Rice Lake iQUBE2 Digital Diagnostic Junction Box - Manual (Page 15)

Installation 11
2.6 Digital I/O
Each iQUBE 2 board provides four channels of digital I/O.
Digital inputs can be set to provide many indicator functions, including four keys ( Zero , Tare , Units , Mode ) plus cell
health, and setpoints (see Table 5-10 on page 45 for a complete listing). The four digital inputs/outputs on the pri-
mary CPU are configurable; any secondary CPU board’s I/O will be used for cell health only.
The fastest I/O reaction times are achieved when the iQUBE 2 controls its own free-running setpoints using its own
local I/O (2 milliseconds). If preacts are required, the 920i should be used as the controller for its own I/O.
RLWS does not recommend the use of iQUBE 2 (local) I/O with 920i controlled setpoints using the preact functions
as variances in the reaction time in serially controlled I/O can dramatically affect the preact algorithm.
Cell Health
The iQUBE 2 CPU board provides bi-color cell status LEDs next to each load cell connector. These LEDs indicate
the status of connected load cells.
Digital inputs are active low (0 VDC), inactive high (5 VDC). Digital I/O are active/low if the CPU board’s LED
color is green.
Digital outputs are typically used to control relays that drive other equipment. Outputs are designed to sink, rather
than source, switching current.
Each output is a normally open collector circuit, capable of sinking 25 mA when active. Digital outputs are wired
to switch relays when the digital output is active (low, 0 VDC) with reference to a 5 VDC supply.
Table 2-10 shows the pin assignments for connector J5.
Data Rate Approx. Range
54 Mbps 65 feet
48 Mbps 80 feet
36 Mbps 115 feet
24 Mbps 140 feet
18 Mbps 170 feet
11 Mbps 180 feet
9 Mbps 190 feet
5.5 Mbps 215 feet
3 Mbps 260 feet
1 Mbps 330 feet
Table 2-8. Approximate 802.11g data rate/range
LED Color Meaning
Green Load cell is good
Red Load cell error
Red/Green
Flashing
Consistent error being cleared by host
Off Disabled/load cell not assigned to a scale
Table 2-9. LED Status Indications