User manual

Computer Gateway User Manual 2-8 5/96
2.3.2
2.3.2 Use of 16-Character Point Names
This release of the CG is compatible with previous TDC releases (R230 and the R300
series of releases) that use 8-character point names. It also supports the use of long point
names (up to 16 characters).
Support for long point names is provided through new versions of those message
transactions between the Host Processor and the CG that use point names. Each of these
new messages is identified by a transaction code 100 greater than their short point name
equivalent. A summary of these message types follows:
Short Point Name Long Point Name
Message name Transaction Code Transaction Code
Operator Message Confirmation/Timeout 1 101
Turn on ACP 2 102
Get Data Request (Internal DDT in CG) 3 103
Get Data Request (Internal DDT in host) 4 104
Store Data Request 5 105
Build Internal DDT Request 6 106
Get Data Return 7 107
Store Data Return 8 108
Get Message Request 13 113
Send Message Request 15 115
ACIDP Execution State Change Request 21 121
ACIDP Program Mode Change Request 22 122
Get ACIDP Status Request 24 124
Get ACIDP Statue Return 25 125
Get Single Value Request (ext adr) 28 128
Get Single Value Return (ext addr) 29 129
Store Single Value Request (ext addr) 35 135
Store Single Value Return (ext addr) 36 136
Store Single Value Request (int addr) 37 137
Store Single Value Return (int addr) 38 138
Get Single Value Request (int addr) 39 139
Get Single Value Return (int addr) 40 140
Convert Identifier Request 41 141
Convert Identifier Return 42 142
Internal DDT Connect or Disconnect Request 45 145
Internal DDT Connect or Disconnect Return 46 146
CG Database List Request 47 147
ACIDP/CRDP/DDT Tables List Return 48 148
Get History Request 50 150
Get History Return 51 151
NOTE
When communicating with an R400 or subsequent release LCN system, the host processor
should always use the 16-character-name message transactions. If the target LCN is
configured for 8-character names, space fill the final 8 bits of each name.