GSM T
ELEMETRY
S
YSTEM
4. Output Relays
Two relay outputs are provided, which when activated provide a ‘switch’ output as below.
250
CH1
CH2
Relay Connections when
Transmitter NOT Operating
NC
COM
NO
Relay Connections when
Transmitter OPERATING
NC
COM
NO
5. Power up
The 250 unit can be powered from 12 or 24Vdc, a mains power supply is also available.
Connecting to the 3 pin terminal block provides the 250 with power.
On power up the PWR LED will illuminate steady green.
The GSM engine takes several seconds to warm-up. The GSM LED may flash when the GSM engine is
active.
The GSM will come on after several seconds and should start to blink, indicating that the GSM modem has
registered with the network and that the unit is ready to accept user commands. The STAT LED blinks
whenever there is GSM activity, I.E. the unit is sending or receiving a text.
6. Power Loss
In the event of power loss to the 250 the unit will maintain the user configured data entered during the
User set-up sequence, as this information is stored in non-volatile memory. However the status of the
relays will be lost.
7. User Set-Up of 250
Prior to usage, it is necessary to program the 250 unit with the following parameters. (Some are optional)
Note that the User Password
is
case sensitive but the commands are
not
case sensitive and will be converted into
upper case before the unit handles them. This means that any user command responses, which echo the original
command will do so in upper case.
All commands are sent as text messages from a mobile phone.
DS250-5 Nov ’06
©2006
REG No 277 4001, ENGLAND.
Page 4
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