RKC INSTRUMENT CD101 User manual

IMCD06-E2
Digital Controller
CD101/CD401
CD501/CD701
CD901
Communication
Instruction Manual
RKC INSTRUMENT INC.
®

All Rights Reserved, Copyright 1998, RKC INSTRUMENT INC.
CAUTIONS
 This manual is subject to change without prior notice.
 Examples of figures, diagrams and numeric values used in this manual are only for a better
understanding of the text, but not for assuring the result of operation.
 This manual may not be reproduced or copied in whole or in part without RKC's prior written consent.
 This instrument and manual are manufactured, prepared, then shipped under strict quality control.
However, if any defect is found, please contact your nearest RKC sales office or agent from which you
bought the system.
 RKC assumes no responsibility for any of the following damage which the user or third party may
suffer.
(1) Damage incurred as a result of using this instrument.
(2) Damage caused by the failure of the instrument, which cannot be predicted by RKC.
(3) Other indirect damage.

IMCD06-E2 i - 1
INTRODUCTION
Before using this instrument, please carefully read this manual for its correct use. In addition, after
reading the manual keep it available easily anytime.
USERS OF THIS MANUAL
This manual is prepared for all personnel who use CD101/CD401/CD501/CD701/CD901. However,
it is desirable that they have a fundamental knowledge of electrical engineering, process control and
communication.
WIRING PRECAUTIONS
• If failure or error of this instrument could result in a critical accident of the system,
install an external protection circuit to prevent such an accident.
• In order to prevent instrument damage or failure, protect the power line and the
input/output lines from high currents by using fuses with appropriate ratings.
POWER SUPPLY
• In order to prevent instrument damage or failure, supply power of the specified
rating.
• In order to prevent electric shock or instrument failure, do not turn on the power
supply until all of the wiring is completed.
INSTALLATION ENVIRONMENT
• In order to prevent fire, explosion or instrument damage, never use this instrument
at a location where flammable or explosive gases or vapor exist.
• This is a Class A instrument. In a domestic environment this instrument may cause
radio interference, in which case the user is required to take adequate measures.
NEVER TOUCH THE INSIDE OF THE INSTRUMENT
In order to prevent electric shock or burns, never touch the inside of the instrument.
Only RKC service engineers can touch the inside of the instrument to check the circuit
or to replace parts. High voltage and high temperature sections inside the instrument
are extremely dangerous.
NEVER MODIFY THE INSTRUMENT.
In order to prevent accident or instrument failure, never modify the instrument.
MAINTENANCE
• In order to prevent electric shock, burns or instrument failure, only RKC service
engineers may replace parts.
• In order to use this instrument continuously and safely, conduct periodic
maintenance. Some parts used in this instrument have a limited service life and may
deteriorate over time.
WARNING
!

IMCD06-E2
i - 2
INSTRUMENT SAFETY CAUTIONS
 This instrument is designed to be mounted on instrumentation panels. It is therefore manufactured
as part of the final product to facilitate wiring. This means that unauthorized personnel can easily
access the high-voltage sections in this instrument such as power terminals, etc. Therefore, when
this instrument is installed on the final product, the user should take the necessary measures for the
final product to ensure that unauthorized personnel cannot access the high-voltage sections, etc.
 In order to use this instrument correctly and safely, always observe the cautions described in this
manual when performing operations and maintenance. RKC assumes no responsibility for any
injury or accident resulting from not following these cautions.
NOTES ON INDICATIONS
The following indications are used in this manual to ensure the safe, correct use of the
CD101/CD401/CD501/CD701/CD901.
SIGNAL WORDS
SYMBOL MARKS
CAUTIONS PRIOR TO USE
 This instrument is intended to be used under the following environmental conditions. (IEC1010)
[OVERVOLTAGE CATEGORY II, POLLUTION DEGREE 2]
 To the instrument with power supply of 24 V, please be sure to supply the power from SELV
circuit.
 Before cleaning the instrument, check that the power is turned off.
 Remove stains on the display unit using a soft cloth or tissue paper.
 As the display unit is easily scratched, do not scrub or touch it with a hard object.
 The stains on the housing shall be wiped off by the cloth which is dipped into the neutral cleanser
diluted by water and wrung tightly, and finish it by a dried cloth.
 This instrument is protected from electric shock by reinforced insulation. So please arrange
reinforced insulation to the wire for input signal against the wires for instrument power supply,
source of power and loads as far as possible.
CAUTION
: Where there are possible dangers such as electric shock, fire (burns), etc. which
could cause loss of life or injury, precautions to avoid such dangers are
described.
: These describe precautions to be taken in case unit damage may result i
f
operating procedures are not strictly followed.
:Extra noted or precautions are added to operating procedures and explanations.
: This mark is used when great care is needed especially for safety.
: This mark is used to add extra notes, precautions or supplementary
explanations to table and figures.
WARNING
NOTE
!
∗
∗∗
∗

IMCD06-E2 i - 3
Name and number of this instruction manual :
Name : Digital Controller CD101/CD401/CD501/CD701/CD901
Communication Instruction Manual
Manual number : IMCD06-E2


Revisions
Date of revision Manual number Reason for revision
October 27, 1998 IMCD06-E1 The first edition issue
July 7, 1999 IMCD06-E2 Addition of controller types.

