Chapter 2 Basic Unit Specification
3. Communication ports
2-10
Communication setting for PC/PDA port (D8321)
Item Bit Description
Data length (B0) 1: 8 bit
Parity bit (B2,B1) (0, 0): no parity (0, 1): odd check (1, 1): even check
Stop bit (B3) (0): 1bit (1): 2bits
Baud rate
(Kbps)
(B7,B6,B5,B4)
(0, 1, 1, 1): 9.6
(1, 0, 0, 0): 19.2
(1, 0, 0, 1): 38.4
(1, 0, 1, 0): 57.6
Note 1: PC/PDA communication port supports Modbus RTU with a fixed Data length 8bit；
Note 2: The modified data for D8321will take effect at the next scan time after communicaton
finished.
Note 3: However, if D8321 is not set inside the scope, the defaulted communication format for
PC/PDA will be take effect (Baud Rate: 19.2kbps; 8 bit data length, 2bit for stop bit, and
without parity bit).
Communication format setting for RS485 (D8120)port and Expansion card (D8320)
D8120 & D8320
Item
Bit Description
Data Length (B0) (0): 7 bit (1): 8 bit
Parity bit (B2,B1) (0, 0): no parity (0, 1): odd parity check (1, 1): even parity
Stop bit (B3) (0) : 1bit (1) : 2bit
Baud
rate(Kbps)
(B7,B6,B5,B4)
(0, 0, 1, 0) : 300
(0, 0, 1, 1): 600
(0, 1, 0, 0): 1200
(0, 1, 0, 1): 2400
(0, 1, 1, 0): 4800
(0, 1, 1, 1): 9600
(1, 0, 0, 0):19200
(1, 0, 0, 1): 38400
(1, 0, 1, 0): 57600
(1, 0, 1, 1): 76800
(1, 1, 0, 0): 128000
(1, 1, 0, 1): 153600
(1, 1, 1, 0): 307200
Start character (B8) (0) : NO (1) : enabled, default: STX(02H)
End character (B9) (0) : NO (1) : enabled, default: ETX(03H)
Control bits (B10,B11,B12) (0,0,0): control mode (without-hardware-control)Æreserved
ModBus mode (B13) (0) : RTU mode (1) : ASCII mode
0 (B14) Reserved
0 (B15) Reserved
Note 1: B0~B7 for setting communication format and baud rate, which are available for all the
Functions.
B8~B9 is just for RS instruction;
B10~B12, B14~B15 are reserved；
B13 is just for MBUS instruction. Only RTU mode is available for ModBus slave.
Note 2: SHL terminal should be 3 class ground or the production will be interrupted to error
operation because of noise.
Note 3: COM terminal is not connected internally with FG terminal.
Note 4: The isolated twisted cable should be 0.5mm
2
with 30mm unshielded end for connecting to
terminal block.
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