Bus Address; Bus Parameters; Communication Indicator - S+S Regeltechnik AERASGARD AC02-Modbus Operating Instructions, Mounting & Installation

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HYGRASGARD

BUS ADDRESS

Bus address
(binary coded, value selectable from 1 to 247)
DIP 1 DIP 2 DIP 3
128 64
O N O N OFF
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

BUS PARAMETERS

Baud rate
(selectable)
9600 baud
19200 baud
38400 baud
Reserved
Parity
(selectable)
EVEN
(numbered)
ODD
(numbered)
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 inactive (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
AFTM- ⁄ KFTM - LQ - CO2 - Modbus | Configuration
DIP 4 DIP 5 DIP 6
32 16 8
OFF OFF OFF
The switch positions shown here result in the Modbus address 128 + 64 + 1 = 193
DIP DIP
1 2
O N OFF
O N O N
OFF O N
OFF OFF
DIP Parity check
3 (on / off)
Active
O N
(1 stop bit)
Inactive (no parity)
OFF
(2 stop bits)
DIP 7 DIP 8
4 2 1
OFF O N
MODBUS
DIP switch [ B ]
ON DIP B
1 2 3 4 5 6
DIP 8N1 mode
4 (on / off)
O N
Active
OFF Inactive (default)
18
MODBUS
DIP switch [ A ]
ON DIP A
1 2 3 4 5 6 7 8
DIP Bus termination
5 (on/off)
O N
Active
OFF Inactive
Rev. 2021 - V32 intro
DIP
6
O N
OFF