TX1500 Manual Combined 1Oct03 PSC
Page 7 of 31
Matrix
RS485 TELEMETRY OUT
Fig 7. TELEMETRY – RJ45 breakout box connector.
This port provides telemetry control via BBV RS485. Again a cat 5e RJ45 patch cable and breakout box is used
to connect the telemetry receivers via single twisted pair cable. It is possible to either wire the network in a daisy
chained or star configuration using an optional RS485 star card.
RS485 wiring configurations are shown below and on the following page.
RS485 TELEMETRY WIRING CONFIGURATIONS
Fig 8. Daisy Chained RS485 Telemetry Wiring
1 = DO NOT USE
2 = DO NOT USE
3 = DO NOT USE
4 = TxA to Telemetry Receiver RA(+)
TxB to Telemetry Receiver RB(-) = 5
DO NOT USE = 6
GROUND/SCREEN = 7
GROUND/SCREEN = 8
1 = DO NOT USE
2 = DO NOT USE
3 = DO NOT USE
4 = TxA to RA (+)
TxB to RB (-) = 5
DO NOT USE = 6
SCREEN = 7
SCREEN = 8
Camera 1
Camera 2
Camera 3
Camera 4
Rx457/557 Address 1
Rx457/557 Address 2
Rx457/557 Address 3
Un-Terminated
Un-Terminated
Un-Terminated
RS485 Telemetry
Coax
Coax
RS485 Telemetry
RS485 Telemetry
Terminated
Rx457/557 Address 4
Coax
Rx457/557 RS485 connectors
screen
T
R
A
T
R
B
G
N
D
R
A
R
B
screen
T
R
A
T
R
B
G
N
D
R
A
R
B
Keep stub length as
short as possible
Keep stub length as
short as possible
RJ45 breakout box
Keep stub length as
short as possible
screen
T
R
A
T
R
B
G
N
D
R
A
R
B
DETAILED VIEW
RJ45 patch cable
Maximum length of RS485 from Tx1500 to last receiver - 1200M
