PACSystems VersaMax Genius Network Interface User Manual Section 5
GFK-1535D Jan 2023
Configuration 89
5.5.3 Write Configuration Data
Subfunction Code: 04 hex
The Write Configuration datagram is used to send configuration data for
the NIU or a module in the I/O Station.
When the NIU is configured for Enhanced Diagnostics Mode or GMR
Mode, the NIU will not accept any Write Configuration datagrams. If
you attempt to enable Enhanced Diagnostics Mode or GMR mode via
a write configuration datagram, the NIU will not accept the
datagram.
The context-dependent slot configuration data is the same as the Read
Configuration Reply. For each rack in the I/O Station, slot 0 configuration
data includes the power supply, I/O carriers, and any booster power
supplies present. Because configuration datagrams consider power
supplies and carriers to be slot 0, this numbering scheme is different that
the actual slot numbering described elsewhere in the manual. In rack 0,
slot 1 configuration is the NIU. In expansion racks 1-7, slot 1 is used for
the Expansion Receiver Module. Up to eight I/O modules per “rack” can
be configured as slots 2 through 9.
Do not send partial configuration data; it will be rejected by the NIU. If
the data is more than 128 bytes in length, multiple packets may be used.
Use the Begin and End Packet sequence messages to ensure that a
sequence of Write Configuration messages is treated as a single entity.
Each packet should be in slot order. Multiple packets for a slot must also
be in order. Multiple packets must be 128 bytes in length except the last
which may be shorter.
Note: Multiple-byte fields in datagrams are transmitted with the least significant byte of a
word in the lowest memory location or transmitted first in time. The most
significant byte follows.
Example:
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