| SP3238E | RS 232, 422, 485, 644, X21, V35 |
| SP3232EB | RS 232, 422, 485, 644, X21, V35 |
| SP3232EH | RS 232, 422, 485, 644, X21, V35 |
| SP3232 | RS 232, 422, 485, 644, X21, V35 |
| SP3232B | RS 232, 422, 485, 644, X21, V35 |
| SP3239 | RS 232, 422, 485, 644, X21, V35 |
| SP3232EU | RS 232, 422, 485, 644, X21, V35 |
| SP3232E | RS 232, 422, 485, 644, X21, V35 |
| SP3239E | RS 232, 422, 485, 644, X21, V35 |
| SP3238 | RS 232, 422, 485, 644, X21, V35 |