
Start
character
a
Basic format section I
Text end
character
Device
address
Subaddress Response code
Data
BCC
data
End character
(delimiter)
bcde g hi j
(1) (2) (4) (5) (6) (11) (12) (13) (15)(3) (7) (14) (16)
STX 0 1 R 0 , * * * * ETX 3 CR10 E--
STX 0 1 W 0 - - - - ETX 4 CR20 F--
Text section Basic format section II