Appendix G. Revision History .................................................................................. 85

PI Interface for Bailey Infi90
1
Chapter 1.
Introduction
The PI Interface for Bailey Infi90 (hereafter referred to as BaInfi90 interface) transfers data between the PI System and a Bailey Network or a Bailey Infi90 distributed control system. The interface runs on the Windows Systems listed in section Supported Operating Systems
Unless otherwise noted, the remainder of this document uses the term "Windows" to refer to all these. An RS-232C serial cable provides the physical connection between the Windows computer running the BaInfi90 interface and the Bailey control system. On the Windows side, the serial cable plugs into one of the standard COM ports. On the Bailey end, the serial cable is attached to a Network Computer Interface Unit (CIU) or the Infi90 ICI. Communications across the serial line occurs byway of a binary protocol. This protocol is defined in the Bailey publication Computer Interface Unit Programmer's Reference Manual
(E93-905). This protocol is based on exception reporting. That is, the CIU or ICI sends a value to the BaInfi90 interface only when the value has met exception specifications. The communication parameters are 1200, 2400, 4800, 9600 orbits per second, 8 bits,
1 stop bit, and no parity. The interface supports both the enhanced (CIU02, CIU03, CIU04) and CIU01 versions of the computer interface module as well as the serial version of the
ICI01. For the enhanced CIU, the interface supports exception report screening. The ICI01 is compatible with the CIU04. Unless otherwise noted, the remainder of this document refers to the CIU and ICI computer gateways interchangeably. The interface supports bidirectional data transfer. That is, the interface supports reading values from the Bailey control system into the PI Server, that is, inputs, as well as sending a value from the PI Server to the Bailey control system, outputs. The interface sends an output whenever the PI source point receives anew snapshot value. The interface supports a failover configuration whereby a Primary copy of the interface collects data and a Secondary copy stands by in case primary data collection fails.
Note: The value of [PIHOME] variable for the bit interface will depend on whether the interface is being installed on a bit operating system (C:\Program Files\PIPC) or a bit operating system (C:\Program Files (x86)\PIPC). The value of [PIHOME64] variable fora bit interface will be C:\Program Files\PIPC on the bit operating system. In this documentation [PIHOME] will be used to represent the value for either [PIHOME] or [PIHOME64]. The value of [PIHOME] is the directory which is the common location for PI client applications.

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