SD-250
User Guide
Page 1: ...SD 250 User Guide...
Page 2: ...ternal Connections 6 Pin Outs 7 Operation Channel Selection 9 Transmit Receive Operation 10 Serial Commands 10 Status Indicators 12 Programming 13 Installation Antennas 14 Power sources 14 Cabling 15...
Page 3: ...times The SD250 RF data module must only be installed where unintentional contact cannot be made The surface of the device may be hot to touch under certain transmit conditions The SD250 is not desig...
Page 4: ...ing for use Unpacking and inspection Unpack the modem and check that you have received the following items SD250 RF data module User Guide this document If any of these items are missing please contac...
Page 5: ...The SD250 can also be fitted with below a few different modems Bell 202 V 23 modem 1200 baud rate FFSK modem 4800 baud rate GMSK modem 9600 baud rate The internal modem allows communication with a pc...
Page 6: ...rogrammable output power Synthesized operation with 16 channel capability SAT when used with Bell 202 V 23 and FFSK modem or speech Programmable 12 5 25kHz channel spacing External modem Direct FM Int...
Page 7: ...Rev 0B 6 External Connections 1 HD 9 way d type data control signals and power supply 2 BNC antenna connector...
Page 8: ...at 60 peak system deviation input level 100 to 120mVrms Direct FM TTL level 1 RS 232 data IN Input to Bell 202 V23 FFSK GMSK modem Link 409 not fitted and link412 fitted RS 232 level option 12V Tx 12...
Page 9: ...option modem board is installed a resistor link can select RS 232 signal levels See Modem manual TTL level 0V carrier 5V no carrier RS 232 level option 12V carrier 12V no carrier O P 7 Microphone fil...
Page 10: ...aken to avoid any damage which could invalidate the warranty The channel can also be changed by a serial command inputted from the external control system 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3...
Page 11: ...ed need to be RS232 and a resistor link needs to be incorporated in the correct position to allow correct operation see modem manual The TX serial command see later for further details can also put th...
Page 12: ...est data 0x79 Disable test data 0x75 0x78 0x75 0x79 GMSK 0x7a 0x00 Disable 0x01 Enable 0x7a 0x00 0x7a 0x01 0x7c 0x00 Disable 0x01 Enable Mark data 0x7c 0x00 0x7c 0x01 4 Modem alignment mode FFSK AFSK...
Page 13: ...ED flashes Scan Delete One Red flash SCANNING Scan All Delete Two Red flashes Busy Channel lockout Two Green flashes Single Beep Tone Time out Time One Green flash Before 5S T O T One Green flash Sing...
Page 14: ...spacing and sub audible tones on a per channel basis Standard radio settings such as power save mode scan tx lockout tx timeout Squelch enable Modem options when the Bell 202 V 23 FFSK GMSK is fitted...
Page 15: ...retaining a good ground plane for each antenna Therefore for a 400MHz system the ideal separation should be a minimum of 0 75m and for 150MHz system the minimum should be 2 5m Warning If installing an...
Page 16: ...uting of all cabling such that the insulation cannot become damaged Fixing We recommend that the SD250 is securely fixed to a surface either directly or with a suitable bracket The fixing hole center...
Page 17: ...evant international standards Where prolonged human exposure is likely the minimum separation from the antenna should be 0 8m Electromagnetic interference compatibility Most modern electronic equipmen...
Page 18: ...as Do not remove install or charge batteries in such areas Sparks in potentially explosive atmospheres can cause an explosion or fire resulting in bodily injury or death Potentially explosive atmosphe...
Page 19: ...on or repair may cause irreparable damage to your unit and will invalidate any warranty Care of the equipment Do not immerse the SD250 RF data module in water or other fluids Do not use solvents or sp...
Page 20: ...ct the Technical Services Group Leader at the above address Information provided in this document is believed correct at time of printing but is subject to change without notice Midland Radio will not...
