SMA WB 5000 Installation - Manual (Page 38)

Communication SMA Technology AG
Page 38 WB50_60-11:SE4005 Installation Guide
7.2 RS232 communication
RS232 is a communication standard for communicating with a single Windy Boy over
a maximum distance of 15 m. For RS232 communication, the following conditions
must be satisfied:
• The Sunny Boy 3800 must be equipped with a cable feed-through on the lower
side of the enclosure, between the DC inputs and the opening for the AC cables.
• The Sunny Boy 3800 must be equipped with an RS232 Piggy-Back.
• A completely shielded cable with a minimum of three conductors, e.g. LiYCY,
0.25 mm², and a maximum length of 15 m must be used.
The Sunny Boy 3800 can be retrofitted for RS232 communication. The SMA order
code for RS232 is "232PB-NR“. When upgrading with an RS232 interface, the feed-
through provided must be installed in the Sunny Boy 3800, next to the mains cable
feed-through. The cable to be fed into the Sunny Boy 3800 is clamped using the
screw terminals on the communications connector of the Sunny Boy 3800 (see
chapter 3.1 "Unit description” (page 13)) and the other end is connected to a serial
interface on a PC in the usual manner. The pin connections for a normal PC
connections are shown in the following table:
Terminal Signal D-SUB 9 plug D-SUB 25 plug
Case Shielding Case Case
2
RxD (Windy Boy
output)
2 3
3 TxD (Windy Boy input) 3 2
5 GND 5 7