Revised May 1, 2019
Revision 25 of DOCU225, © Copyright
Page 42 of 44
5 About WITS Port Pin-Outs
This section contains pin-outs to guide you as you design a product interface that is
compatible with the Pason system. Consult the information below if you are connecting a
third-party device that uses RS232 or RS422 communications.
5.1 RS232 Port Pin-Outs
Pason provides two communications boxes for use by third parties interested in setting
up WITS communications between an RS232 device and the EDR system: COMM022
and COMM018. Both of these comm boxes convert RS232 to RS422, which the EDR
can accept.
COMM022 RS232 Pin-Outs
COMM022 provides a DB9 connector on the third-party side. The table below lists pins
and descriptions for the COMM022 pin-outs:
DB9 Pin
Description
2
TX
3
RX
5
GND
all other pins
unused
Figure 17: COMM022 RS232 pin-outs
3
5
2