58
If the operator’s manual or labeling at the connector of the device
does not use the DTE/DCE terminology, its configuration can be
determined by identifying the function of pin 3 on the RS232 con-
nector from a schematic, pinout, or signal diagram. If pin 3 is la-
beled INPUT, DATA IN, RECEIVED DATA, RD, RxD, or a similar phrase,
then the device is DTE; otherwise it is DCE.
The pins on the RS232 cable of the HERMIT are listed below. Signal
directions are referenced to the HERMIT.
PANEL
25-PIN RS232
CONNECTOR CONNECTOR
SIGNAL NAME
DIRECTION
A
7
Signal Ground
—-
B
2
Receive Data (RD)
Input
C
20
Data Set Ready (DSR) Input
D
4
Clear to Send (CTS)
Input
E
5
Request to Send (RTS) Output
F
3
Transmit Data (TD)
Output
PANEL
9-PIN RS232
CONNECTOR CONNECTOR
SIGNAL NAME
DIRECTION
A
5
Signal Ground
—-
B
3
Receive Data (RD)
Input
C
4
Data Set Ready (DSR) Input
D
7
Clear to Send (CTS)
Input
E
8
Request to Send (RTS) Output
F
2
Transmit Data (TD)
Output
The RTS output goes high when the HERMIT is ready to dump data
and remains high until the output is complete. The DSR input must
be high and remain high for the HERMIT to recognize that an exter-
nal device is connected. Data are output via TD.
The DTS and RD inputs are used for handshaking. CTS high indi-
cates that the receiving device is ready; low indicates that is is not
ready. The HERMIT will accept XON/XOFF (DC1/DC3) character
handshaking on the RD input. If CTS remains low (not ready) or no
XON character is received after XOFF for 3 seconds on the HERMIT
1000B or for 90 seconds on the HERMIT 2000, the HERMIT will
abort the output procedure. If DSR is lost any time during the trans-
fer, the instrument will abort immediately.
MESSAGE
SOLUTION
Break signal detected. This
•Verify that the communication
message may also appear at parameters in DataTransfer and
the end of data transfer, or
the HERMIT match.
if the connection to the PC
•Verify that there is data in the
is broken. This message
HERMIT at the test being dumped.
does not necessarily
•Transfer the HERMIT Test line
indicate an error.
to the PC.
Parity error.
•Verify that the parity setting on
the PC and the HERMIT match
(No parity is strongly suggested).
Framing error.
•Verify that the character length
(data bits) setting on the PC and
HERMIT match (8 bits with no
parity is strongly suggested).
Overrun error.
•Verify that the communication
parameters in DataTransfer and
on the HERMIT match.
The number of columns
•No more than 24 input chan-
being transferred exceeds 24. nels can be transferred at a time.
(Dual-mode inputs take 2
(This number is decreased by 1
columns.) Transfer aborted. for each input channel contain-
ing dual-mode inputs.) Transfer
fewer columns of data.
Error Messages During Transfer (continued)
If these remedies do not solve the problem, contact In-Situ Inc. for
assistance. Please note the exact conditions under which the error
occurred so that efficient technical support can be provided.
The Accessory Cable
RS232 serial interfaces are designed to connect one piece of Data
Terminal Equipment (DTE) to one piece of Data Communications
Equipment (DCE). The accessory cable supplied with your HERMIT
is configured as DCE with a male connector. It will connect directly
to any RS232 port that is configured as DTE with a female connec-
tor. If the RS232 port of the personal computer is not configured as
DTE with a female connector, it will be necessary to wire an adapter.
Appendix F: DataTransfer
