910-198E
8/19/03
Appendix I-2
Model 8500
Electrical Definition
Data is transmitted on one line (Data Out of Gage) and received on
another line (Data Into Gage). Data transfer, consisting of ASCII-coded
character strings, is a synchronous serial. Baud rate, word length, stop
bits and parity are selectable from the keyboard.
Data Format
Listed below are the electrical specifications for data transmittal:
Signal levels are RS-232 C/D compatible
Mark is less than -2.5 Volts
Space is greater than +2.5V
The maximum output signal range is ± 5.50 Volts
The maximum input signal range is ± 20 Volts
The following two hardware handshake lines are included:
DTR:
The gage sets DTR (Data Terminal Ready) low (<-2.5V)
when it is not able to receive data. DTR will be high (>+2.5V)
at all times.
DSR:
A high (>+2.5V) supplied by the external DSR (Data Set
Ready) device (or by being connected to the DTR line) will
enable the gage to transmit data. A low (<-2.5V) supplied by
the external device (or by being connected to the RTS line)
will prevent the gage from transmitting data.
Note:
If the external device does not provide the proper DSR sig-
nal, then DTR must be connected to DSR (jump pin 6 to pin
20 in the 25 position cable connector or in the 25-pin con-
nector on the attached equipment.
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