IMCD06-E2
i - 4
CONTENTS
Page
1. SPECIFICATIONS ................................................................ 1
2. WIRING ................................................................................. 2
3. SETTING FOR COMMUNICATION ...................................... 4
3.1 Transfer to communication setting mode ........................................................4
3.2 Communication parameter selection...............................................................5
3.3 Device address setting ....................................................................................6
3.4 Communication speed setting .........................................................................8
3.5 Data construction setting...............................................................................10
3.6 Interval time setting .......................................................................................12
3.7 Notes under communication..........................................................................15
4. COMMUNICATION PROTOCOL ........................................ 18
4.1 Polling............................................................................................................18
4.1.1 Polling procedure .............................................................................................19
4.1.2 Polling procedure example (When the host computer requests data) ..............22
4.2 Selecting........................................................................................................23
4.2.1 Selecting procedure .........................................................................................23
4.2.2 Selecting procedure example (When the host computer sends a set value) ....26
5. COMMUNICATION IDENTIFIER ........................................ 27
6. TROUBLESHOOTING ........................................................ 31
7. ASCII 7-BIT CODE TABLE (Reference) ............................ 32

IMCD06-E2 1
1. SPECIFICATIONS
Interface: Based on EIA standard RS-485
Connection method: 2-wire system, half-duplex multidrop connection
Communication distance: 1 km (max.)
* However, the maximum communication distance varies slightly
with the surroundings such as cables etc.
Synchronous method: Start/stop synchronous type
Communication speed: 2400 bps, 4800 bps, 9600 bps, 19200 bps
Data type: Start bit: 1
Data bit: 7 or 8
Parity bit: Unused or Used (Odd number or even number)
Stop bit: 1 or 2
Protocol: ANSI X3.28 subcategory 2.5, A4
Polling/selecting type
Error control: Vertical parity (With parity bit selected)
Horizontal parity (BCC check)
Maximum connection: 32 sets including a host computer
Communication code: ASCII 7-bit code
Termination resister: 100 Ωor more (Externally connected)
Xon/Xoff control: None
Signal logic:
Signal voltage Logic
V (A) > V (B) 0 (Space status)
V (A) < V (B) 1 (Mark status)

2
IMCD06-E2
2. WIRING
Up to 32 CD101/CD401/CD501/CD701/CD901 digital controller (hereinafter, the "controller")
including the host computer can be connected if multidrop connected by RS-485.
 Terminal No. and signal details
CD101/CD401/CD501/CD901
Terminal No. Signal name Name
Signal direction
Controller Host computer
13 SG Signal ground
14 T/R(A) Send data/Receive data
15 T/R(B) Send data/Receive data
CD701
Terminal No. Signal name Name
Signal direction
Controller Host computer
7 SG Signal ground
8 T/R(A) Send data/Receive data
9 T/R(B) Send data/Receive data
In order to prevent electric shock or instrument failure, do not turn on the power
until all the wiring is finished.
WARNING
!

2. WIRING
IMCD06-E2 3
 When host computer interface is RS-485
It is necessary that a circuit to transfer send and receive be built-in the host computer.
SG
T/R
(
B
)
T/R
(
A
)
SG
T/R
(
B
)
T/R
(
A
)
RD
(
RXD
)
: Receive
SD
(
TXD
)
: Send data
Host com
p
uter
RS-485
SG
T/R
(
B
)
T/R
(
A
)



Up to 31
Paired wire
Send/receive
selection signal
Twisted pair wire
(with shield)
*R: Use a terminal resistor with a combined resistance of more than 100 Ω.
*R
Controller
Controller
SD (TXD) and RD (RXD) : Negative logic
 When host computer interface is RS-232C
Communication level converter (RS-232C/RS-485) is used.
Controller
SG
T/R(B)
T/R(A)
RS-485
SG
T/R(A)
T/R(B)
RS-232C
Host computer
Communication level
converter
Twisted pair wire
(with shield)
Paired wire
*R: Use a terminal resistor with a combined resistance of more than 100 Ω.
*R
When the host computer is for Windows 95/NT, use a communication level converter of
the automatic send/receive select type.
Recommended: CD485, CD485/V manufactured by Data Link, Inc. or equivalent.
CAUTION

