Introduction10
Digital Read12
Analog Report
13
Digital Report
14
Module Status
15
RCM Read
19
RMSC Read byte Analog Read (CIU04 only byte Analog Report (CIU04 only)
Serial Based InterfaceThis interface runs using a serial connection to the Bailey Infi90 network.
Server class machines often have inferior serial ports. Server class machines are not required for most interfaces and should not be used, especially not when serial port connections are required Recent Dell server class machines are using only 3 volt power supplies to drive the serial port – IEEE RS specification requires at least +/- 4.7 volts fora valid RS signal Some recent model HP and Dell server class machines have been observed to have serial port circuitry which overheat and experience thermal shutdown after a few minutes or hours of operation overlong cables or high speeds.
So called self-powered serial port extenders should not be used for interfaces. Customers often attempt to extend serial port ranges using twisted pair wire devices or fiber optic cable devices. Devices with their own external power source (e.g. a wall wart transformer or other power source) should be the only types used. Devices which leech power from the PC’s serial port will have difficulty at high data speeds (baud rates) or long cables. In some applications a cable more than 20-50 feet long maybe considered long. Higher speeds and/or longer cables translate to sharply increased power supply demand by the serial port hardware.
