Sierra Wireless Airlink GX450, Hardware User'S Manual

Page: 43 / 72

Installation and Startup
Rev 4 Jan.15 43
Figure 2-26: Digital Output Operation
I/O X-Card Digital I/O Input Pins
Pins 3, 4, 11 and 12 are programmed in ACEmanager to monitor inputs, respond
to certain types of events or trigger a digital output. They behave exactly like the
Digital I/O (pin 4) on the power connector as described in
Connecting a DC Power
Cable on page 34.
Note: Digital Input 1 in ACEmanager is reserved for Pin 4 on the power connector.
Pins 3, 4, 11 and 12 (Digital inputs 2 to 5) have a voltage of 3.3 VDC when set to
high in ACEmanager. A voltage on the pins of:
• 2.2 VDC to 30 VDC = logic 1
• 0 VDC to 1.3 VDC= logic 0
2.8 V
51 k

internal
pull up
Voltage supply
CL+
CL-
COM
NC
NO
I/O Circuit
Pins 3, 4, 11, and 12 are normally at 2.8 V,
External Relay Circuit
(Exact voltages and configuration
depend on the actual system design.)
AirLink GX device
Flyback diode
but pulled low when activated
Table 2-6: Digital I/O
Pins Name Specification Min Typical Max Units
3
4
11
12 DIO[2...5]
(as input) Input low state voltage
(At or below this voltage, relay reads as low) — — 1.2 V
Input high state voltage range
(At or above this voltage, relay reads as high) 2.2 — — V
Input leakage current at 5 V — 0.05 — mA
Input leakage current at 12 V — 1.8 — mA
Input leakage current at 24 V — 5.5 — mA
DIO[2...5]
(as output) Open drain drive to ground — 100 — mA
Maximum open circuit voltage applied — — 30 V