Appendix A -
Connector Pinout & Related
Specifications
The digital output is activated by an open drain MOSFET transistor driven by an optocoupler.
The maximum current flow into this transistor has a characteristic above the value specified
in the eWON, in order to cope with the switching power losses.
The transistor used is in an open drain type with predrive. This means the relay power supply
has to be supplied from an external source to the predrive electronics. The diagram next
page shows the external wiring needed for correct operation of the digital output. A relay
has been chosen for this sample application but any load within the specifications can be
used instead.
- Note -
This is a sink only output to ground (the transistor acts like a switch to ground).
A.4 Serial Interface (eWON Flexy 102 & 202)
Characteristic
Value
Physical modes
RS232/422/485 (1500V galvanic isolation through the power
supply isolation from ground)
Polarization
330
Ω (if polarization & termination are activated)
Termination
120
Ω (if polarization & termination are activated)
SUBD9 male
connector pinout
(eWON side)
Pin #
RS232
RS485
RS422
1
2
3
4
5
6
7
8
9
-
RXD
TXD
-
GND
-
RTS
CTS
-
-
-
A+
-
GND
-
-
B-
-
-
Rx+
Tx+
-
GND
-
Rx-
Tx-
-
Page 36 / 40
eWON Flexy - Base Units | IG 014
