5
VFD-B Series
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5-55
There is a built-in RS-485 serial interface, marked (RJ-11 Jack) on the control
terminal block. The pins are defined below:
6
1
1: EV
2: GND
3: SG-
4: SG+
5: NC
6: for communication
Each VFD-B AC drive has a pre-assigned communication address specified by
Pr.09-00. The computer then controls each AC drive according to its communication
address.
A VFD-B can be setup to communicate on Modbus networks 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 Pr.9-04.
Code Description:
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’ (36Hex) and ‘4’ (34Hex).
Character ‘0’ ‘1’ ‘2’ ‘3’ ‘4’ ‘5’ ‘6’ ‘7’
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
RTU mode:
Each 8-bit data is the combination of two 4-bit hexadecimal characters. For example,
64 Hex.
2. Data Format
10-bit character frame (For ASCII):
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