Operators Manual
ALS 230
7. Serial interface
The machine has a serial interface according to the standard RS232C. Via this interface parameters can be adjusted. All received commands are tested for syntax and legal value range.
Invalid commands and parameters are ignored. An error message is not given in this case. All commands received over the serial interface are tested for syntax and range; invalid commands and out of range parameter values are ignored. A warning message is not given in these cases. However in the case of framing, parity or overrun errors the warning "W__3" is generated.
The commands are made up of sequences of ASCII characters. Each command starts with "#" and "!" followed by a 4 character code. The reception of the "#" character indicates the start of a new command to the machine.
The codes are similar to the parameter names shown in the display.
7.1 Data of the serial interface
The pin connection of the interface plug is shown in the table below.
Dispenser connector |
| Signal description | PC | |||
25 pol D- | 9 pol D- | Direction | Code | Description | 25 pol | 9 pol |
Sub | Sub |
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Socket 2 | 3 | Output | TxD | Transmit data | 3 | 2 |
Socket 3 | 2 | Input | RxD | Receive data | 2 | 3 |
Socket 5 | 8 | Input | CTS | Clear to send | 4 | 7 |
Socket 4 | 7 | Output | RTS | Request to send | 5 | 8 |
Socket 7 | 5 |
| GND |
| 7 | 5 |
Socket 20 | 4 | Output | DTR |
| 6 | 6 |
Socket 24 |
| (if jumper | + 10V | For external use | 8 |
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| on) |
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All other pins are not connected. | |
Adjustable data values | |
Baudrate | 150, 300, 600, 1200, 2400, 4800, 9600, 19200 Baud |
Data bits | 7 or 8 bits |
Stop bits | 1 or 2 bits |
Parity | No Parity, Parity bit always 0, odd or even parity |
Handshake | RTS/CTS |
Factory | interface deactivated, at reactivation the parameters will be set to 8 data bits, 2 | ||
| stop bits and no parity bit. |
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Release 11/05 | Page 51 | Serial interface | |
