FGH 2000 Series Manuale per l'uso e la cura

Communications Manual

Series 2000

FGH Controls Ltd

Openshaw Way,Letchworth

Herts. SG6 3ER

Tel:

(

01462

)

686677

Fax:

(

01462

)

480633

Email: [email protected] www.fgh.co.uk

SERIES 2000 COMMUNICATIONS MANUAL 1

M41 Issue 1.1

SERIES 2000 COMMUNICATIONS MANUAL.

CONTENTS.

1.0 GENERAL DESCRIPTION. ........................................................................................................................................2

1.1 Specification. ...........................................................................................................................................................2

1.1.1 2-Wire EIA-485 Mode (RS485) .......................................................................................................................2

1.1.2 4-Wire EIA-422-A Mode (RS422)....................................................................................................................2

2.0 CONNECTIONS......................................................................................................................................................2

2.1 General. ...................................................................................................................................................................2

2.2 2 Wire EIA-485 Mode (RS-485).............................................................................................................................3

2.3 4-Wire EIA-422-A (RS-422) ...................................................................................................................................3

2.4 Connection reference table ....................................................................................................................................4

2.5 Software Configuration...........................................................................................................................................4

3.0 COMMUNICATIONS PROTOCOL.............................................................................................................................4

3.1 Message construction .............................................................................................................................................4

3.1.1 Write messages ................................................................................................................................................4

3.1.2 Read messages ................................................................................................................................................5

3.1.3 Set instrument status messages ......................................................................................................................5

3.2 Message header......................................................................................................................................................5

3.3 Instrument address..................................................................................................................................................6

3.3.1 Wildcard addresses ..........................................................................................................................................6

3.4 Message parameter code. ......................................................................................................................................6

3.5 Segment number field (P2000 Only). .....................................................................................................................6

3.6 Message data field ..................................................................................................................................................6

3.7 Controller read/write parameter codes ...................................................................................................................6

3.8 Programmer read/write parameter codes...............................................................................................................8

3.9 Controller Set status codes. ....................................................................................................................................8

3.10 Programmer Set status codes................................................................................................................................9

3.11 Response from read or write ..................................................................................................................................9

3.12 Set status response ................................................................................................................................................9

3.13 Controller error responses....................................................................................................................................10

3.13.1 Corrupt message response ..........................................................................................................................10

3.13.2 Syntax error response....................................................................................................................................10

3.14 Data fields .............................................................................................................................................................10

3.14.1 Data field type 1..............................................................................................................................................10

3.14.2 Data field type 2.............................................................................................................................................11

3.14.3 Data field type 3.............................................................................................................................................11

3.14.4 Data field type 4 (P2000 Only) ......................................................................................................................13

3.14.5 Data field type 5 (P2000 Only) ......................................................................................................................13

3.14.6 Data field type 6 (P2000 Only) ......................................................................................................................13

3.15 Coded data fields. .................................................................................................................................................14

3.15.1 Alarm type codes. ..........................................................................................................................................14

3.15.2 Setpoint type codes........................................................................................................................................14

3.15.3 Ratio limit reference type codes.....................................................................................................................14

3.15.4 Hold type codes (P2000 Only) .......................................................................................................................15

APPENDIX A - BASIC COMMUNICATIONS PROGRAM.................................................................................................16

2 SERIES 2000 COMMUNICATIONS MANUAL

M41 Issue 1.1

1.0 GENERAL DESCRIPTION.

The FGH S2000 controller or P2000 programmer all have serial communications fitted as

standard. This takes the form of 2 way serial asynchronous communication with a

computer.

Messages consist entirely of ASCII characters and may or may not contain spaces as

desired.

All messages are terminated with a carriage return, <CR>.

2-Wire EIA-485 (RS-485) or 4-Wire EIA-422-A (RS-422) serial communication standards

are supported.

1.1 Specification.

1.1.1 2-Wire EIA-485 Mode (RS485)

Transmission standard: EIA-485 (RS-485)

Data rates: 1200, 2400, 4800 and 9600 baud.

