Packet Size - Variable
| IDN | Description |
| 1 | atom label1 of subject atom in cons |
| 2 | parameter number of subject atom; 1 to 9 for x to U23 |
| 3 | multiplication factor of subject parameter |
| 4 | constant, Q, in constraint equation |
| 5 | constraint classification key2 |
| 6 | site multiplicity of subject atom |
| 11 | atom label1 of the reference atom 1 |
| 12 | parameter number of reference atom 1; 1 to 9 for x to U23, |
| 0 for invariant | |
| 13 | multiplication factor for reference parameter of atom 1 |
| 21 | atom label of reference atom 2 |
| 22 | parameter number of reference atom 2 |
| 23 | multiplication factor for reference parameter of atom 2 |
| . . | . . . . . . . . . . . . . . . |
| n1-n3 | atom label, parameter, and multiplicity factor for atom n |
| 1 The general form of the constraint equation is: p(s)*f(s) = q + p(r1)*f(r1) + p(r2)*f(r2) + ... + p(rn)*f(rn) The ID numbers 1, 11, 21, etc. may appear in more than one word ifmore than one real word is required to store 24 chars. | |
| 2 Constraint classification KEY = 1 CONSTRAINED Constraint classification KEY = 3 INVARIANT Constraint classification KEY = 4 Polar Axis Direction For a constraint of KEY = 4, the axis is stored in ID 2 as 1=a, 2=b,or 3=c. The rest of the packet is null. | |