Oval EL4101 Use and care manual

Ins. No. E-880CM-1-E
1
FLOW COMPUTER EL4001 SERIES
COMMUNICATION MANUAL
Every OVAL Flow Computer is fabricated and shipped from our factory under stringent quality control.
To derive maximum benefit from the computer, we recommend that you become familiar with this
instruction manual before you place it in service and retain a copy at the field location for ready
reference.

E-880CM-1-E
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This manual has been prepared for OVAL flow computers of the EL4001 series. Making sure of your
model number and understanding well about the input/output and calculation process according to the
instruction manual for the model, and reference only the specific topic of interest.
In the EL4001 series, mode selection is simple with keystrokes on the front-panel keypad. However, we
recommend you to become thoroughly familiar with the procedure described in this manual before you
reconfigure parameters.
If you have something to inquire, contact the sales office from which you purchased the product, or the
nearest OVAL representative in our customer service network.
(When you inquire, please supply us with the product name, model No., serial No., and other pertinent
information.)
This communication manual applies to the following models:
・EL4101 Steam Service Flow Computer (saturated steam service)
・EL4111 Steam Service Flow Computer (superheated steam service)
・EL4121 Temperature/Pressure Compensation Flow Computer (gas service)
・EL4131 Liquid Temperature Compensation Flow Computer
・EL4201 Temperature/Pressure Compensation Flow Computer (measured in terms of mass)
・EL4211 Liquid Temperature Compensation Flow Computer (measured in terms of mass)
・EL4301 Density Computer for Mass Flowmeter
・EL4311 Density Computer for Mass Flowmeter (solids content flow compensated)
・EL4321 Density Computer (oscillating spool densitometer, gas service)
・EL4401 Blend Oil Temperature Compensation Flow Computer
・EL4501 Multipoint Temperature Compensation Flow Computer
・EL4511 Multipoint Temperature Compensation Flow Computer (with communication interface)
BEFORE YOU BEGIN

E-880CM-1-E
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1. COMMUNICATION CAPABILITY OVERVIEW........................................................................................ 5
2. NETWOWRK CONFIGURATION............................................................................................................ 5
2.1 About Write Protect ........................................................................................................................... 6
2.1.1 Write Protect with a Password.................................................................................................... 6
(1) Functions of Basic EL4001......................................................................................................... 6
(2) Functions in Communication Mode ............................................................................................ 6
(3) How to Reset a Password .......................................................................................................... 6
(4) Where unable to Reset a Password ........................................................................................... 6
2.1.2 Write Protect with DIP Switch..................................................................................................... 7
(1) Functions of Basic EL4001......................................................................................................... 7
(2) Functions in Communication Mode ............................................................................................ 7
3. LOCAL / REMOTE SELECTION ............................................................................................................. 8
3.1 Mode Select Map .............................................................................................................................. 9
4. SETUP ITEMS FOR COMMUNICATION .............................................................................................. 10
4.1 Setup Items ..................................................................................................................................... 10
4.2 Menu Trees ..................................................................................................................................... 10
5. COMMUNICATION PROCEDURE.........................................................................................................11
6. COMMUNICATION FORMAT................................................................................................................ 12
6.1 Command Format ........................................................................................................................... 12
6.2 Response Format............................................................................................................................ 12
6.3 Communication Commands............................................................................................................ 13
6.4 Units of Numerical Data in Data Communication............................................................................ 14
6.5 Numerical Data Format in Data Communication............................................................................. 14
6.6 Response Code .............................................................................................................................. 15
6.7 Procedure to Change Parameters in the SET Mode....................................................................... 16
6.8 RUN Mode Data Read Command (RR) .......................................................................................... 17
6.8.1 Description................................................................................................................................ 17
6.8.2 Command/Response................................................................................................................ 18
6.9 SET Mode Read Command (RS).................................................................................................... 20
6.9.1 Description................................................................................................................................ 20
6.9.2 Command/Response................................................................................................................ 23
6.10 SET Mode Write Command (WS) ................................................................................................. 24
6.10.1 Description.............................................................................................................................. 24
6.10.2 Command/Response.............................................................................................................. 24
6.11 SYS Mode Read Commands (RY)................................................................................................ 25
6.11.1 Description.............................................................................................................................. 25
6.11.2 Command/Response .............................................................................................................. 26
6.12 SYS Mode Write Commands (WY) ............................................................................................... 27
6.12.1 Description.............................................................................................................................. 27
6.12.2 Command/Response.............................................................................................................. 27
6.13 Error Status Read Commands (RE).............................................................................................. 28
6.13.1 Description.............................................................................................................................. 28
6.13. 2 Command/Response............................................................................................................. 29
6.14 Error Logging Read Command (RL) ............................................................................................. 30
6.14.1 Description.............................................................................................................................. 30
6.14.2 Command/Response.............................................................................................................. 30
TABLE OF CONTENTS

