INFICON BCG450 ATM to Ultra-High Vacuum Triple Gauge - Manual (Page 38)

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This interface allows operation of BCG450-SD with part number
353-557,
353-558 and
353-562
in connection with other devices that are suited for DeviceNet operation. The
physical interface and communication firmware of BCG450-SD comply with the
DeviceNet standard (
→ [4], [6]).
Two adjustable switching functions are integrated in BCG450-SD. The corre-
sponding relay contacts are available at the sensor cable connector
(
→ 8, 20, 41).
The basic sensor and sensor electronics of all BCG450 gauges are identical.
Caution
Caution: data transmission errors
The attempt to operate the BCG450-SD with the RS232C interface
causes data transmission errors.
The BCG450-SD must not be operated with the RS232C interface.
Via this interface, the following and further data are exchanged in the standardized
DeviceNet protocol (
→ [1]):
• Pressure reading
• Pressure unit (Torr, mbar, Pa)
• Degas
function
• Status and error messages
• Status of the switching functions
As the DeviceNet protocol is highly complex, the parameters and programming of
BCG450-SD are described in detail in the separate Communication Protocol
(
→ [1]).
Before the gauge is put into operation, it has to be configured for DeviceNet op-
eration. A configuration tool and the device specific EDS file (Electronic Data
Sheet) are required for this purpose. The EDS file can be downloaded via internet
(
→ [3]).
For unambiguous identification of the gauge in a DeviceNet environment, a node
address is required. The node address setting is made on the gauge or pro-
grammed via DeviceNet.
Set the node address (0 … 63
dec
) via the "ADDRESS" "MSD"
and "LSD" switches. The node address is polled by the firmware
when the gauge is switched on. If the setting deviates from the
stored value, the new value is taken over into the NVRAM. If a
setting higher than 63 is made, the previous node address set-
ting remains valid.
Default address setting is 63
dec
.
If the „MSD“ switch is in the "P" position, the node address is
programmable via DeviceNet (
→ [1]).
4.9 DeviceNet Interface
(BCG450-SD)
4.9.1 Description of the
Functions
4.9.2 Operating Parameters
4.9.2.1 Operating Software
4.9.2.2 Node Address Setting