Rs232 Interface - jotron Tron AIS TR-8000 Technical Manual

3.1.1.1 Electrical characteristics RS422 interface.
Parameter
V Voltage at either bus I/O terminal
O
V Differential input voltage
ID
R Differential input resistance
L
V Positive going input threshold voltage
IT(+)
V Negative going input threshold voltage
IT(-)
Isolation
I Output current Receiver
O
Differential output voltage magnitude
I Output current Driver
O

3.1.2 RS232 interface

The functionality if the External Display can be setup by software to use the RS232 port as physical interface
instead of the RS422 port which is default. The baud rate is fixed to 38400. The Interface is galvanically
isolated by an ISO7221A Optocoupler. The connector on the Transponder is 5mm Double Deck Terminal
Strips from WAGO (736-204).
Figure 2: Simplified diagram of the RS232 interface
TR-8000 Technical manual
Test Condition
A,B
A with respect to B
w/jumper
Wo/jumper
I = -8mA
O
I = 8mA
O
60s
I = 0mA, no load
O
R = 54Ω
L
R = 100Ω
L
MIN TYP MAX
-15 15
-15 15
232
7680
-85 -10
-200 -115
2500
-8 8
3 4.3 5
1.5 2.3
2 2.3
-60 60
3-12
UNIT
V
V
Ω
Ω
mV
mV
Vrms
mA
V
V
V
mA