Vagner Pool 9202064K, Installation Manual

Page: 9 / 49

0000137936 rev. 6.1
7
Modbus communication connection
(only if present)
pH Setpoint reading example:
ADDR FUNC
DATA
start
Addr HI
DATA
start
Addr LO
DATA
bit # HI
DATA
bit # LO
CRC HI CRC LO
0X01 0X03 0X04 0X4C 0X00 0X01 0X44 0XED
pH Setpoint writing example:
ADDR FUNC
DATA
start
Addr HI
DATA
start
Addr LO
DATA
bit # HI
DATA
bit # LO
CRC HI CRC LO
0X01 0X06 0X04 0X4C 0X02 0X8A 0XC9 0XEA
pH Setpoint applying example:
ADDR FUNC
DATA
start
Addr HI
DATA
start
Addr LO
DATA
bit # HI
DATA
bit # LO
CRC HI CRC LO
0X01 0X06 0X0F 0XA0 0X00 0X02 0X0B 0X3D
Remote Start/Stop function:
when the system is stopped by remote the display shows Std-By ( on all the
screens ), following the examples to set start and stop by Modbus.
Remote start example:
ADDR FUNC
DATA
start
Addr HI
DATA
start
Addr LO
DATA
bit # HI
DATA
bit # LO
CRC HI CRC LO
0X01 0X06 0X04 0X6E 0x00 0X00 0xE9 0x27
Remote stop example:
ADDR FUNC
DATA
start
Addr HI
DATA
start
Addr LO
DATA
bit # HI
DATA
bit # LO
CRC HI CRC LO
0X01 0X06 0X04 0X6E 0X00 0X01 0x28 0xE7
Default parameter is OFF (off= Start), the system is set ON by Modbus command.
ON
1
SW
ModBus connection
Pin N°
Description
1 T+R+
2 T-R-
3 GND
4 Not used
SW) Leave the SWITCH on the “1” position. This switch is
intended to improve the communication and to reduce noise in
installations with very long cables (>50m). If you have long cables
and are facing communication problems, you can try to solve the
problem, sliding the IMPEDANCE MATCHING SWITCH to the
“ON” position only for the first and the last device present on the
bus. (i.e. the two devices farther away from each other). Leave
instead the IMPEDANCE MATCHING SWITCH on the “1”
position for all the other intermediate devices along the bus.