Honeywell 700 User Manual

66-2069—02

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the computed ratio, for example, “AC” and “75.” Press either the 

ACCEPT RATIO or RESET keys. If ACCEPT RATIO is 

pressed, the display responds with “- -”, the ratio is stored, 

and the AUTO SET LED is turned on. If RESET is pressed, the 

display returns to the counts, both of the AUTO SETUP LEDs 

are turned off, and the old setpoints are used.

If the ratio computed as a result of BNR-ON and  BNR- OFF 

data sampling is higher than 80%, the display will show “UA” 

(unacceptable), alternating with the unacceptable ratio. For 

example, if the computed ratio is 93%, the display would 

alternate between “UA” and “93.” RESET must be pressed to 

clear this; the old values for RELAY ON and RATIO will remain 

in effect.

The values can be worse than just unacceptable.  If the flame 

relay de-energizes while reading BNR-ON values, the display 

will show “bo,” and data-taking will be aborted.  Other faults, 

such as a BNR-ON flame signal that is too low to use, or BNR-

OFF readings that are too close to the BNR-ON readings, can 

result in “rE” being displayed. RESET should then be pressed.

The signal processor also adjusts the viewing head gain during 

the BNR-ON and BNR-OFF data sampling sequence. 

Normally, after the sequence, the display should read about 

20, because the gain has been adjusted to give this reading. If 

it is less than about 18, you should find that the gain has been 

set to 9; if it is more than about 22, you should find that the 

gain has been set to 1.

Once the values have been stored through this sequence, you 

can check the RELAY ON SET POINT, the RATIO, or the 

GAIN by pressing the appropriate key for two seconds. 

However, if you attempt to change these values by pressing 

the INCREASE or DECREASE keys, the display will show 

“CF” (confirm), and the AUTO SET LED will flash rapidly. To 

confirm the desired change, press the RELAY ON SET-POINT 

key, the RATIO key, or the SET GAIN key a second time. To 

discontinue any changes, press the RESET key or simply wait 

four seconds for a time out to occur.

The user confirms they wish to make changes, the values will 

change when you use the INCREASE or DECREASE keys. 

Meanwhile, the AUTO SET LED will be flashing. The AUTO 

SET LED will de-energize only if the changed values are 

stored; if the changed values were not stored, the AUTO SET 

LED will light and the old values will remain in effect.

If values were obtained automatically, that is, if the AUTO SET 

LED is on and the BNR-ON SEQ START/END key is pressed, 

the display will also show “CF.” If the BNR-ON SEQ START/ 

END key is pressed again, the signal processor will begin the 

BNR-ON data sampling sequence.

Loading Factory Defaults

Fig. 18 shows the flowchart for restoring default values. 

Pressing and holding the LOAD FACTORY DEFAULTS button 

will result in the values shown in Table 3 being loaded and 

stored in EEPROM. During the automatic setup sequence, if 

the AUTO SET LED is on when the LOAD FACTORY 

DEFAULTS key is pressed, “CF” will be displayed. Press the 

LOAD FACTORY DEFAULTS key again to confirm the change, 

or press RESET to abort the change. If the factory defaults 

are loaded, the AUTO SET LED will be turned off.

A pattern of key presses will result in the panel being locked 

so as to block any changes to the values stored in the signal 

processor. With the panel locked, values may be examined, 

but the signal processor will not respond to the STORE key.

The panel should be locked after the setpoints are set. 

Contact the factory to obtain the procedure to lock or unlock 

the panel.

The 700ACSP and 700DCSP signal processors are capable 

of communication with Flametools software running on a 

Microsoft

®

 Windows

®

 PC, S7999D touch screen or other 

device that supports Modbus RTU protocol. Both Flametools 

and the S7999D include graphic user interfaces. Other 

devices will require the user to generate an interface. The data 

transmitted to and from the 700ACSP/700DCSP is over two 

twisted pairs that are differentially driven and received 

according to the RS-422 standard. Honeywell offers a RS485/

422 to USB converter to use in conjunction with the 700ACSP/

700DCSP signal processors. The Honeywell part number is 

COMMOD.

Refer to Fig. 7 and Fig. 8 for a typical communication wiring 

and addressing scheme as well as the required wiring of the 

COMMOD communication converter.

The 700ACSP and 700DCSP signal processors have two 

modular phone jacks for RS-422 communications. The jacks 

are wired in parallel so that point-to-point cables can be 

jumped from unit to unit to interconnect multiple Model 700 

signal processors. The RS-422 interface IC is a MAX489. The 

ICs can drive up to quantity 32, Model 700 signal processors 

on the same bus.

For communication with external controls or computers, refer 

to Table 4 for the Modbus registers map.

700ACSP and 700DCSP can only communicate via Modbus 

RTU protocol, with the following configuration:

• 9600 baud

• 8 data bits

• no  parity

• 1 stop bit

NOTE: Default protocol must be changed in order to use 

Modbus communication. It may be set for Modbus by 

Relay on setpoint

16

Ratio (%) relay off/relay on

50%

FFRT (Flame Fail Response Time)

1 sec

0-20mA/4-20mA OPTION

4-20mA

UV/IR Gain 

5

Communication address

0