3.3.3. GND TERMINALS CONNECTION
Connection of GND terminals of RS485/422 interfaces, devices connected to RS485/422 bus, should be done in the case of the
potential difference of the signals grounds on interfaces RS485 / RS422, which prevents proper data transmission.
Cannot connect to the GND terminal - cables screens, PE circuit of electrical installation, signals grounds of other devices.
3.3.4. LINE TERMINATION Rt
The application of Line Termination (terminator) Rt = 120 ohms will reduce electrical reflection in data line at high baud rate. It is not
needed below 9600Bd. Should be used the Line Termination resistor if the distance is over 1000m @ 9600Bd or 700m @ 19200Bd,
and if the disturbance in transmission will appear.
Example connection of Rt are shown on Fig. 5 & 6. Two Rt=120
W
, 5%, 0,25W are delivered with the module.
3.4. CONNECTION OF CIRCUITS TO DIGITAL INPUT & OUTPUT
Digital Input & Output in ADA-DIOC40 module are available on screw terminal block, described as:
- digital input DI+, DI-,
- digital output DO+, DO-.
The method of connection the circuits to digital input and output of ADA-DIOC40 module is shown below.
Fig 7. Example connection of circuits to input and output of ADA-DIOC40
3.4.1. CONNECTION OF QS18VP6LPQ PHOTOCELL TO DIGITAL INPUT
In case of monitoring changes of the output status QS18VP6LPQ photocell, connect it to digital input of ADA-DIOC40 module like on
the figure below. Additionally, the module has to be configured to communication mode “Signalling DI Status” (see section
CONFIGURATION)
Fig 8. Example connection of QS18VP6LPQ photocell to the input of ADA-DIOC40 module
7
ADA-DIOC40
(SW1)
G
N
D
T
X
+
/A
T
X
-
/B
R
X
+
R
X
-
(RS485/RS422)
PWR
DO
DI
ADA-DIOC40
ISOLATED INPUT / OUTPUT
MODBUS MODULE
RS485 4-wire
or RS422
RS485
2-wire
V
-
V
+
10 – 30
VDC
N
C
D
O
+
D
O
-
N
C
N
C
D
I
+
D
I
-
N
C
INPUT
OUTPUT
Power Supply
10 - 30 VDC
V+
V-
(SW1)
G
N
D
T
X
+
/A
T
X
-
/B
R
X
+
R
X
-
(RS485/RS422)
PWR
DO
DI
ADA-DIOC40
ISOLATED INPUT / OUTPUT
MODBUS MODULE
RS485 4-wire
or RS422
RS485
2-wire
V
-
V
+
10 – 30
VDC
N
C
D
O
+
D
O
-
N
C
N
C
D
I
+
D
I
-
N
C
INPUT
OUTPUT
Power Supply
10 - 30 VDC
V+
V-
QS18VP6LPQ
bu-3 (-)
bk-4
wh-2
bn-1 (+)
Summary of Contents for ADA-DIOC40
Page 19: ...19 ADA DIOC40...
