Group 90 — Communications
MVX9000 User Manual 5-67
Descriptions of
Parameter Settings
Computer Control
There is a built-in RS-485 serial interface (RJ-11 Jack) at the top of the drive near
the Input power.
The pins are defined in Figure 5-52:
Figure 5-52: Pin Definition
Each MVX9000 AC drive has a pre-assigned communication address specified by
90.02. The computer then controls each AC drive according to its address.
The MVX9000 can be set up to communicate on a Modbus network using one of
the following modes: ASCII (American Standard Code for Information
Interchange) or RTU (Remote Terminal Unit). Users can select the desired mode
along with the serial port communication protocol in 90.01 and 90.03.
Code Explanation
ASCII mode:
Each 8-bit data is the combination of two ASCII characters. For example, a 1-byte
data: 64 Hex, shown as “64” in ASCII, consists of “6” (36 Hex) and “4” (34 Hex).
Table 5-4: ASCII Characters
RTU mode:
Each 8-bit data is the combination of two 4-bit hexadecimal characters. For
example, 64 Hex.
Character 01234567
ASCII code 30H 31H 32H 33H 34H 35H 36H 37H
Character 8 9 A B C D E F
ASCII code 38H 39H 41H 42H 43H 44H 45H 46H
6 1
1: +15V
2: GND
3: SG-
4: SG+
5: NC
6: Reserved
(for communication keypad)
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