User's Manual
Arctic GPRS Gateway
Firmware Version 5.0.7
43
Document Version 1.6
6 I/O Interface (optional)
This chapter describes the hardware and related software (for interface
extensions).
There is one type of I/O board:
IO-8-2
8 general purpose digital inputs, 2 digital outputs
6.1
Digital Input (IO-8-2)
For general purpose, digital I/O interfacing the Arctic includes eight digital
inputs which all share a common reference pin. The inputs are optically
isolated and work with AC voltage levels from 5 to 60 V and this range is
guaranteed to be interpreted as a logical high state. AC voltage levels less
than 2 V are interpreted as a logical low state. The schematic of one digital
input is shown in the figure 26.
Figure 30. Schematic Digital Input
In the figure INPUT refers to one of the eight Digital Input n -pins and
IN_COMMON refers to Digital Input Common -pin in the I/O connector’s pin
description is shown in Table 6.
Table 7: I/O connector’s pin description
Pin #
8-2 model (default)
1
DC out
2
Digital input 1
3
Digital input 2
4
Digital input 3
5
Digital input 4
6
Digital input 5
7
Digital input 6
8
Digital input 7
9
Digital input 8
10
Digital input common
11
Digital output 1A
12
Digital output 1B
13
Digital output 2A
14
Digital output 2B
