User Manual

98-2550 Rev AE
16
Gridstream SCADA/DA S5SBR
Quick Start Guide Landis+Gyr
1.11 Pin 12 (TPP RX) and Pin 13 (TPP TX)
These pins are used to interface with the device's Transparent Port. These pins are driven at TTL
supply level.
Baud rates on this port default to 9,600 bps but, using RadioShop, are configurable to
115.2Kbps.
To reduce chances of electrical damage, a 1Kohm series resistor is placed in-series with the pin
which limits the drive current capability of this pin.
Stray physical capacitance on this circuit should be kept below 250[pF].
NOTE: These pins should NOT be directly connected to an RS-232 interface on a computer.
Where such a connection is necessary, the developer must purchase a TTL to RS-32 VDC
converter which is powered external and NOT via the pins or the RS-232 connection on the
computer.
1.12 Antennas
As with any RF device, antenna-related decisions are critical and must be made early. The RF
range of the final product will depend greatly on the choice of antenna and where it is placed.
50-ohm U.FL connector to SMA female cable, for RF co-axes connection to an external antenna.
1.13 External Antenna
An external antenna is connected to the board via an U.FL coaxial SMA female RF cable.
This cable is provided in order to mate to a Coax cable made to specification to fit location of
antenna.
See Figure A - 3. RF Coaxial Cable
The external antenna used to qualify the board is an omnidirectional 5 dBi whip (shown in the
next figure), made by Manufacturers Marketing Group (MMG). The MMG part number for this
antenna is 16-1000-0. MMG contact information is on page 35. This antenna can be used, or any
other omnidirectional whip antenna with 5 dBi gain or less.
Figure 1 - 7. Whip Antenna with N-type Male Reverse-Polarity Connector
NOTE: See “External Antenna Specifications’ on page for antenna technical specifications.