Addressing for a multipoint communication system for patient mon

Details Addressing for a multipoint communication system for patient mon Addressing for a multipoint communication system for patient mon

1984-11-08

1987-01-20

Weldon, Ulysses

Communications: electrical

Continuously variable indicating

With meter reading

34082506, 34082508, 34082553, H04Q 100

Patent

active

046383131

ABSTRACT:
A method for dynamically assigning addresses to new modules as they are coupled to a communication system with a synchronous data link control (SDLC) bus is described. These modules communicate with a display unit via the SDLC bus. The SDLC bus is controlled by a primary station in the display unit, with all modules acting as secondary stations. The primary station periodically broadcasts a time-tag to all modules at a thirty-two hertz rate. At power up, each module obtains a number, module 16, derived from the lower four bits of its unique twenty-four bit serial number. The module uses this number as a count of the number of time-tags which must occur before the module responds to the primary with an address request. If there are no collisions with other modules, the primary sends the module a packet which assigns the module the next available address. In the event of a collision (i.e., two or more modules request an address at the same time), the primary SDLC controller detects a CRC error and ignores the SDLC frame. The modules will each time-out and obtain a new number, modulo 16, derived from the next significant four bits of the module serial number. This process continues until the module obtains an address.

REFERENCES:
patent: 4149144 (1979-04-01), Diefenderfer
patent: 4506360 (1985-03-01), Kryskow, Jr. et al.
patent: 4510596 (1985-04-01), Hartmann et al.
patent: 4530045 (1985-07-01), Petroff
IBM publication GA27-3093-2, File No. Genl-90, 1979.

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