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2.1
CONNECTIONS, CONTINUED
2.1.3 RS485 Input
The HDCD8TP can be connected to an RS485 transmitter such as a controller using the
3-way screw terminal connector. RS485 commands input at the RS485 Input connector
are outputted on all eight RS485 outputs (O/P1...O/P8). RS485 data received at any of
the eight O/P connectors is outputted as RS485 at the RS485 Input connector.
2.1.4 RS485 Input/Uplink
The RS485 Input connector is internally connected to the RS485 Input/Uplink connector
to enable HDCD8TPs to be connected in a RS485 daisy- chain wiring configuration.
(See Figure 5.) The maximum distance to the last unit in the daisy-chain is 4000 feet.
st
1
HDCD8TP
Termination Off
RS485 Input/Uplink Data +
RS485 Input/Uplink Data -
Screen
2.1.5 O/P Connectors
There are eight (8) O/P connectors. Data input from either the RS232 PC Control
connector or the RS485 Input connector is outputted as RS485 data at all eight O/P
connectors. Data received at any of the eight O/P connectors is outputted as RS232
data at the PC Control connector and as RS485 at the RS485 Input connector.
Rev. B
Transmitter
HDCD8TP
RS485 Input
Data +
Data+
Data -
Data –
Cable Shield
Screen
nd
2
HDCD8TP
Termination Off
RS485 Input Data+
RS485 Input Data –
Screen
RS485 Input/Uplink Data +
RS485 Input/Uplink Data -
Screen
4
rd
3
HDCD8TP
Termination On
RS485 Input Data+
RS485 Input Data -
Screen
HAMU000876
12/29/04
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