Midian CAD-POCSAG, CAD-POCSAGU User Manual

CAD-POCSAG

PC BASED POCSAG ENCODER (Serial DB9 Version)

CAD-POCSAGU

PC BASED POCSAG ENCODER (USB Version)

Manual Revision: 2012-05-09

Covers Firmware Revisions:
CA

D-POCSAG: 1.0

Covers Software Revisions:
CAD-POCSAG: 2.5 & Higher

Covers Hardware Revisions:
CAD: 219F & Higher

SPECIFICATIONS

Operating Voltage 10-15 VDC
Operating Current 22 mA
NRZ Data Rate 512, 1200, & 2400
PTT Output Current 1 A
Data Output Level 0-1/2 VIN
Data Output Impedance 5 K Ohm
Dimensions 5.87 x 4 x 1.5”
Operating Temperature -30° to +60° C
Maximum Message Length 100 characters

SYSTEM REQUIREMENTS

Windows 98 Second Edition or Higher
Pentium 1 or Higher
10 MB of Disk Space
64 MB of RAM

Operating System: Windows 98 SE, 2000, XP SP2 and higher
Processor: Pentium 1 or Higher
Hard-Drive Space: Minimum 10 MB
RAM: Minimum 64 MB
Serial DB9 Version is ordered as CAD-POCSAG.
USB Version is ordered as CAD-POCSAGU.

GENERAL INFORMATION

Midian Electronics’ CAD-POCSAG enables the user to encode POCSAG pages to single or multiple pagers at
one of three baud rates (512, 1200 or 2400). Files inserted into a network folder can also be encoded by the
CAD-POCSAG.

POCSAG: POCSAG is a digital paging format used for alpha and numeric pages. POCSAG was originally
specified by the British Ministry of Posts and Telecommunications.

HARDWARE INSTALLATION

Pin 1 – Ground – Connect to ground in the base station.
Pin 2 – B+ - Connect to a 10-15 VDC source in the base station.
Pin 3 – PTT Output – Connect to the PTT input of the radio. This open collector provides a ground during PTT.

Pin 5 – Data Output – Connect to the Data Input of the radio which provides a flat frequency response.
Pin 9 – COR Input – Connect to a point in the Squelch or CTCSS circuit that changes logic level when carrier is

received. A radio whose squelch circuit provides a logic low or logic high can readily turn the COR transistor on
and off. If the point that this lead is hooked to only makes a minute change in voltage, it will be necessary to
adjust the values of the input resistors to cause the COR transistor to change states.

The USB connector is P3.
The following are the pins used on the Female DB-9 connector P2 (RS-232).

P2-2 – TX Output
P2-3 – RX Input
P2-4 – Data Terminal Ready
P2-5 – Ground
P2-6 – Data Set Ready
P2-7 – Clear To Send
P2-8 – Request To Send

HARDWARE ALIGNMENT

Output Level: To set the output level, command the CAD-POCSAG to send a lengthy page by typing a long

message and sending to multiple pagers. Set R78 for a deviation of ±4.5 kHz at the transmitter.

R78: Output Level

SOFTWARE INSTALLATION

Insert the CD-ROM that came with your product, which is labeled “Programming Software & Product Manual CD­ROM” into your CD drive. The CD-ROM should launch automatically. If it does not, simply navigate to the drive
letter of your CD-ROM and double-click ‘Browser.exe’. This will launch the web browser and display the home
page so that you may view the contents of the Programming Software & Product Manual CD-ROM.

1. From the main page click the link of the navigation bar titled Misc. Software.

2. After the new page appears click on the link in the main window labeled CAD Series Software.

3. This will open a page that lists all of our CAD products. Double-click on the link titled CAD-POCSAG (Page
Master) > this will automatically start the installation program.

4. Follow the installation instructions.

Modem Parameters:

PRODUCT PROGRAMMING

Baud Rate: Select the baud rate of the POCSAG pagers, either 512, 1200 or 2400 bps.
COR Polarity: This should match the active COR polarity of the radio.
Data Polarity: This polarity is dependent upon the radio and can only be determined by experimentation.
Key-Up Delay: This sets the delay from when the radio starts to transmit until the CAD-POCSAG encodes the

POCSAG sequence.

COR Delay: This sets the time that the channel must be inactive before the unit will attempt to send a page.
Transmit Hold Up: This is a length of time after the POCSAG has been encoded that the transmitter will remain

keyed.
Force Alpha/Numeric Translation: Check this box if the pagers are not capable of 7-bit and 4-bit decoding. If

checked the unit will send each message as 7-bit encoding. If unchecked it will send numeric messages as 4-bit
encoding.