WinSystems PCM-VDX-2-512, Руководство по эксплуатации продукта

Страница: 26 / 75

140808 PRODUCT MANUAL PCM-VDX-2-512 26
COM3 and COM4 Configuration Options in BIOS
1. RS-232 Mode
2. RS-422 Mode with RTS transmitter enable
3. RS-422 Mode with auto transmitter enable
4. RS-485 Mode with RTS transmitter enable
5. RS-485 Mode with RTS transmitter enable and echo back
6. RS-485 Mode with auto transmitter enable
7. RS-485 Mode with auto transmitter enable and echo back
Mode(s) Configuration Note
2, 4, 5 Require the RTS bit (MCR Bit 1) to be set in order to transmit.
3, 6, 7 Require TX/RX(300) termination on one node.
4 Requires the RTS (MCR Bit 1) be de-asserted in order to receive.
* Each of the RS-422/RS-485 modes allow for jumper selection of transmit and/or receive termination and
biasing resistor(s). An 8-pin configuration jumper is provided for each port.
COM3 = JP1
COM4 = JP3
Termination Resistors
1 3 5 7
2 4 6 8
□ □ □ □
□ □ □ □
RS-422 Termination and Biasing Resistors
TX (100): Places a 100Ω Resistor across the TX± pair 7-8
RX (100): Places a 100Ω Resistor across the RX± pair 1-2
TX/RX(300):
Places a 100Ω Resistor from +5V to TX+ 5-6
Places a 100Ω Resistor between TX± 7-8
Places a 100Ω Resistor from Ground to TX- 3-4
RS-485 Termination and Biasing Resistors
TX (100): Places a 100Ω Resistor across the TX/RX± pair 7-8
TX/RX(300):
Places a 100Ω Resistor from +5V to TX/RX+ 5-6
Places a 100Ω Resistor between TX/RX± 7-8
Places a 100Ω Resistor from Ground to TX/RX- 3-4
Revision prior to E PCB
products require a wire-wrap
jumper from 2-3.
Revision prior to E PCB
products require a wire-wrap
jumper from 1-4.
Revision prior to E products
require a wire-wrap jumper
from 1-4.