User Manual

Landis+Gyr Chapter 1 - Product Overview
Gridstream SCADA/DA S4SBR 98-1138 Rev AD 9
Pin 5 (ANALOG_IN1) and Pin 10 (ANALOG_IN2)
These pins are analog inputs to the device. Voltages must be scaled to the 0 to 2.5 VDC range. The
Gridstream S4SBR returns the DC voltage as HEX values in the memory locations as described in
“Analog Input Functionality” on page 31.
To obtain the HEX values, a DCW must be developed to read and send the HEX values to the host
computer. Once the host has the HEX values, the corresponding voltage can be derived using the
following formula:
• Voltage = (Decimal value/1023) * 2.5
The DCW that reads the memory location returns a HEX value, within range of 0x0 - 0x03FF. The
user can convert to decimal using the formula obtaining the value in VDC. The table below shows
examples of various voltages and the equivalent HEX values.
 NOTE: If desired, the Analog I/O pins may be configured as Digital I/O pins or, alternatively, as
General Purpose I/O pins.
Pins 6 and 7 (GND)
These pins are the ground connection for both power and communications. These two pins are tied
together on the device.
Pin 8 (LOW_RF_POWER)
The purpose for this pin is to reduce the RF output power level to assure operation during
development and OEM manufacturing process. A logic high on this pin leaves the device in its
normal mode of operation, functioning with full rated RF transmitter power. This pin may also be
left unconnected and would therefore result in normal mode operation due to onboard pull-up.
Table 1 - 5. Example Hex Values and Equivalent Voltages
Example HEX Read Corresponding Actual Voltage
0000 0.00
0006 0.01
006B 0.25
0119 0.68
0253 1.44
0382 2.19
039F 2.26
03C7 2.36
03F1 2.46
03FD 2.49
draft 29 Jan 2013