Data format: 1 start, 7 data, odd parity, 1 stop bit.

Implementation: 2 wire half duplex.

Max drivers per line: 32

Max receivers per line: 32

Max cable length: 1200 metres/3937 feet

1.1.2 4-Wire EIA-422-A Mode (RS422)

Transmission standard: EIA-422-A (RS-422)

Data rates 1200, 2400, 4800 and 9600 baud.

Data format 1 start, 7 data, odd parity, 1 stop bit.

Implementation 4 wire half duplex.

Max drivers per line 1

Max receivers per line 10

Max cable length 1200 metres/3937 feet

2.0 CONNECTIONS.

2.1 General.

The series 2000 may be connected to any computer or device which supports the RS422

or RS485 interface standards. This includes any other communicating instruments such

as the series 1000 or any other instrument using the FGH standard protocol.

The instrument uses a balanced voltage communications system which will perform well

under most situations provided some simple guidelines are adhered to.

1. The communications wiring should be implemented using screened cable comprising

one or two twisted pairs. The cable screen should be earthed at one point only.

2. The cable should be routed well away from sources of electrical noise such as motors,

contactors and any other high voltage wiring.

SERIES 2000 COMMUNICATIONS MANUAL 3

M41 Issue 1.1

3. The network should be wired as a daisy chain, taking the wires in to one instrument

and hence on to the next. Wiring spurs should be avoided. Take care to continue the

cable screen on to the next instrument.

4. For long cable runs or noisy environments it may be necessary to fit a terminating

resistor to the network. The terminator ( a 220Ωresistor ) should be fitted between

RX+ and RX- on both the computer and the furthest instrument. For two wire networks

this resistor should be fitted at the computer end only. Only one such resistor should

be fitted on each wire pair.

2.2 2 Wire EIA-485 Mode (RS-485)

This diagram shows the connection for EIA-485 mode. Note the use of screened cable. This

connection method may be continued on to other instruments up to the maximum allowed.

2.3 4-Wire EIA-422-A (RS-422)

This diagram shows the connection for EIA-422 mode. Note the use of screened cable.

This connection method may be continued on to other instruments up to the maximum

allowed.

4 SERIES 2000 COMMUNICATIONS MANUAL

M41 Issue 1.1

2.4 Connection reference table

Instrument

Terminal

Function EIA-485 EIA-422-A

13 TX- TX-/RX- TX-

14 TX+ TX+/RX+ TX+

15 RX+ TX+/RX+ RX+

16 RX- TX-/RX- RX-

1 EARTH N/C or

SCREEN

N/C or

SCREEN

2.5 Software Configuration.

Software configuration of the instrument may be performed once the instrument has been

placed in 'E mode'. This is done by removing the instrument from its sleeve and setting the

'E mode' switch to ON. The instrument is then replaced in its sleeve and power re-applied.

Use the scroll button (>) to scroll through elements until the ConS group is reached. Press

the star button to access the group.

Scroll to the element bAUd and select the baud rate required from 1200, 2400, 4800 or

9600 using the up/down keys

Scroll to the element AddrS. This is the controller instrument address and may be set

between 0 and 99 using the up/down keys. If the instrument is a P2000 programmer then

the controller part of the instrument will have an address as set by this parameter and the

programmer part of the instrument will have an address which is the controller address plus

16.

3.0 COMMUNICATIONS PROTOCOL

3.1 Message construction

Messages to and from the instrument vary in form depending on, amongst other things, the

type of message and its contents. There are three basic message types:-

3.1.1 Write messages

Write messages to the instrument take the following form.

WAAPSSD..D<CR>

where W= write message header

AA = instrument address

P= parameter code

SS = segment number field (P2000 Only)

D..D = numeric data field

SERIES 2000 COMMUNICATIONS MANUAL 5

M41 Issue 1.1

messages to the instrument may have the fields separated by spaces. These spaces will be

ignored. Messages from the instrument will not contain spaces. Eg.

