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2 Adjust this to the desired value using the UP and DOWN arrow
buttons and press STORE.
➔ (– – – –) will be displayed to indicate that the new value has
been saved and the value that was saved is re-displayed for
verification.
➔ The relay R1 time delay must be shorter or equal to that set on
the relay R2 time delay.
➔ If adjusting time delays during the wait period, the new setting
will not take effect until after the previous set time has expired
(or the flame is detected).
4.3.3 setting the UV Gain
The UV gain (00-99) can be set as follows:
1 If both the A and B configurations are used, first select the
channel to be configured (A or B) by pressing and holding the
appropriate button until it starts flashing.
2 Next press both the A and B buttons simultaneously (not the
Gain Set button).
3 The LED for the channel being adjusted will flash and "AdJ?"
will be displayed.
4 To select manual adjustment, press the YES button. Pressing
the NO button will result in the next step.
5 In adjust mode note display (Au32). Using the UP and DOWN
arrows, adjust the gain to the desired value and press YES
to store (do not push the STORE button to store the val-
ue).(– – – –) will be displayed to indicate that the value has
been saved and the value that was saved is re- displayed for
verification.
➔ In default mode, note display (dEF?). Press YES to reset all
channel settings to default.
➔ The processor will remain in adjust mode until the value is
stored with the YES button or aborted with the NO button.
4.3.4 Gain set Button (Adjusting 4 to 20 mA output)
Use the Gain Set button only to adjust the analog output gain
(also indicated by the bar graph display). Use the UP and DOWN
buttons to adjust until the correct value is displayed and press
STORE to save.
Utilizing the bar graph as an indicator to the output is helpful in
adjusting this value. The (– – – –) will be displayed to indicate that
the value has been saved and the value that was saved is re-dis-
played for verification.
4.3.5 Changing Between 0 to 20 and 4 to 20 mA
At power-up, the current setting is displayed (followed by the
Firmware version and viewing head detected).
To change from 4-20mA to 0-20mA analog output:
1 While holding the UP and DOWN buttons, simultaneously press
the FLAME ON, AUTO/MAN and GAIN SET buttons. Release
the FLAME ON, AUTO/MAN and GAIN SET buttons.
2 While continuing to hold the UP and DOWN buttons, press R1
TRIP DELAY and R2 TRIP DELAY buttons.
3 While continuing to hold the UP and DOWN buttons, simulta-
neously press the FLAME ON, AUTO/MAN and GAIN SET
buttons. The new setting will be dis-played.
4.3.6 Viewing Head temperature
Press both the RESET and the DOWN Buttons simultaneously on
the P222 to display the internal temperature of the viewing head.
Excessively high temperatures may reduce the life of the view-
ing head. The P222 will display a high temperature warning by
flashing the viewing head temperature if the internal viewing head
temperature exceeds specified limits.
4.4 Modbus Communications
The P222 communicates with any host computer that can be
connected to a USB to RS422 or RS485 converter running appro-
priate Modbus protocol software. The baud rate is displayed with
the module address in the current versions (see SETTING AD-
DRESSES, section). The data transmitted to and from the P222
is over two twisted pairs that are differentially driven and received
according to the RS-422 standard (it can also be configured to
communicate over a single shielded twisted pair using the RS-485
standard). The differential mode allows long wire runs in harsh
environments.
4.4.1 Communication setting (setting Addresses)
The P222 can communicate in Modbus RTU mode, with the
following configuration:
– 4800, 9600, 19200 or 38400 baud (adjustable)
– 8 data bits (fixed)
– none, odd or even parity (adjustable)
– 1 stop bit (fixed)
The factory default of a P222 unit Modbus address 0. It is impor-
tant to change the address number so that there are no duplicate
addresses when setting up a network and/or replacing a proces-
sor.
To change or check the unit Modbus address number of the
P222, proceed as follows:
1 Press and hold the Reset button for 2 seconds.
➔ The 4 LED digits will show the baud rate and the Modbus
address. The 2 leftmost digits are the baud rate (19, 38, 48 or
96); the 2 rightmost digits are the station number from (0 to
63).
2 Press the up/down button to change the Modbus address.
➔ When the display passes 63, it will indicate the baud rate.
Pressing the up arrow button at this point will select a higher
baud rate. For a lower baud rate, press the down arrow button
until the display passes 0. Pressing the down arrow button at
this point will select a slower baud rate.
3 Press the Store button to save the new Modbus address.
4 Press and hold the Reset button for 2 seconds.
5 The 4 LED digits will show the baud rate and the station
number.
6 Simultaneously push the 2 buttons Flame On and Auto/Man.
➔ The parity will immediately change to and display the new
setting.
4.4.2 MoDBUs RtU Functions supported
– 03 Holding Register Read
– 06 Preset Single Holding Register
– 16 Preset Multiple Holding Register
4.4.3 Communication With Human-Interface Host Computer
A number of Modbus drivers for your operating system are availa-
ble from third party developers. These drivers allow your applica-
tion programs to communicate with the P222 signal processors
directly.
4.4.4 Rs-422 ConVeRsIon
Numerous converters are available to convert to RS-422 or RS-
485 from RS-232, USB, EIA-232-E or TTL serial.
EN-5
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