2. WIRING
IMCD06-E2
4
 Connection example
(When up to 32 controllers including host computer are connected)
For details of the communication level converter and junction branch box BRA-100B-2, see each
Instruction Manual.
Host computer
Host computer
Communication level converter
BRA-100B-2
BRA-100B-2 BRA-100B-2
2928 30
NOTE
0 1 2 3
ControllerControllerController
Device address
example
RS-485
or
RS-232C
RS-485
RS-485

IMCD06-E2 5
3. SETTING FOR COMMUNICATION
In order to make communication between the CD101/CD401/CD501/CD701/CD901 digital
controller (hereinafter, the "controller") and the host computer, it is necessary to set the device
address, communication speed, data construction and interval time. Communication settings are made
in communication setting mode.
The following pictures used for explanation are for CD901. However, the same operation also applies
to other controllers. The section in each picture is dimly lit.
3.1 Transfer to communication setting mode
1. Turn on the power to this controller. Thus, the input type, input range and PV/SV display mode
change in this order.
2. Pressing the <R/S key while the SET key is being pressed when PV/SV display mode is being
displayed selects communication setting mode. In this mode, device address "Add" are displayed
in the first place.
PV
SV
AT OUT1 OUT2 ALM1 ALM2
R/S
CD901
C
SET
PV
SV
AT OUT1 OUT2 ALM1 ALM2
R/S
CD901
C
SET
 The communication setting mode can be selected anytime when the SV setting mode.
 In order to terminate the communication setting mode, press the <R/S key while pressing the
SET key. After the communication setting mode terminates, the display changes to the PV/SV
display mode.
NOTES
Device address
Communication setting modePV/SV display mode

3. SETTING FOR COMMUNICATION
IMCD06-E2
6
3.2 Communication parameter selection
Parameters in communication setting mode are selected in the order of device address "Add,"
communication speed "bPS," data construction "bIT" and interval time set value "InT."
Each parameter is selected by pressing the SET key.
 Display flowchart
Input type and input range
display
Power ON (Display for approx. 4 sec)
Display changes automatically
PV/SV display mode
Pressing the <R/S key while the SET key.
Device address
(add)
Communication speed
(bPS)
Data construction
(bIT)
Interval time set value
(InT)
Press the
SET key.
Press the <R/S key
while pressing the
SET key.
Press the SET key.
Press the SET key.
Press the
SET key.
Press the SET key.
Communication setting mode
SV setting mode
PV/SV display
mode
SV

PV

SV

PV

SV

PV

SV

PV


3. SETTING FOR COMMUNICATION
IMCD06-E2 7
3.3 Device address setting
Set the device address by using numerals from 0 to 99. Press the UP or DOWN key to change the
numeral, and also press the <R/S key to shift the digit.
Symbol Name Setting range Description Factory set
value
Device address 0 to 99 Sets the controller device
address.
0
Add
 When the communication parameter was changed, always turn on the power again.
Otherwise, no communication is performed by using the changed value.
 If key operation is not performed for more than 1 minute without pressing the SET key
after the device address is set, the controller is automatically changed to PV/SV display
mode. In this case, the set device address returns to the value before the setting is
changed.
 Setting procedure
Example: When setting device address to 15.
1. Change the controller to communication setting mode, and then display the device address
(See P. 5, 6).
PV
SV
AT OUT1 OUT2 ALM1 ALM2
R/S
CD901
C
SET
CAUTIONS
Device address

3. SETTING FOR COMMUNICATION
IMCD06-E2
8
2. Set the device address. Press the UP key to enter "5" in the lowest digit.
PV
SV
AT OUT1 OUT2 ALM1 ALM2
R/S
CD901
C
SET
3. Press the <R/S key to brightly light the tens digit.
PV
SV
AT OUT1 OUT2 ALM1 ALM2
R/S
CD901
C
SET
4. Press the UP key to enter "1" in the tens digit.
PV
SV
AT OUT1 OUT2 ALM1 ALM2
R/S
CD901
C
SET
5. Press the SET key to select the next communication parameter. As a result, the set device
address is registered.