W 45 C 0123 <CR>

will attempt to write 123 to the local set point as well as

W45C0123<CR>

The <CR> at the end of the message is a carriage return. (Hex 0D). Each message written

to the instrument must be terminated with, and each message from the instrument will be

terminated with a carriage return.

3.1.2 Read messages

Read messages to the instrument take the following form.

RAAPSS<CR>

where R= read message header

AA = instrument address

P= parameter code to be read

SS = segment number (P2000 Only)

Again the message must be terminated with a <CR>, and spaces may be included if

desired.

3.1.3 Set instrument status messages

Set messages to the instrument take the following form.

SAAC<CR>

where S= set message header

AA = instrument address

C= set parameter code to be performed

Again the message must be terminated with a <CR>, and spaces may be included if

desired.

3.2 Message header.

This may be;

ASCII Rsignifying a Read

ASCII Wsignifying a Write

ASCII Ssignifying a Set.

The Rheader is used whenever data is being read from the instrument. When this header

is used the data field is absent. The Wheader is used to write data to the instrument. The

Sheader is used to set the status of the instrument.

6 SERIES 2000 COMMUNICATIONS MANUAL

M41 Issue 1.1

3.3 Instrument address.

Each instrument must be given a unique address between 0 and 99. This is set when the

instrument is in E mode. The address field of the message, consisting of two ASCII

characters determines to which instrument the message is directed. The instrument ignores

the message unless it corresponds to its own address.

For serial communications purposes, the programmer and controller parts of the

instrument are treated as separate instruments. The controller part will recognise

messages whose address field corresponds exactly with the address programmed in

engineers mode. The programmer part will recognise the programmed address plus 16.

This fact should be borne in mind when assigning controller addresses on the network.

3.3.1 Wildcard addresses

If desired, a group of instruments can be written to together by using a wildcard character

(large X) in place of one or both of the address characters. eg.

W6XC0100<CR>

would result in all instruments on that communication line with addresses of 60 to 69 having

their local set point set to 100.

Instruments written to with wildcard addresses do not reply.

3.4 Message parameter code.

The parameter code field of the message is a single ASCII character. In a write message

this corresponds to one of the control parameters listed in paragraph 4.6, 'parameter codes'.

In the case of set messages, this is still a single ASCII character, but corresponds to one of

the 'set status codes' listed in paragraph 3.7.

3.5 Segment number field (P2000 Only).

This field is used to specify the segment number reference required for some messages to

the profile generator. The segment number should be a two digit field, left padded with a

zero if required.

3.6 Message data field

The message data field consists of between four and eight ASCII characters and carries the

data associated with the specified parameter. There are six types of data field, the type

depending on the particular parameter being accessed. The parameter code tables in

section 3.7 and 3.8 specify the data field format for each parameter.

3.7 Controller read/write parameter codes

Each parameter within the controller is assigned a single alpha code. The meaning of this

code may vary according to the controller action type, eg. heat/cool, motorised valve etc.

SERIES 2000 COMMUNICATIONS MANUAL 7

M41 Issue 1.1

Please note that some parameters use coded data fields, the code meanings are listed

after the table.

