Satec C191HM Installation And Operation Manual page 25

POWERMETER
Figure 2-15 RS-232 Simple 3-Wire Computer Connection, 9-pin
C192PF8 POWER FACTOR CONTRO LLERS
RS-485
#1
13
14
15
#2
13
14
15
#32
13
14
15
Figure 2-16 RS-485 Multi-drop Computer Connection
NOTE:
Where an RS-232/RS-485 converter is used on a computer connection, R1 is not
applicable since it is built in to the converter.
Activity on the communications port lines is indicated via the TXD and RXD
LEDs, on the front panel and via the Status Information menu (see Chapter 6).
A full description of the communication protocols may be found in the C191HM
ASCII, Modbus and DNP3.0 Communications Manuals provided with your
16
9-PIN DB9 FEMALE CONNECTOR
RS-232
SG GND
15
TxD RxD
13
RxD TxD
14
DSR
DTR
RTS
CTS
Shi eld
+
R1
-
Sh ield
+
-
R1, R2 = 200-500 Ohm,
Shield
+
R2
-
5
2
IBM PC/COMPATIBLE
3
6
4
7
8
c99-11015
IBM PC /COMPATIBLE
or RS-2 32/RS-485 CONVERTER
RxD
TxD
RxD-
TxD-
0.5W
c99-09035
Chapter 2 Installation