Modbus Communication; Loading Factory Defaults; Communication Setting; Modbus Rtu Function Supported - Honeywell 700 User Manual

HONEYWELL MODEL 700/800 SIGNAL PROCESSOR AND VIEWING HEAD

Loading Factory Defaults

Fig. 17 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.
Table 3. S70X/S80X Default Settings
Relay on setpoint
Ratio (%) relay off/relay on
FFRT (Flame Fail Response Time)
0-20mA/4-20mA OPTION
UV/IR Gain
Communication address
Panel Lock
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.
Working with Older UV Viewing
Heads
When the signal processor has been set up with an older UV
viewing head without communications, the settings may be
viewed and changed whether or not the viewing head is
connected. But, if the viewing head is changed from a new
intelligent type to an older UV type without communications,
the display panel will remain inoperative until pulses start
coming in from the old UV viewing head. Then the signal
processor will recognize the older UV viewing head, make the
appropriate changes, and begin responding to the keys
pressed on the front panel.

MODBUS COMMUNICATION

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.
66-2069—01
Refer to Fig. 6 and Fig. 7 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.
16

Communication Setting

50%
700ACSP and 700DCSP can only communicate via Modbus
1 sec
RTU protocol, with the following configuration:
4-20mA
• 9600 baud
5
• 8 data bits
0
• no parity
• 1 stop bit
NOTE: Default protocol must be changed in order to use
1.
2.
3.
The factory default Modbus address of the 700ACSP and
700DCSP is 0 and must be changed to a number between 1
and 32 to establish communication between the signal
processor and the host control. When more than one signal
processor is in the network, ensure that each signal processor
has a unique Modbus address within the range of 1 to 32.

Modbus RTU Function Supported

Four Modbus functions are supported:
• 01 Output coil read
• 03 Holding register read
• 06 Preset single holding register
• 16 Preset multiple holding register
NOTES:
—
—
—
—
16
Modbus communication. It may be set for Modbus by
using key sequence below at the front panel of the
700 as follows:
Press and hold BNR-OFF SEQ START/END
button for 2 seconds.
Press up arrow to change setting from P0 to P1.
Press STORE.
Before Model 700 signal processors are
connected to the RS-422 bus, their individual
Modbus addresses must be set to differing values
between 1 and 32.
The RESET button on front of the 700ACSP or
700DCSP signal processors is used to set the
Modbus address.
Press and hold the RESET button for two
seconds and the current address will appear. It
may be changed with the up or down arrow keys.
Pressing the STORE button will store the new
address.