Rice Lake IQ 700 Configurable Weight Indicator - Manual (Page 27)

Options Configuration 23
4.2 Option 2 – Analog Output Option
Option 2 enables the analog output option. The following features of analog output are:
• Converts serial data into analog: 0–10 VDC or 4–20 mA.
• Ordered as a kit, it must be operated remotely from the digital weight indicator.
• Self powered, 115/230 VAC provides isolated output.
• Automatic data checking/verification.
• Analog output tracks gross, net, or displayed weight.
• Full digital calibration (indicator front panel).
Serial data from the indicator is modified to include scaled information specifically for the analog output module.
The standard communications are also included to allow the module to pass-through printer or scoreboard
information.
NOTE: The serial pass-through does not have duplex capability.
The analog output is fully isolated with its own power supply and current loop communications. The analog module
can be located remotely up to 1000 feet from the indicator. After wiring and setting the module’s baud rate, the
remaining setup and calibration is done at the indicator.
4.2.1 Specifications
Current output is 4–20 mA with a maximum impedance less than or equal to 600 Ω.
Voltage output is 0–10 VDC with a minimum load resistance of 1k Ω.
4.2.2 Test Modes
Switch settings are provided to force the analog output to zero, full scale, or to provide a continuous sawtooth
waveform for system checking.
4.2.3 Error Checking
Serial data is continually checked for parity, valid characters, and presence of communication. Loss of data is
indicated by forcing the analog output to a minimum value of 0.5 VDC or 3.2 mA (approximate). If the indicator is
in an overload condition, the analog output is forced to 5% over full scale. With the 4–20 mA output, an additional
alarm is provided to detect the lack of current (break) in the loop.
4.2.4 Communication Verification
An LED (DS1) is provided on the analog module:
• ON = Communications OK
• Pulse = Communications errors
• OFF = No power