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6.15 Model Setup Information Read Command (RI)............................................................................. 32
6.15.1 Description.............................................................................................................................. 32
6.15.2 Command/Response.............................................................................................................. 32
6.16 Local/Remote Select Command (SM)........................................................................................... 33
6.16.1 Description.............................................................................................................................. 33
6.16.2 Command/Response.............................................................................................................. 33
6.17 Mode Select Command (MC)........................................................................................................ 34
6.17.1 Description.............................................................................................................................. 34
6.17.2 Command/Response.............................................................................................................. 34
6.18 Computer Status Read Command (RC) ....................................................................................... 36
6.18.1 Description.............................................................................................................................. 36
6.18.2 Command/Response.............................................................................................................. 36
6.19 SYS Mode Calendar Read Command (RD).................................................................................. 37
6.19.1 Description.............................................................................................................................. 37
6.19.2 Command/Response.............................................................................................................. 37
6.20 SYS Mode Calendar Write Command (WD) ................................................................................. 38
6.20.1 Description.............................................................................................................................. 38
6.20.2 Command/Response.............................................................................................................. 38
6.21 SYS Mode Total Counter Reset Command (ST)........................................................................... 39
6.21.1 Description.............................................................................................................................. 39
6.21.2 Command/Response.............................................................................................................. 39
6.22 SYS Mode Simulated Analog Output Command (SA) .................................................................. 40
6.22.1 Description.............................................................................................................................. 40
6.22..2 Command/Response............................................................................................................. 40
6.23 Special Commands (SC) with EL4401.......................................................................................... 41
6.23.1 Function Codes 00 through 04 ............................................................................................... 41
(1) Description................................................................................................................................ 41
(2) Command/Response................................................................................................................ 41
6.23.2 Function Codes 05 through 07 ............................................................................................... 42
(1) Description................................................................................................................................ 42
6.23.3 Command/Response.............................................................................................................. 42
6.24 Special Commands (SC) with EL4501 and EL4511...................................................................... 43
6.24.1 Function Codes 00 through 03 ............................................................................................... 43
(1) Description................................................................................................................................ 43
(2) Command/Response................................................................................................................ 43
6.24.2 Function Codes 04 through 07 ............................................................................................... 44
(1) Description................................................................................................................................ 44
6.24.3 Command/Response.............................................................................................................. 44
7. ABOUT BCC / SUMCHECK.............................................................................................................. 45
8. ABOUT CR/LF................................................................................................................................... 46
9. ABOUT DURATION BETWEEN MESSAGES .................................................................................. 47
10. CODES ASSIGNED TO UNITS......................................................................................................... 48
11. ASCII CODE...................................................................................................................................... 49

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1. COMMUNICATION CAPABILITY OVERVIEW
With EL4001, communication between EL4001 and the host system (personal computer, sequencer, etc.)
is available via RS-485. By communication, you can read the information displayed in the RUN mode,
read/write the setup parameters in the SET and/or SYS mode, or by popping the key card into the drive,
you can read/write the viscosity, density, and liquid kind you want to set up.
●No handshake: Nonprocedural
●One master to n slaves: n-multipoint communication (n: a maximum of 16 units)
●Compatible with local/remote selection : Shown on the LCD screen
※ We do not offer software support for higher-level systems.
2. NETWORK CONFIGURATION
A higher-level (host) system (PC, sequencer, etc.) and lower-level systems (EL4001) are connected in a
network shown below.
※Be sure to connect a terminating resistance (100 Ωapprox.) at both ends of the cable. EL4001 has a
100 Ωterminating resistor internally. At the end of communication channel, place the DIP switch at the
rear in the ON position; at an intermediate point in the channel, place it in the OFF position.
Host
Computer
RS-232C
↓
RS485
TerminatingResistor
TerminatingResistorON
TerminatingResistorOFF
ＥＬ４００１ ＥＬ４００１
RS-232C

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2.1 About Write Protect
2.1.1 Write Protect with a Password
（1）Functions of Basic EL4001
Parameter write protect can be selectably enabled or disabled at the password setup menu in the
SYS mode. While the password setup is "ON", the computer prompts you to enter the password when
changing the RUN mode to other mode. When the password entered is identical with the registered
password, a switch to another mode is permissible. If not, a reminder message appears, prompting you to
enter the correct once again.
With the parameter setup cared inserted in the drive, on the other hand, entering a new parameter into
the card while the password setup is "ON", the registered password is also written in the card.
Inserting the card with the password setup in the "ON" while a transfer from the RUN mode to another
mode takes place, you can change modes to another mode without the need of keying in a password if
the password that has been written in the card is identical with the registered password. If not, a reminder
message appears, prompting you to enter the correct password again. In this case, you need to key in
the password.
（2）Operation in Communication
In communication, you can change modes with the mode select command. By including a password in
the message at this time, write protect is enabled. With the password setup placed in "ON", a change to
another mode is permitted if the password in the message is identical with the registered one, similar to
the mode selection with keystrokes. If not, a reminder message is sent out. However, when the password
setup is in "OFF", the computer will override the password in the message.
（3）How to Reset a Password
In the password setup in the SYS mode, if "OFF" is your option for the setup, the computer will no longer
prompt you to enter the password.
（4）Where unable to Reset a Password
If you have forgotten your password and are unable to reset it, there is no way to reset it by
communication. In such a case, you can place the DIP switch inside the computer in the password setup
"OFF".
This resets the password, but it requires you to open up the computer front panel.
※CAUTION: For details of DIP switch setup, see EL4001 Key Operation Manual.
SETMode
RUNMode
SYSMode
ModeSelect
Screen Passwordentryscreen
Passwordentryscreen

