Specifications

TH230/230+ Programmer’s Guide
243
RS232 Interface
Specifications
Data transmission: Serial
Synchronization:
Asynchronous
Handshaking: DTR/DSR or XON/XOFF control
Signal levels: MARK = -3 to -15 V: Logic "1" / OFF
SPACE = +3 to +15 V: Logic "0" / ON
Baud rate: 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200 bps
(bps: bits per second)
Data word length:
8 bits
Stop bits: 1 bit
Parity settings
none, even or odd
For default settings and changing those please refer to GS ( E pL pH fn a d1...dk <Function
11> (page 114).
Handshake control
In DTR/DSR mode the RTS line is switch parallel to DTR to be conform to older cable
variants!
Receiving data
DTR/RTS MARK - between power on and ready to accept data
- in an error state
- remaining space in data buffer falls below off-hysteresis
XOFF sent - in an error state
- remaining space in data buffer falls below off-hysteresis
DTR/RTS SPACE,
XON sent
- when ready to accept data
-
remaining space in data buffer rises above on-hysteresis
Sending data
In DTR/DSR mode, data is sent only when DSR is SPACE.
In XON/XOFF mode, DSR is ignored.