3. REMOTE CONTROL
3-1. RS-422 Control
3-1-1. Outline
JP2pro_rev.S has a D-SUB 9-pin female connector on the rear panel that conforms to
EIA RS-422 Serial Remote Control Protocol. Most of controllers with the same control
protocol can remotely control this product. The following description explains the
contents of the serial protocol and the serial transmission sequence.
3-1-2. Architecture of the serial transmission data
・
4-wire-transmission system.
・
Asynchronous bit-serial word-serial data transmission.
・
Data structure: 1 Start bit+8 Data bits+1 Parity bit+1 Stop bit
Start
bit
D0
(LSB)
D1 D2
D3
D4
D5
D6
D7
(MSB)
Parity
(Odd)
Space
Mark
(Note 1) Odd Parity: The sum of the D0+D1+---D7 and Parity bit is an odd number.
(Note 2) Mark B>A; (Voltage on line B is higher than that on Line A)
Space A>B (Voltage on line A is higher than that on Line B)
3-1-3. Command Format
Communication between control systems and this product uses the following command
telegram format:
CMD 1/Data count, CMD 2, and data checksum (CHECKSUM).
If Data count is zero, no data is transmitted. If it is not zero, the data corresponding to
the existing values are inserted between CMD2 and CHECKSUM.
Bit
4-7
Bit
0-3
CMD 1
Data
count
CMD 2
DATA 1
--------
DATA N
N=15max
CHECKSUM
18
