- 60 - Aries User Guide
Depending on the communications protocol you are using, Aries can
automatically configure itself.
•
If using RS-232, Aries will automatically detect and configure itself
for that communications protocol.
•
If using RS-485 (two-wire) and the standard bias configuration,
Aries will automatically detect and configure itself for that
communications protocol.
For automatic detection to work, the RS-485 network must be
configured with an up bias on + (Talk) and a down bias on – (Talk).
RS-232 Communications
The Aries drive supports RS-232 communication. However, you
cannot
connect the drive in an RS-232 daisy chain.
Pinout for RS-232 Communication
Pin
Description
25
Rx (receive). Connect to Tx on your computer.
26
Tx (transmit). Connect to Rx on your computer.
24
DGND* (logic ground). Connect to DGND on your computer.
Maximum RS-232 cable length is 50 feet (15.25 meters).
* Many PC COM ports connect RS-232 ground to chassis ground.
Table 36 RS-232 Connector Pinout
RS-485 Communications
The Aries is designed to use RS-485 half-duplex (two-wire). In addition, you
can use it in multi-drop networks. For more information about multi-drop, see
“RS-485 Multi-Drop” on page
61
.
Pinout for 2-wire RS-485 Communication
Pin
Description
25
Connect to Tx/Rx+ on your computer.
26
Connect to Tx/Rx– on your computer.
24
DGND* (logic ground). Connect to DGND on your computer.
•
Maximum RS-485 cable length is 1000 feet (305 meters).
•
Keep wires as short as possible. Termination resistors may be required on long
cable runs.
•
Connect RS-485 cables before applying power to the drive.
(Reconnecting the cables with power applied may cause the drive to interpret
intermittent connections as RS-232 hardware handshake signals; this may result
in shutdown of the RS-485 interface. If this happens, reset the drive to re-enable
the RS-485 interface.)
•
Recommended cable: Belden 9842.
* Many PC COM ports connect RS-485 ground to chassis ground.
Table 37 RS-485 Connector Pinout
For connection information, see Figure 36.
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