User's Manual

QTI Page 6 of 15 Revision: C
Form #: 30Z0266 Effective Date: 5 October 2012
Receiving
During normal operation, the MCDR is capable of receiving SEIWG-005 messages via the serial port
and via radio frequency. The MCDR assumes a low-power shut-down mode to conserve power when
not in use.
Items Required
1. DC Power Source: 3.5VDC receiver to 16.5 Volts
2. Personal Computer with USB or RS232 port
3. 10-pin connector to RS-485 USB cable (QTI part# 10D1978)
4. Serial Communications Program such as HyperTerminal
Setup
1. Set the Channel. (Default CHR 001)
2. Enable receiver, if desired. (Default RCV 1)
3. Enable Push to send messages out serial port, or disable to poll for messages. (Default PSH 1)
RF Link
The operational range of the RF link is dependent upon various conditions. The high frequency of the
RF link works best under line of sight conditions. RF range may vary from 0.5 kilometer to 5
kilometers for open areas.
NOTE: Elevating an antenna will increase transmission and/or reception range significantly. The use
of relays/repeaters can also be used to increase transmission ranges. Transmitting and receiving
antennas should all be oriented in the same direction i.e. all mounted vertically or all mounted
horizontally so that they have the same polarization.
Section 3: FCC RF Exposure Limits
This device complies with the MPE (Maximum Permissible Exposure) requirements by providing a
safe separation distance of 30 cm between the antenna, including any radiating structure, and any
persons when normally operated.
Caution
The antenna(s) used for this transmitter must not be co-located or operating in conjunction with any
other antenna or transmitter. This device is approved with emissions having a source-based time-
averaging duty factor not exceeding 50%. Operating at a lower duty cycle than 50% will allow
proportionately shorter exposure distance than 30 cm.
Section 4: Serial Interface
The MCDR defaults to a low-power shut down mode with the receiver still operating (if installed). If
push is enabled (“PSH 1”), the MCDR will send the message via the serial port upon receiving an RF
message, and then return to shut-down immediately. The user may initiate serial communication by
sending the MCDR two carriage returns. This is to allow the MCDR time to wake-up from the power-
down mode. After 1 minute of inactivity on the serial port, the MCDR returns to low-power shut down
mode. If the user has disabled the PUSH setting (“PSH 0”) and a new RF message is received, the
MCDR will send its RS485 ID. See the SID command. This is used to wake-up the user’s application