Code R/W Parameter Scroll

Element

Data field

type

@ R/W Comms remote setpoint - 1

A R Measured variable - 1

B R/W Output in 0.1%

Desired valve position

C R/W Local setpoint SP-L 1

D R/W Propband in 0.1%

Ratio in 0.1%

ProP

rAt

E R/W Integral action time in S

Ratio low setpoint output limit

IAt

LoOP

F R/W Derivative action time in S

Ratio low thermal head limit

dAt

tHLo

G R/W Derivative approach band in Xp

Ratio approach band

APr

bAnd

H R/W Heat high power limit in 0.1%

Ratio high air setpoint limit

H-PL

HiOP

I R/W Heat TP cycle time in S

Ratio positive reference type

HCyC

rEFH

J R/W Alarm 1 level ALr1 1

K R/W Alarm 2 level ALr2 1

L R Controller status - 2

M R/W User Retransmit value - 1

N R Resultant (control) setpoint - 1

O R/W Setpoint type code StyP 1

P R/W Alarm 1 type code A1ty 1

Q R Instrument type code - 3

R R Analogue remote setpoint value - 1

S R/W Alarm 2 type code A2ty 1

T R/W Heat low power limit in 0.1%

Cool high power limit in %

Ratio max thermal head

L-PL

C-PL

tHHi

U R/W Setpoint ramp rate in digits/hour rAtE 1

V R/W Cool TP cycle time in S

Valve action time in S

Ratio negative reference type

CCyC

VAt

rEFL

W R/W Cool relative prop band in 0.1 rEL 1

X R/W Heat/Cool deadband in 0.1%

Motor valve deadband in 0.1%

dbnd

Y R/W Auxiliary setpoint 1 SP1 1

Z R/W Auxiliary setpoint 2 SP2 1

8 SERIES 2000 COMMUNICATIONS MANUAL

M41 Issue 1.1

3.8 Programmer read/write parameter codes

The table below shows the meaning of all the parameter codes available in the profile

generator.

PARAMETER

CODE

FIELD

MEANING READ

ONLY

DATA

FIELD

C N/A Profile setpoint YES TYPE 1

D N/A Delay start time in mins NO TYPE 1

E N/A Segment Elapsed time in mins YES TYPE 1

H N/A Profile hold band in digits NO TYPE 1

I N/A Profile hold type NO TYPE 1

(coded)

J N/A Profile repeats NO TYPE 1

K N/A Number of repeats remaining YES TYPE 1

L YES Segment target level in digits NO TYPE 1

M N/A Current event status YES TYPE 4

N N/A Ready mode event status NO TYPE 4

P N/A Profile pointer NO TYPE 1

Q N/A Profile status YES TYPE 5

R YES Segment event outputs NO TYPE 4

T YES Segment time in minutes NO TYPE 6

X N/A Profile currently running YES TYPE 1

3.9 Controller Set status codes.

Writing a set command to the instrument with a parameter as follows will produce the

specified action if the address field matches the address of the instrument. In the examples

given the instrument address is assumed to be 20.

CODE MESSAGE REPLY MEANING

M S20M<CR> *20M<CR> Set controller to Manual mode

A S20A<CR> *20A<CR> Set controller to Auto mode

P S20P<CR> *20P<CR> Turn on the pretuner

T S20T<CR> *20T<CR> Turn on the adaptive tuner

O S20O<CR> *20O<CR> Turn off pretuner and adaptive tuner

U S20U<CR> *20U<CR> Unlatch any latched alarms

SERIES 2000 COMMUNICATIONS MANUAL 9

M41 Issue 1.1

3.10 Programmer Set status codes.

Programmer set commands are signified by the Sheader as they are for the controller.

There are only four set parameter codes and their meanings are given below.

CODE MESSAGE REPLY MEANING

S S36S<CR> *36S<CR> Start profile pointed to by profile pointer

R S36R<CR> *36R<CR> Reset currently running profile

H S36H<CR> *36H<CR> Holds (pauses) execution of profile

F S36F<CR> *36F<CR> Frees hold allowing profile to continue

3.11 Response from read or write

The response of the instrument to a satisfactory read or write message with the correct

address will be as follows (unless an address wildcard is used, see para 3.3.1):

*AAPSSD..D<CR>

The instrument will respond with a string of ASCII characters. The header will consist of '*'

(Hex 2A).

The AA, Pand SS fields will be exactly the same as in the message which prompted the

response. The SS field will only be present for some messages to and from the profile

generator part of the instrument.

The format of the data field D..D is specific to the parameter code used and these field types

are described in section 3.14.

3.12 Set status response

The response of the controller to a satisfactory 'set status' message with the correct address

will be as follows (unless a wildcard address is used):

*AAP<CR>

The controller will respond with a string of ASCII characters. The header will consist of '*'

(Hex 2A). The header will be followed by an address (AA) showing the address of the

responding instrument in ASCII, 00 to 99.

after the address is a single ASCII character showing the 'set status' mnemonic used

This is followed by a <CR> to complete the message return.

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