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Gemini GT Hardware Installation Guide
RS-232/485 Communications
The Gemini drive has a single serial port marked, “
RS-232/485
,” on the front of the
unit. In the following this port will be referred to as the COM port. The Gemini
drive uses a binary language for communication; it does not use ASCII. To enable
6000 ASCII level communication in a terminal mode, the Gemini uses a translator
utility in Pocket Motion Planner and in the CommServer (for use with Motion
Planner). In all other ways, the serial communication functions in the Gemini
behave like other Compumotor products. Gemini drives can be connected together
in RS-232 Daisy Chains and RS-485 Multi-Drop configurations.
In this section:
•
Establishing Communications
•
Configuring the serial port
•
RS-232 Communications
•
RS-232 Daisy Chaining
•
RS-485 Communications
•
RS-485 Multi-Drop
Establishing Communications
The drive’s configuration port is a 9 pin D-connector. You can use it for either RS-
232 or four wire RS-485 communications, as shown in the next drawing.
2
1
3
4
5
6
7
8
9
Rx-
(RD A)
Tx-
(TD A)
6
7
8
9
2
1
3
4
5
Rx Tx
Gnd
Gnd
Rx+
(RD B)
Tx+
(TD B)
Gemini Drive
RS-232 Connections
1. RS-485 Rx+ (RD B)
2. RS-232 Receive
3. RS-232 Transmit
4. RS-485 Tx+ (TD B)
5. Ground
6. No connection
7. RS-485 Rx– (RD A)
8. RS-485 Tx– (TD A)
9. No connection
Gemini Drive
Pin Assignments
Gemini Drive
RS-485 Connections
RS-232/485 Connections
To communicate with the drive, connect the drive’s RS-232/485 connector to a PC
running Motion Planner, or to a palm PC running Pocket Motion Planner with
Windows CE. Verify your computer’s connector pinout; you may need to use a
“null modem” cable to connect your computer’s transmit terminal to the Gemini’s
receive terminal, and your computer’s receive terminal to the Gemini’s transmit
terminal.
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