Metrohm 765 Dosimat - Manual (Page 53)

4.4 Pin assignment of the RS232 / I/O socket
765 Dosimat
49
Definition of signal states
- Data interchange circuits (TxD, RxD)
voltage negative (<-3 V): marking condition
voltage positive (>+3 V): spacing condition
- Timing and control interchange circuits (CTS, RTS, DTR, DSR,
RLSD)
voltage negative (<-3 V): OFF condition
voltage positive (>+3 V): ON condition
In the transitional range from +3 V to -3 V the signal state is unde-
fined.
Driver 1488 according to EIA RS 232C specification
Receiver 1489A according to EIA RS 232C specification
Ordering numbers for 25 pin plug (socket A):
K.210.9004 (shell) and K.210.002
Important: The pin numbers are not used according to the RS232
standard version. Therefore do not plug in standard RS232 cables!
Ordering number for 8 pin plug (socket B):
K.101.0004
No liability whatsoever will be accepted for damage caused by im-
proper interconnection of instruments.