User's Manual
QTI Page 4 of 15 Revision: D
Form #: 30Z0250 Effective Date: 1 August 2010
Current Draw Approximations:
Mode Current Comments
Sleep 20uA MCDT wakes up on RS485 bus activity
Active 5.0mA Receiver Off / Microprocessor On
Transmission(1Watt) 57ms @ 1.5A Pulse Current Provided by Super Caps
Transmission(2Watt) 57ms @ 3A Pulse Current Provided by Super Caps
Receiver On 11 to 12.6mA Receiver On – Waiting for valid RF message
Receiver Active 16.9mA RF message received – Microprocessor On
Design Features
ID Code Selection 000-999 for EMIDS, 000-063 for all other formats
Directional, sensor fault, low battery, tamper, and test status codes for EMIDS format
Able to receive and transmit MIDS 20-bit or MMIDS / EMIDS 29-bit messages
MMCX antenna port matched to 50 ohms
Conformal-coated and shielded circuit assembly
Physical Characteristics
The MCDT is light weight and comes in a compact size. This makes it ideal for mobile applications as
well as applications with tight space constraints.
Receiver Only Transmitter Only Transceiver
Weight 62 g (2.2 oz) 89 g (3.1oz) 104 g (3.7oz)
Height 1.38 cm (0.544 in) 2.36 cm (0.929 in)
Length 5.60 cm (2.206 in)
Width 5.10 cm (2.006 in)
The shielding on the MCDT has been designed in a way to promote easy PCB integration. The top of
the MCDT is equipped with three alignment tabs that can be used as standoffs. The alignment tabs are
delivered down on the transmitter and can be bent upward if needed. By utilizing these pins and a
proper connector you are able to design a board that connects to the MCDT. Dimensions for the
transmitter, transceiver and receiver MCDTs are shown in figures 1 & 2 below. The receiver MCDT
has identical dimensions except for height.
Connections to the MCDT can be made by connecting to the J2 header. The header as used on the
MCDT is SAMTEC part TFM-105-XX-X-D. The recommended mate is SFM-105-T2-L-D-P from
SAMTEC. These are 2 x 5 pin headers with a 50 mil pitch. See Connections table above to determine
pin outs.
The serial RS485 I/O driver IC used by Qual-tron is a
MAXIM part. The part number is MAX3471EUA+. If
the customer also includes this IC from MAXIM in
their design, connect pin 6 of the IC to pin 4 on J2 and
connect pin 7 to pin 5 on J2. Note: Sometimes RS485
devices are marked with the polarity reversed from
normal RS485 standards. If a new or unknown device
cannot communicate, try reversing the differential lines
usually marked A & B.