Title:
【発明の名称】フィールドバスシステムにおける通信装置
Document Type and Number:
Japanese Patent JP2911748
Kind Code:
B2
Abstract:
A Manchester code signal is used as a communication signal to be superimposed onto an operating current. The amplitude value in the plus direction with respect to an average current value is made larger than that in the minus direction, and the time width of an "H" level in one bit time is made smaller than that of an "L" level so as to establish the average current value into a low level. Accordingly, it is possible to make the average current value at the time of not-communication equal to that at the time of communication, and it is also possible to establish the average current value to a low level.
Inventors:
KOGURE MAKOTO
Application Number:
JP11801894A
Publication Date:
June 23, 1999
Filing Date:
May 31, 1994
Export Citation:
Assignee:
HITACHI SEISAKUSHO KK
International Classes:
H03M5/12; H04B3/50; H04B3/54; H04L25/48; G08C15/06; H04L25/49; (IPC1-7): H04B3/50; G08C15/06; H03M5/12
Domestic Patent References:
| JP645967A | ||||
| JP4294635A | ||||
| JP730468A |
Other References:
小暮誠，“特集 流量計装からみたフィールドの将来とフィールドバス 標準フィールドバスの実用化と展望”，計装１９９２年３月号，Ｖｏｌ．３５，Ｎｏ．３（１９９２．３．１）Ｐ．４６−４９
Attorney, Agent or Firm:
Kasuga