Cloud-electronics DCM1 Manual de usuario descargar pdf (Pagina 68)

DCM1 & DCM1e Installation and User Guide v1.068

The Congure Access Connector menu function permits

a slightly restricted set of I/O congurations of the eight pins:

inputs and outputs must be in consecutive “blocks”, e.g., pins

1 to 4 may be inputs with pins 5 to 8 as outputs. However,

using serial commands allows any combination of inputs and

outputs (up to a total of eight) to be set up. Examples are

given below.

Inputs:

In Input mode, the logic level present at a pin will be evaluated

as “high” (>2.55 V) or “low” (<0.75 V), and logic “active” =

“low”. The most common use of the GPIO port in Input

mode is to connect a pin to an external SPST push-button or

other type of N/O switch, with 0 V being applied to the other

contact. In Input mode, the pins are pulled-up internally to

+12 V, so an external switch closure will register as a low level

on interrogation, and this is interpreted as “active”.

Outputs:

In Output mode, the pins may be assigned to be “high”

(nominally +12 V) or low (nominally 0 V). External equipment

requiring a logic input may be connected to output pins,

provided the inputs are rated at not more than 24 V and do

not draw more than 60 mA.

Using Serial commands with the GPIO port:

RS-232 serial commands via either the RS232 INTERFACE

(DCM1 or DCM1e) or ETHERNET INTERFACE

(DCM1e only) may be used to set the conguration of the

PAGING ACCESS connector.

GENERAL FORMAT

FUNCTION COMMAND (ASCII)

Congure Connector for paging

<PM,x/>

Congure Connector as GPIO port

<SY.AC,Dxm/>

Set GPO(s) active

<SY.AC,BSy/>

Clear all GPOs

<SY.AC,BPy/>

The results of these commands broadly correspond to the

options provided by the Congure Access Connector

menu function: the connector can be set for use with a paging

system, either as an input (Paging Zone Select) or output

(zone tallies), or as a GPIO port.

1. Congure for use with Paging mics

The value of x in the general format command <PM,x/> is

either ASCII “I” or “O”, conguring the connector for paging

zone selection or as a set of eight zone tallies respectively.

2. Congure as GPIO port

The value of x in the general format command

<SY.AC,Dxm/> is again either ASCII “I” or “O”, with m

dening a number of pins on the connector to be GPI(s) or

GPO(s) respectively (where 1 ≤ m ≤ 8). In this mode, note

that pins set as inputs will always form a consecutive block

numbered ‘up’ from pin 1; likewise pins set as outputs will

always form a consecutive block numbered ‘down’ from pin

8. Thus in the third example below, pins 1 to 3 will be set

as GPIs, while pins 4 to 8 will remain as GPOs. A command

setting a pin to the same I/O state as its current state will

have no effect.

3. Set GPOs active

Once pins have been dened as outputs in GPIO mode, each

may be set “active” or reset “inactive” at will, using the general

format command <SY.AC,BSy/>. Here, y is an 8-bit string

consisting of either ASCII “X”s or “O”s. An “X” will set an

output “active”, and its in-string position refers to the the pin

number, as shown in fourth example below.

EXAMPLE COMMAND

Congure

Access

Connector for

paging zone

selection

ASCII

<PM,O/>

HEX 3C 50 4D 2C 4F 2F 3E

Congure

Access

Connector as

zone tallies

ASCII

<PM,I/>

HEX 3C 50 4D 2C 49 2F 3E

Congure

Access

Connector

as GPIO port

with 3 inputs

ASCII

<SY.AC,DI3/>

HEX 3C 53 59 2E 41 43 2C 44 49 33 2F 3E

Congure

Access

Connector

as GPIO port

with 3 outputs

ASCII

<SY.AC,DO3/>

HEX 3C 53 59 2E 41 43 2C 44 4F 33 2F 3E

Set GPO 3

(pin 3) as

active

ASCII

<SY.AC,BSOOXOOOOO/>

HEX

3C 53 59 2E 41 43 2C 41 53 51 51 58

51 51 51 51 51 2F 3E

Clear all

outputs

ASCII

<SY.AC,BPXXXXXXXX/>

HEX

3C 53 59 2E 41 43 2C 41 50 58 58 58

58 58 58 58 58 2F 3E

1 2 ... 63 64 65 66 67 68 69 70 71 72 73 ... 78 79

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