www.LeonAudio.com.au
1
8
Set the following data format and transmission rate for
RS232 or RS485
* 1 start bit
* 8 data bits
* no parity
* 1 stop bit
* 9600 baud
Computer configuration
•
RS232 Serial Cable
•
Use a fully wired straight through DB9 modem serial cable.
A suitable fully wired cable is supplied with the
PCinterface.
Officially, the maximum length for RS232 cables is 15 metres
(50 feet), but in practice greater lengths usually work satisfactorily.
The following signals are used for data transmission.
Connections
USB
•
The
can be connected to a USB port using a
USB-RS232 adaptor cable. Some budget USB/RS232 cables are
not fully compliant and may not work correctly, if at all.
The “US232B 1m Converter Cable” made by FTDI have been
tested and do work correctly.
See http://www.ftdichip.com/Products/Cables/USBRS232.htm
PCinterface
cutout
5
9
4
8
3
7
2
6
1
Pin view of female DB9
If not using a fully wired cable, it should be wired as below
Data Output
Data Input
Isolated Ground
Data Input
Data Output
PC, Mac or
Show Controller
PCinterface
(QL-PCi Mk4)
Screen
The left hand connector is a DB9 on the PC/show controller.
You will need to add the wire links highlighted in red.
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1, 2 & 3 Isolated Gnd
4 Tx+
5 Tx-
6 Isolated Gnd
7 Rx+
8 Rx-
RJ45 (RS485) connector wiring
viewed with the latch facing away
Maximum cable length when using CAT5/6 cable is at least
1,500 metres (5,000 feet).
Two wire RS485 connections are not supported.
RS485 Serial Connection
•
The RS485 RJ45 connector can be wired using CAT5/6 cable.
This cable must not be connected to any Ethernet (Internet) system.
The colours shown are only a suggestion.
Pins 4 and 5 (transmit data) must use the same coloured pair.
Pins 7 and 8 (receive data) must use the same coloured pair.
The remaining 2 pairs are Isolated ground.
RS485 Breakout Board RS485BRK
•
The
RS485BRK
Breakout Board allows connection of cables other
than CAT5/6 to the PCinterface.
The Breakout Board can be DIN rail mounted or the mounting
brackets can be removed allowing it to be installed in a project box.
There are 5 screw terminal connections. Tx+, Tx-, Rx+, Rx- and Gnd.
50mm square by 18mm high (excluding the DIN mount brackets).
70.
Baud rate can be changed once communications have been
established at 9600 baud.
The new setting is saved when the power is off.
DTE
DCE
Receive Data (RXD): Pin 3
Transmit Data (TXD): Pin 2
Signal Ground: Pin 5
Ground