Storno CQM6000 H-Bus RIB

Page Updated 7 Jan 2005

Discuss CQM6000 H-Bus

The Stornophone 6000 provided great flexibility for connecting external devices to the radio and the standard interface for control heads, external codeplugs, programming and test devices etc. was known as the H-Bus.

In order to allow programming of the CQM6000 from a standard PC it was necessary to provide an interface between the serial port of the PC and the H-Bus of the radio. This function was provided by either the PATSI (Programming And Test Service Instrument) or a standalone RIB (Radio Interface Box). There were various forms of the RIB ranging from the original fully featured dual-port H-RIB box, through the SI6000-7728/00 most often used for MPT trunked mobiles, to the mini-RIB allegedly built into a 25 way D-adaptor.

Home Brew H-Bus RIB

Original Storno H-RIB boxes were not widely available and following on from a discussion in the Storno community forum, here is the prototype of a new board designed by 'stornophone' which will be of interest to anybody thinking of building their own box.

Here is a brief description of how the interface works:


	Page Updated 7 Jan 2005 Discuss CQM6000 H-Bus		CQM6000 H-Bus Interface The Stornophone 6000 provided great flexibility for connecting external devices to the radio and the standard interface for control heads, external codeplugs, programming and test devices etc. was known as the H-Bus.

			H-Bus RIB In order to allow programming of the CQM6000 from a standard PC it was necessary to provide an interface between the serial port of the PC and the H-Bus of the radio. This function was provided by either the PATSI (Programming And Test Service Instrument) or a standalone RIB (Radio Interface Box). There were various forms of the RIB ranging from the original fully featured dual-port H-RIB box, through the SI6000-7728/00 most often used for MPT trunked mobiles, to the mini-RIB allegedly built into a 25 way D-adaptor.

			Home Brew H-Bus RIB Original Storno H-RIB boxes were not widely available and following on from a discussion in the Storno community forum, here is the prototype of a new board designed by 'stornophone' which will be of interest to anybody thinking of building their own box.

	Here is a brief description of how the interface works: - When the PC wants to talk it asserts the DTR line high. This pulls the SERV REQ line high through the NPN and PNP transistors. The transistor must be able to supply about 30mA as there is a 100 ohm resistor to ground on the SERV REQ line inside the radio. - When the radio answers it pulls the DIR line low. The PC can sense the state of the DIR line on the CTS input of the COM port. When the DIR line is low four of the 3-state buffers inside the 74HC367 are enabled allowing the information present on the DATA line to flow to the computer on the RXD line of the COM port. - For the computer to reply it must assert its RTS line. This enables the other two buffers inside the 74HC367 and allows data to flow from TXD to the DATA line. Note that if the DIR line is low the RTS signal is inhibited to avoid data collisions. Download circuit below as jpeg (544k)

CQM6000 H-Bus Interface

H-Bus RIB

Home Brew H-Bus RIB