Edwards ELD500 Series, Инструкция по эксплуатации

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D13510840D - Interface description
Page 76
ASCII Protocol
Communication Parameters
Preface
The RS232 journal uses an ASCII format: so every leak detector can be controlled with a
simple terminal program.
Choose the interface journal "ASCII" to approach the leak detector with the computer via
RS232 interface.
In case the leak detector shall also be controlled via computer (START, STOP, ZERO, etc.), affix
the location of control at the leak detector to "All", "RS232" or "Local and RS232".
Interface connecting cable
The interface (RS232) is wired as data communication equipment (DCE). The connection is
made via a 9-way sub-D socket at the leak detector. The signals are assigned as follows:
The other pins are not used.
The levels on the RS 232 interface are defined as follows:
A standard RS232 cable can be used (straight-through connecting cable, RxD and TxD not
crossed). The RS232 hardware handshake must be switched off (in RS232 control program
written by the user).
Data format
Baudrate 19200 baud, 8 data bits, 1 stop bit, no parity.
Note:
The command list in this interface description is valid from software version 3.0. Older
software versions may not contain all functions of the command list.
Pin Name Signal
2 RXD Receive data (ELD500 --> PC)
3 TXD Transmit data (PC --> ELD500)
5 GND Reference ground
Level Low (L) High (H)
Voltage range -3 V to -25 V 3 V to 25 V
Logic state logical 1 logical 0
Level designation Mark Space