Specifications

8 In - in RX input -
9 Vin
In/Out
DC Power
DC Power in or out if unit is powered using DC in
jack.
Configuring for RS-422
To configure the FireLine modem for RS-422 operation, use the ATIO 4
command. You must order the RS-422 option for this to work, and only
FireLine modems with Revision E or higher hardware will work in RS-422
mode. The FireLine’s hardware is identical to the RS-485 version, with the
exception of two internal loop-back resistors.
Raveon’s RS-422 I/O circuit uses 3.3V logic to drive the lines, and the RS422
pins are ESD protected to ±15kV and 7kV human body model
.
RS-422 installations typically have a termination resistor across the In and the
Out lines. A value of 150 ohms should work in most applications.
Bias and Termination Resistors
FireLine RS-422 receivers have built-in bias resistors, offering the network a
true “1/8 unit load”. In most allocations, these internal bias resistors are
sufficient, and an external bias resistor is not required.
Serial out data comes out pins 3 and 7. Serial input data comes in via pins 4
and 8. Connect pin 5 to earth ground.
FireLine RS-422 receivers have built-in bias resistors, offering the network a
true “1/8 unit load”. In most allocations, these internal bias resistors are
sufficient, and an external bias resistor is not required.
4.6. Low Power Mode (LPM)
The FireLine modem (with Revision E firmware and higher) , has the ability to be put
into a low power mode (LPM). In LPM the modem draws much less current
from the DC input. In LPM, the internal radio in the FireLine is disabled, as
well as certain current-consuming hardware circuits. The ability of the
FireLine to go into LPM is set with a configuration bit, using the ATRP 1
command. ATRP 1 configures the FireLine to monitor the DTR input line, and
enter the LPM mode whenever DTR is negated. If the DTR signal is
asserted, the FireLine modem will operate normally.
The FireLine can switch between LPM and normal mode using the DTR line,
and it switches much faster than using the DC power supply. The FireLine
takes about ½ of a second to power on when DC is applied, but can switch
between normal and LPM in about 25milliseconds.
The factory default value for the ATRP setting is 0. When ATRP is a zero,
the FireLine will not ever enter the LPM mode, and the DTR input signal is
ignored.