Post Installation Signal Strength And Led Indications; Transceiver Rssi - Siemens WiPS-200 Series Installation Manual

4. Locate the Hop Key (a small circuit board) at the rear edge of the top circuit board, see the figure below.
Unplug the Hop Key and set it aside.
5. Carefully insert the faceplate/circuit board assembly in its cover until it snaps into place. When inserting the
assembly into its cover, be sure the circuit board enters the card guides in the cover and the circuit board card
edge connector mates with the connector in the cover.
6. Remove the spare transceiver's cover as described above in step 3.
7. Insert the Hop Key from the original transceiver into the spare transceiver - carefully align the Hop Key
connector with the main circuit board pins. Carefully insert the faceplate/circuit board assembly in the enclosure
– review step 5 as needed to ensure correct orientation.
8. Label the spare transceiver with the Hop Key 5-digit ID number and suffix (M for master, S for remote).
9. If replacing the original transceiver, mount the spare transceiver on the DIN rail and complete all needed
connections. Otherwise install the original transceiver and complete all needed connections.
10. Remove the anti-static wrist strap from your wrist.
When power is applied to the "spare" transceiver, it will memorize Hop Key data - allow a few seconds after power
up for the data to transfer to transceiver memory.

POST INSTALLATION SIGNAL STRENGTH AND LED INDICATIONS

This section describes a method for determining whether received signal strength is adequate. It also provides status
LED indications that will help to assess whether the wireless network is operating properly.
There are no user serviceable parts within a transmitter or receiver. Should service be needed, see the Product
Support section to contact Siemens.

TRANSCEIVER RSSI

RSSI (Received Signal Strength Indicator) is measured using a DC voltmeter between the provided test point and
power supply ground. The test point is accessed by inserting a positive meter probe into the RSSI receptacle on the
face of the transceiver module and connecting the negative meter probe to the module's Ground terminal.
The RSSI graph in Figure 21 can be used to test the received signal strength. Ideally, the meter reading should be 2.5
Vdc or more. This represents a 90 dB signal loss and typically indicates that the transceiver has 20 dB fade margin
left until loss of link. It is recommended that a transceiver be set up with no less than a 20 dB margin.
May 2007
IGWiPS200-1
Hop Key
Location
29