18
BUS ADDRESS
Bus address
(binary coded, value selectable from 1 to 247)
MODBUS
DIP switch [A]
DIP 1
DIP 2
DIP 3
DIP 4
DIP 5
DIP 6
DIP 7
DIP 8
1 2 3 4 5 6 7 8
ON
DIP A
128
64
32
16
8
4
2
1
O N
O N
OFF
OFF
OFF
OFF
OFF
O N
Example shows 128 + 64 + 1 = 193 as Modbus address.
The device address in the range of
1 to 247
is set at DIP switch [A].
For switch positions 1 to 8 see the table on the back!
Address 0 is reserved for broadcast messages.
Addresses greater than 247 must not be assigned and are ignored by the device.
The DIP switches are binary-coded with the following values:
DIP 1 =
128
............ DIP 1 =
ON
DIP 2 =
64
............ DIP 2 =
ON
DIP 3 = 32 ............ DIP 3 = OFF
DIP 4 = 16 ............ DIP 4 = OFF
DIP 5 =
8 ............ DIP 5 = OFF
DIP 6 =
4 ............ DIP 6 = OFF
DIP 7 =
2 ............ DIP 7 = OFF
DIP 8 =
1
............ DIP 8 =
ON
The switch positions shown here results in the Modbus address
128 + 64 + 1 = 193
BUS PARAMETERS
Baud rate
(selectable)
DIP
1
DIP
2
MODBUS
DIP switch [B]
9600 baud
O N
OFF
1 2 3 4 5 6
ON
DIP B
19200 baud
O N
O N
38400 baud
OFF
O N
Reserved
OFF
OFF
Parity
(selectable)
DIP
3
Parity check
(on / off)
DIP
4
8N1 mode
(on / off)
DIP
5
Bus termination
(on/off)
DIP
6
EVEN
(numbered)
O N
Active
(1 stop bit)
O N
Active
O N
Active
O N
ODD
(numbered)
OFF
Inactive (no parity)
(2 stop bits)
OFF
Inactive (default)
OFF
Inactive
OFF
The baud rate (speed of transmission) is set at DIP switches 1 and 2 of DIP switch block [B].
Selectable are
9600 baud, 19200 baud,
or
38400 baud
– see table!
Parity
is set at DIP switch 3 of DIP switch block [B].
Selectable are
EVEN
or
ODD
– see table!
Parity check
is activated via DIP switch 4 of DIP switch block [B].
Selectable are
active (1 stop bit)
, or i
nactive (2 stop bits)
, i.e. no parity check – see table!
The
8N1 mode
is activated via DIP switch 5 of DIP switch block [B].
The functionality of DIP switch 3 (parity) and DIP switch 4 (parity check) of DIP switch block [B] is therefore deactivated.
Selectable are 8N1
active
or
inactive (default)
– see table !.
Bus termination
is activated via DIP switch 6 of DIP switch block [B].
Selectable are
active
(bus termination resistance of 120 Ohm), or
inactive
(no bus termination) – see table!
When bus parameters and bus address are changed at devices with
display
, the respective settings are shown on the display for
approx. 30 seconds.
COMMUNICATION INDICATOR
Communication is indicated via two LEDs. Error-free received telegrams are signalized by the green LED lighting up, regardless of
the device address. Faulty telegrams or triggered Modbus exception telegrams are depicted by the red LED lighting up.
DIAGNOSTICS
An error diagnostic function is integrated
G
HYGRASGARD
®
AFTM- ⁄ KFTM - LQ - CO
2
- Modbus
| Configuration
Rev. 2017 - V14 GB intro
