TxLD Keyboard Line Driver Installation Handbook Rev-02 Page 1
Building Block Video Ltd.,
17 Apex Park,
Diplocks Industrial Estate,
Hailsham, East Sussex, BN27 3JU, UK.
Tel:+44 (0)1323 842727
Fax:+44 (0)1323 842728
Support:+44(0)1323 444600
www.bbvcctv.com
Line Driver
Installation
Guide
BBVBBV
Models covered
TxLD
TxLD Keyboard Line Driver Installation Handbook Rev-02 Page 2
UNPACKING
Inspect the packaging for signs of damage. If damage has occurred,
advise the carriers and/or the suppliers immediately. Unpack the
product carefully and check that all the items are present and
correct.
The kit should contain,
1 x female/male D type interface lead,
2 x TXLD units, TXLD(B) & TXLD(K)
2 x 21mm surface mount patresses (one drilled for power connector
entry).
SAFETY PRECAUTIONS
All normal safety precautions laid down by British standards and the
Health and Safety at Work Act should be observed and servicing should
be referred to qualified service personnel.
Technical Specification
Power Requirements 9-12V ac/dc
Max Load <50mA at 12V
Input RS232 3 wire, Tx/Rx/Ground, DB9 patress plate
mounted.
Outputs RS485 twin twisted pair, WAGO
connector.
Facilities Pre-made cable provided to connect to Tx1000
base unit.
TXLD(B) powered from base unit. TXLD(K)
powered from keyboard’s PSU.
Box dimensions Standard single patress box.
Width: 88mm
Length: 88mm
Height: 54mm
Compatible Equipment Tx1000 series base units/keyboards, RS232
serial extension of BBV compatible equipment.
Most 3 wire RS232 links can be extended.
Temperature range -10
°
C to +40
°
C
TxLD Keyboard Line Driver Installation Handbook Rev-02 Page 3
INTRODUCTION
The TxLD is a simple to install, cost effective device for remote
installation of a BBV Tx1000 Slave Keyboard when the cable length for
the keyboard serial data exceeds 50 metres. The communications data
for the keyboard is RS232, which will become unreliable at distances
greater than this. The TXLD encorporates 4 differential tranceivers
that convert the RS232 data to RS485 and then back to RS232 at the
opposite end, this enables the data to be transmitted over cable
lengths ten times that of RS232. The TXLD’s are supplied on mounting
plates with single patresses for easy wall mounting.
INSTALLATION
There are two parts to the TXLD, TXLD(B) & TXLD(K). (The B for BASE, the K
for KEYBOARD).
Mount the patresses in relavant positions close to the TX1000 Base
Unit and the Slave Keyboard with cable entries made for the twin
twisted pair cable. Note that one patress has a hole drilled for a
power connector, this needs to be located at the Slave Keyboard.
• Line Length
The TxLD will perform optimally over any length of cable up to 1km
using the recommended cable type “BELDEN 9502”. Cables are easily
connected to the “WAGO” connectors on the PCB. Ensure cable run
is away from sources of interference and high current carrying
cables.
Wago Connectors
The Wago series 233 PCB
terminal block is a simple-
to-use method of attaching
cables to PCB’s quickly and
easily. The correct method
of attachment is
illustrated to the left.
Connection of the twin twisted pair wires to the TXLD PCB’s is made
via the grey Wago connectors located on the reverse side. It is
important to maintain correct polarity and ensure that RX and TX
cross over.
TxLD WIRING INSTRUCTIONS.
1. INSERT SCREWDRIVER
PRESS LEVER TO OPEN
CAGE CLAMP
2. INSERT STRIPPED
CONDUCTOR
RELEASE
LEVER 3.
TX A
TX B
RX A
RX B
TX A
TX B
RX A
RX B
TXLD(B)
Connections
TXLD(K)
Connections
Twin Twisted Pair Cable
TxLD Keyboard Line Driver Installation Handbook Rev-02 Page 4
After connecting the twin twisted pair cable, screw back the mounting
plate of TXLD(B) and connect to the TX1000 base unit keypad 2
connector with the serial lead supplied. The TXLD(B) does not require
a power supply, it obtains its supply form the Base Unit.
Before screwing back the TXLD(K) mounting plate, make sure the hole
dilled for the power connector lines up with the connector on the
TXLD(K) PCB. Connect the Slave Keyboard power supply to the power
entry on the TXLD(K), plug in the Slave Keyboard. The keyboard will
not need a separate power supply as it is now powered through the
serial lead.
The video connection will need to be made from Monitor 2 output on
the TX1000 Base Unit, through the Slave Keyboard (for on-screen text) and
on to a monitor.
B BV
3
0
0
LE
NS
LE
NS
IR
IS
FOC
US
ZO
OM
PROG
RAM
#
AUTO
PAN
9
1
0
1
1
1
2
1
3
1
4
1
5
1
6
875 6431 2
CAM
ERA
SEL
ECT
MONI
TOR
P
A
N
+
TI
LT
PRE
SET
PAT
ROL
SE
Q
B BV
10
00
Tx1000 base unit
Tx1000 Slave Keyboard
TxLD(B)
TxLD(K)
Keyboard PSU
Twin Twisted Pair
500M
B BV
3
0
0
LE
NS
LE
NS
IR
IS
FOC
US
ZO
OM
PROG
RAM
#
AUTO
PAN
9
1
0
1
1
1
2
1
3
1
4
1
5
1
6
875 6431 2
CAM
ERA
SEL
ECT
MONI
TOR
P
A
N
+
TI
LT
PRE
SET
PAT
ROL
SE
Q
B BV
10
00
Tx1000 Master Keyboard
Upto 50M
Graphic Illustration of TXLD
Installation
/
