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Immediately after power-up, both instrument, and PC comms
settings need to be made compatible before communication
between them is possible. Instrument defaults are shown
below together with available options.

(Address)  

This is a unique identification

number that must be allocated to each
instrument connected to the network.

Default = 0.

Options;  

1 to 247

(Baud rate)

The setting determines the serial

communication data transmission rate in
bits/sec, and must match the PC settings.

Default = 9600.

Options;

1200; 2400; 4800; 9600

and 

19200

NOTE:

If a comms board has been retro fitted

the default baud rate is 1200.

(Data)

Sets the transmission format,

and must match the PC settings

Data Format Table

Settings

Start bits 

Data bits 

Parity 

Stop bits

Default

1

8

n (none)

1

Option 1

1

8

e (even)

1

Option 2

1

8

o (odd)

1

(Debug)  

Commissioning and

troubleshooting aid. Display shows when the
instrument is transmitting or receiving data by
rapidly flashing the three horizontal segments
of the first and last digit of the display.

First digit = Tx;  last digit = Rx
Default = Off.

Options;  

off; on

Only use dbuG during commissioning or trouble-shooting
because it shares display segments and therefore corrupts
the normal display.

Instrument Comms Settings

7

!

ADDR

BAUD

DATA

DBUG

Summary of Contents for CALCOMMS 3300

Page 1: ...Application Guide for Installation and Cabling of the Communications Option for CAL 3300 9300 9400 9500 Controllers 8th November 1999 Ver 1 10 Doc 33010 Iss 005...

Page 2: ...9501 available from most leading distributors and stocked by CAL 2 FITTING A COMMUNICATIONS INTERFACE BOARD The RS232 and RS485 interface boards are interchangeable and are fitted in exactly the same...

Page 3: ...ent At the same time ensure the hole in the Comms board fits over the screw thread Screw the Brass Half Nut onto the Comms board Do not overtighten but ensure it s tight enough to stop the board from...

Page 4: ...to PC s and is designed for serial communications with single instrument up to distances of 15 metres in a low electrical noise environment Connection is via a screened two core cable where the volta...

Page 5: ...low receivers to receive invalid data bits due to electrical noise on the cable To prevent this the lines should be forced into a known state by fitting two 620 ohm bias resistors to one point node If...

Page 6: ...r supply to be fitted this provides the extra power for the biasing resistors and also the power to drive all 128 controllers over 1200 meters EXTERNAL POWER SUPPLY The recommended external power supp...

Page 7: ...19200 NOTE If a comms board has been retro fitted the default baud rate is 1200 Data Sets the transmission format and must match the PC settings Data Format Table Settings Start bits Data bits Parity...

Page 8: ...press to index to chosen address number 1 to 247 Note In the absence of any conflicting information the following comms settings should be left as the default values see details on page 7 To read or a...

Page 9: ...the bus a recommended minimum PC specification would be a Pentium 200MHz processor with 64Mb of RAM To keep CPU and RAM usage to a minimum it is generally good practice not to log data more frequently...

Page 10: ...hin Herts SG5 1RT UK Tel 44 0 1462 436161 Fax 44 0 1462 451801 email support cal controls co uk http www cal controls com CAL Controls Inc 1580 S Milwaukee Avenue Libertyville IL 60048 USA Tel 847 680...

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