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2.1.2 Write Protect with DIP Switch
（1）Functions of Basic EL4001
By setting up the DIP switch on the basic EL4001 side, you can inhibit mode changes to the SET and
SYS mode. When protected, in function keys, "SET MODE" and "SYS MODE" will no longer appear on
the screen.
※For details of DIP switch setup, see EL4001 Key Operation Manual.
（2）Operation in Communication
In data communication, when you attempt to change modes with the mode select command, a message
will tell you with a response code that settings are write protected if so configured.
Write protected
→
Write enabled →

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3. LOCAL/REMOTE SELECTION
The communication modes in the EL4001 are defined as AUTO/MANUAL statuses.
AUTO allows reconfiguration of settings through communication or keystrokes (local/remote).
In MANUAL, control through communication is disabled.
MANUAL: Only data entry through keystrokes is valid. Communication is unconditionally disabled.
Set up at the communication setup menu in the SYS mode.
AUTO: Changes in settings by keystrokes or communication are acceptable.
Set up at the communication setup menu in the SYS mode.
Local: Only keystrokes are acceptable. In the RUN mode, switching from one mode to another
made through communication brings up a message telling you of the switchover, and goes
into the remote mode.
Remote: Only communication is acceptable. In the RUN mode, keying in brings up a message
prompting you whether to switch into local, and goes into local if option is YES.
Local/remote and mode relationship
LOCAL REMOTE
ＭＡＮＵＡＬ
ＭＡＮＵＡＬ
ＡＵＴＯ
ＡＵＴＯ
Comm.denied
Comm.denied
Comm.denied
Keystroke
Setupatcomm.
Setupmenu
InSYSmode
keystrokesonly
ＲＵＮ
mode
ＲＵＮ
mode
ＲＵＮ
mode
ＲＵＮ
mode
ＲＵＮ
mode
ＲＵＮ
mode
Selectableonly
InRUNmode
Writeprotected
Comm.denied
Selectionthrucomm.
Selectionthrukeystrokes
SetupthruDIP
Readable
rangethru
comm.
Writable
rangethru
.comm.
Comm.only
ＥＸＴ
mode
ＥＸＴ
mode
ＳＹＳ
mode
ＳＹＳ
mode
ＳＹＳ
mode
ＳＥＴ
mode
ＳＥＴ
mode
ＳＥＴ
mode
RemoteLocal
※Note …When you want to make this operation in the local state with IC card (a key
card for EL4511, an adjust card for maintenance, and a model setting
card) inserted, do it from the PC of higher level with communication stopped.

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3.1 Mode Select Map
Shown below is the mode transition diagram.
Communication (remote)
To normal RUN mode
Other than RUN
mode
Comm. command
After showing for 3 seconds

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4. SETUP ITEMS FOR COMMUNICATION
You can access communication-related menu items in the SYS mode.
4.1 Menu Items
Communication-related menu items include
Communication modes : AUTO/MANUAL
Transfer rate : 1200, 2400, 4800, and 9600
Data bit number : 7 bits and 8 bits
Stop bit : 1 bit, 1.5 bits, and 2 bits
Home address : 2-digits hexadecimal: 00 to 0F
Terminate : None, LF, CR, and CR + LF
BCC：None, BCC, SUM
Parity：None, odd or even
4.2 Menu Trees
SYS mode-related setup menus are given below.
ＭＯＤＥ
ＭＯＤＥ Select(AUTO/MANUAL)
ｂｐｓＲＡＴＥ
ｂｐｓＲＡＴＥ Select(1200,2400,4800,9600)
ＤＡＴＡＢＩＴ
ＤＡＴＡＢＩＴ Select(7bits,8bits)
ＳＴＯＰＢＩＴ
ＢＰＳＢＩＴ Select(1bit,1.5bits,2bits)
ＡＤＤＲＥＳＳ
ＡＤＤＲＥＳＳ Select(00thru0F)
ＴＥＲＭＩＮＡＴＥ
ＴＥＲＭＩＮＡＴＥ Select(Non,LF,CR,CR+LF)
ＢＣＣ
ＢＣＣ Select(None,BCC,SUM)
ＰＡＲＩＴＹ
ＰＡＲＩＴＹ Select(None,odd,even)
SYSMode
ＣＯＭＭＵＮＩＣＡＴＩＯＮ
※Fordetailsaboutmenuitems,seeEL4001KeyOperationManual.