3. SETTING FOR COMMUNICATION
IMCD06-E2 9
3.4 Communication speed setting
Set a communication speed of 2400 bps, 4800 bps, 9600 bps or 19200 bps by using numerals from 0
to 3. Press the UP or DOWN key to change the numeral.
Symbol Name Setting range Description Factory set
value
Communication
speed
0 : 2400 bps
1 : 4800 bps
2 : 9600 bps
Selects the communication
speed.
2
bPS 3 : 19200 bps
 Set the same communication speed to both the controller and connecting host
computer.
 When the communication parameter was changed, always turn on the power again.
Otherwise, no communication is performed by using the changed value.
 If key operation is not performed for more than 1 minute without pressing the SET key
after the device address is set, the controller is automatically changed to PV/SV display
mode. In this case, the set communication speed returns to the value before the setting
is changed.
 Setting procedure
Example: When setting communication speed to "1: 4800 bps."
1. Change the controller to communication setting mode, and then display the communication
speed (See P. 5, 6).
Communication speed
PV
SV
AT OUT1 OUT2 ALM1 ALM2
R/S
CD901
C
SET
CAUTIONS

3. SETTING FOR COMMUNICATION
IMCD06-E2
10
2. Press the DOWN key to enter "1" in the lowest digit. As a result, a communication speed of
4800 bps is set.
PV
SV
AT OUT1 OUT2 ALM1 ALM2
R/S
CD901
C
SET
3. Press the SET key to change to the next communication parameter. As a result, the set
communication speed is registered.

3. SETTING FOR COMMUNICATION
IMCD06-E2 11
3.5 Data construction setting
Set the data bit construction during communication by using numerals from 0 to 5. Press the UP or
DOWN key to change the numeral.
Symbol Name Setting range Description Factory set
value
Data construction 0 to 5
See *A
Selects data construction
during communication.
0
bIT
*A
Setting Data bit [bit] Parity bit Stop bit [bit]
0 8 None 1
1 8 None 2
2 7 Even 1
3 7 Even 2
4 7 Odd 1
5 7 Odd 2
 Set the same data construction to both the controller and connecting host computer.
 When the communication parameter was changed, always turn on the power again.
Otherwise, no communication is performed by using the changed value.
 If key operation is not performed for more than 1 minute without pressing the SET key
after the device address is set, the controller is automatically changed to PV/SV display
mode. In this case, the set data construction returns to the value before the setting is
changed.
CAUTIONS

3. SETTING FOR COMMUNICATION
IMCD06-E2
12
 Setting procedure
Example: When setting data construction to "1: 8 data bits, no parity bit and 2 stop bits."
1. Change the controller to communication setting mode, and then display the data construction
(See P. 5, 6).
PV
SV
AT OUT1 OUT2 ALM1 ALM2
R/S
CD901
C
SET
2. Press the UP key to enter "1" in the lowest digit. As a result, data construction is set to "8 data
bits, no parity bit and 2 stop bits."
PV
SV
AT OUT1 OUT2 ALM1 ALM2
R/S
CD901
C
SET
3. Press the SET key to change to the next communication parameter. As a result, the set data
construction is registered.
Data construction

3. SETTING FOR COMMUNICATION
IMCD06-E2 13
3.6 Interval time setting
Set the interval time. Press the UP or DOWN key to change the numeral, and press the <R/S key to
shift the digit.
Symbol Name Setting range Description Factory set
value
Interval time set
value
0 to 150
*A
Sets the value to set the
interval time.
5
InT
*A: Can be set up to 250 ms if converted to interval time.
Equations for calculating interval time and interval time set value
Equations :
Interval time = Interval time set value ×1.666 ms
Interval time set value = Interval time ÷1.666 ms
 When the communication parameter was changed, always turn on the power again.
Otherwise, no communication is performed by using the changed value.
 If key operation is not performed for more than 1 minute without pressing the SET key
after the device address is set, the controller is automatically changed to PV/SV display
mode. In this case, the set interval time set value returns to the value before the setting
is changed.
 Setting procedure
Example: When setting interval time to 250 ms.
1. Change the controller to communication setting mode, and then display the interval time set
value (See P. 5, 6).
PV
SV
AT OUT1 OUT2 ALM1 ALM2
R/S
CD901
C
SET
CAUTIONS
Interval time set value

3. SETTING FOR COMMUNICATION
IMCD06-E2
14
2. Here, as an interval time of 250 ms needs to be set, calculate the interval time set value using the
equation (See P. 13).
Interval time set value:
250 ms ÷1.666 ms 150 (Round to the nearest whole number.)
Interval time:
150 ×1.666 ms 249.9 (Approx. 250 ms)
Thus, enter an interval time set value of 150 calculated from the above by pressing the UP or
DOWN key at the front of the controller.
3. Press the DOWN key to enter "0" in the lowest digit.
PV
SV
AT OUT1 OUT2 ALM1 ALM2
R/S
CD901
C
SET
4. Press the <R/S key to brightly light the tens digit.
PV
SV
AT OUT1 OUT2 ALM1 ALM2
R/S
CD901
C
SET