Siemens ISGS SG8158-00 - Manual (Page 14)

Installation
8 Siemens Energy & Automation, Inc.
2.5 Communications
The ISGS relay must be connected to a host computer in
order for it to communicate with other devices. The relay
supports both RS-232 and RS-485 (optional) data inter-
faces. The use of either of these data interfaces will allow the
same level of access to the system as the front panel key-
pad, but configuration through communications does not
require a password.
The next section describes the connection to the interfaces.
For more information about operating the ISGS relay via the
data interfaces, refer to the documentation for the communi-
cations software, such as WinPM™ or Wisdom. Keypad
operations are described in Chapter 3.
2.5.1 PC Communications (RS-232)
The RS-232 interface (front port) is intended only for short-
term connections to a portable computer. Use this interface
to perform initial setup or to read the ISGS relay data logs or
waveform buffers using an appropriate software program. To
connect your PC to the front port, follow these instructions:
1. Remove the relay case front cover.
2. Locate the RS-232 connector on the front panel of the
cradle assembly.
3. Connect the PC to the front panel RS-232 port using a
standard DB-9 serial port connection cable (DB-9 male
to DB-9 female or DB-25 female depending on the type
of port on the computer). This connection does not
require the use of special adapters or a null-modem
cable.
2.5.2 Network Communications (RS-485)
The optional RS-485 interface (rear port) allows remote com-
munication over a shielded twisted pair wire at distances of
up to 4000 feet. Use this interface together with an appropri-
ate software program for remote monitoring and control of
the ISGS relay.
To connect the ISGS relay to your communications system,
follow these instructions:
1. Locate the RS-485 connector on the rear of the M1
case.
2. Use shielded twisted pair wire to connect pins 48, 49,
and 50 to your electrical distribution system.
To connect the ISGS relay to your PC via the rear port
• directly, use an RS-232 to RS-485 converter.
• via modem, use an RS-232 to RS-485 converter and a
null modem.
2.6 Cradle Assembly
Some of the setup and maintenance procedures in this man-
ual require removal of the relay cradle assembly from the
drawout case. Use the following instructions for the proper
removal and insertion of the cradle assembly.
IMPORTANT:
The relay module contains CMOS circuits. Electro-
static discharges into or around the relay cradle or
any of its components must be avoided. Use
grounding straps or touch a grounded metal sur-
face before handling the relay cradle.
2.6.1 Removing
Use the following procedure to remove the cradle assembly
from the case:
1. Remove the relay case front cover.
2. Remove the top and bottom connecting plugs
(paddles).
3. Loosen the cradle assembly by pulling the top release
lever to the left and the bottom release lever to the right
until the assembly ejects from the case.
4. Grasp the cradle assembly by the edges of the front
panel and pull it out of the drawout case.
5. Place the cradle assembly on an anti-electrostatic sur-
face and perform the desired work.
2.6.2 Inserting
Use the following procedure to insert the cradle assembly
into the drawout case:
1. Insert the cradle assembly until the release levers come
in contact with the protrusions on the case.
2. Position the top and bottom release levers until the slots
on the levers align with the protrusions on the case.
3. Use the release levers to finish inserting the cradle
assembly into the case. Apply pressure to the cradle
assembly front panel until the assembly fully seats in the
case.
4. Insert the top and bottom paddles.
5. Check for proper insertion of the cradle assembly by
seeing if the expected measured values are observed on
the relay display.
6. Install the front cover.
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