5. Serial Interface
5.1 Serial Specifications
(1) Synchronous | Asynchronous |
(2) Baud rate
150, 300, 600, 1200, 2400, 4800, 9600 BPS One of the above baud rates is selected by users.
(3)Data Format Start bit: 1 BIT
Data bit: 7 or 8 BIT
Parity bit: Odd number parity, even number parity or no parity check, one of which is selected by users.
Stop bit: 1 or 2 BIT
(4) Signal level |
|
|
MARK = 1 | ||
| SPACE = 0 (+3V ~ +12V) | |
CURRENT LOOP | MARK = 1 | (Current) |
| SPACE = 0 | |
TTL | MARK = 1 | (Open collector) |
| SPACE = 0 | (Open collector) |
(5)DTR signal RS232C and TTL
MARK: Not ready for DATA receipt
SPACE: Ready for DATA receipt Current loop
When current between connector 17 pin and 24 pin is MARK (Current): Ready for DATA receipt SPACE
CITIZEN | 13 |