Siemens 9700, Installation Instructions Manual, Page: 32 / 45

32:(50(7(5,167$//$7,21$1'%$6,&6(783
Communications Connections
The 9700 Power Meter basic model includes one selectable RS-232/RS-485
port capable of baud rates up to 19,200 bps.
The optional X
PRESS
C
ARD
provides 2 additional RS-485 ports, capable of
baud rates up to 115,200 bps, as well as one 10Base-T Ethernet port capable
of baud rates up to 10Mbps. The X
PRESS
C
ARD
can also be ordered with a
10Base-FL Ethernet port (10Mbps). If the X
PRESS
C
ARD
is ordered separately,
refer to the X
PRESS
Card Installation & Basic Setup Instructions supplied
with the card.
RS-232 Connections
The 9700 Power Meter’s communications card includes optical coupling
that provides full isolation between the RS-232 communication lines and the
9700 Power Meter internal circuitry. This circuitry provides protection from
common mode voltages and incorrect connection. All inputs pass the
ANSI/IEEE C37.90-1989 surge withstand and fast transient tests.
Specification Value
Baud Rates 300 to 19, 200 bps
Duplex Full
Supported
Protocols SEABus, Modbus RTU, GPS:TRUETIME/DATUM, GPS:ARBITER
Isolation Optical isolation from all other inputs and outputs (excluding the
COM 1 RS-485 port); isolation voltage is 750 V peak for 10 seconds
@ 60 Hz.
Serial Cable Wiring Connections
RS-232 connections are made at COM 1 via captured-wire terminal strips on
the 9700 Power Meter adjacent to the phase and power supply connections
(refer to the diagram on page 1). Terminal connections are marked as
follows:
Marking Terminal Function
RXD RS-232 Receive Data (i.e. data into device)
TXD RS-232 Transmit Data (i.e. data out of device)
SG RS-232 Signal Ground (isolated)
RTS RS-232 Request To Send
CTS RS-232 Clear To Send
2
38)
The RS-232 and RS-485
ports at COM 1 are
multiplexed – you cannot
use both ports
simultaneously
2
38)
Use of the RTS and CTS
lines is optional. Some
types of modems (i.e. radio
modems) may require the
use of these lines