Software Owner's manual

Chapter 3
Installation
3–3
Figure 3.1
Connection to a Single Powermonitor via RS–232C
Important: Note cable
pin–out numbers
RS–232C
Port
IBM PC (DTE)
RS232C Cable
3
2
7
TXD RXD SG
NOTES:
1. RS–232C Cables: 25 pin DB25 or 9 pin DB9, plug (male) or socket (female) depending on mating connector at computer serial port,
50 feet maximum length.
2. If connected directly to data communications equipment (DCE), the Tx and Rx leads need to be reversed at the RS–232C port .
3. A Request To Send signal is required when a modem or a Catalog Number 1400–CC Converter is being used. Connect to Terminal 4 of
the Powermonitor for the RTS signal.
Bulletin 1400
Powermonitor
SHIELD
25 Pin (9 Pin)
(2)
(3)
(5)
1 (Case Ground)
This section provides the information necessary to connect the computer
running Powermonitor Software to multiple Powermonitors via an RS–485
communications link.
An RS–485 communications link permits many Powermonitors to be
networked together on a two–wire twisted–pair local area network or LAN.
The computer can access information from any one of and up to 32 devices
connected to the RS–485 LAN.
To implement an RS–485 communications link, the computer running the
Powermonitor Software must be equipped with either an internal RS–485
communications card or an RS–232C serial port and an external RS–232C to
RS–485 converter. The Catalog Number 1400–CC converter can be used for
this purpose. Each Powermonitor to be connected to the RS–485 LAN must
be equipped with a Catalog Number 1400–DCU communications card
configured for RS–485. The communications cable required to connect the
computer to each of the Powermonitors consists of a shielded two conductor
twisted pair cable.
!
ATTENTION: Before connecting any communications cables,
confirm that every Powermonitor is equipped with a RS–485
communications port, and the port has been configured for
RS–485 operation. Refer to Publication 1400–800, ‘‘Bulletin
1400 Powermonitor Installation and Operation Manual,” for the
device to determine correct configuration of the port.
Connection To Multiple
Powermonitors Via RS–485