DK Digital CDB-700 Instruction Manual download pdf (Page 9)

IMR02C16-E3 3

2. SPECIFICATIONS

 RKC communication

Interface: Based on RS-485, EIA standard

Connection method: 2-wire system, half-duplex multi-drop connection

Synchronous method: Start-stop synchronous type

Communication speed: 2400 bps, 4800 bps, 9600 bps, 19200 bps

Data bit configuration: Start bit: 1

Data bit: 7 or 8

Parity bit: Without, Odd or Even

Stop bit: 1 or 2

Protocol: ANSI X3.28-1976 subcategories 2.5 and A4

RKC communication protocol

Polling/selecting type

Error control: Vertical parity (With parity bit selected)

Horizontal parity (BCC check)

Communication code: ASCII 7-bit code

Termination resistor: Externally terminal connected (Example: 120 Ω 1/2 W)

Xon/Xoff control: None

Maximum connections: Up to 31 controllers

Signal logic: RS-485

Signal voltage Logic

V (A) − V (B) ≥ 2 V 0 (SPACE)

V (A) − V (B) ≤ −2 V 1 (MARK)

Voltage between V (A) and V (B) is the voltage of (A) terminal

for the (B) terminal.

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DK Digital CDB-700 Instruction Manual Page 9