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In this mode the software will control an external VTR or VDCP/Odetics server. By default COM2: is used for VTR/DDR control. Converters for this operation are available from: B&B Electronics Drastic Technologies® Device Emulation (acting as a VTR)
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| Pin | Signal |
| 1 | Frame Ground |
| 2 | TD A -, Transmit A Minus |
| 3 | RD B +, Receive B Plus |
| 4 | Receive Common |
| 5 | Spare |
| 6 | Transmit Common |
| 7 | TD B +, Transmit B Plus |
| 8 | RD A -, Receive A Minus |
| 9 | Frame Ground |
In this mode the software will appear as a VTR or VDCP/Odetics server.
By default COM1: is used for VTR/DDR emulation. Currently there are no commercial converters with this exact wiring. Fortunately, standard converters (as above) can be rewired to the correct wiring for device emulation. Drastic® is also developing a solution to this problem.
B&B Electronics
Model 422LP9R 69.95USD
With custom 422NULL cable described below.
Drastic Technologies®
Model 232to422IN (Under development)
RS-422 NULL Cable
Currently a pin converting cable is required to use device control converters as device emulator converters. This cable will only work with a 'fully wired' RS232-422 converter such as the B&B above. Many low cost converters only include a single 422 balancing circuit. This works fine for VTR control as the VTR sees the balanced serial properly, but with the NULL cable, the device no longer sees the balanced signal.
|
RS422C Pin |
Purpose |
RS422D Pin |
| 1 | Frame Ground | 1 |
| 2 | RD A -, Receive A Minus | 8 |
| 3 | TD B +, Transmit B Plus | 7 |
| 4 | Transmit Common | 6 |
| 5 | No Connect | 5 |
| 6 | Receive Common | 4 |
| 7 | RD B +, Receive B Plus | 3 |
| 8 | TD A -, Transmit A Minus | 2 |
| 9 | Frame Ground | 9 |
RS-422 Null Wiring
Hardware Solutions
There are a number of RS-422 PCI and ISA cards that may be used in place of the on-board COM ports. Once installed, the software can be configured to use the ports using the LocalConfig program supplied in the installation. With the cards, the wiring setup is critical. Please refer to the diagrams above for the correct wiring for each mode.
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