SATEC 1771DB - Manual (Page 11)

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1. Check whether the processor is in RUN mode.
2. Make sure the I/O configuration settings for the BASIC module slot are correct.
3. Check whether your ladder program is correct.
The BASIC module doesn't interface to the instruments
The following symptoms indicate that the communications do not operate properly:
1. A non-zero error code is received by the processor in word 64 in the BTR buffer when
you are using the driver with E option.
2. No data transfer occurs when you have the driver without E option.
A problem might exist for all the Powermeters connected to the BASIC module or for some
of them. Note that for the disconnected instruments, that would be a normal response. If you
use the driver with the E option, to check communications, you must have the processor
running the ladder program that controls the data transfer.
If you encounter that the problem exists for all the instruments, determine whether one of the
following is the cause:
1. Make sure that the baud rate for the BASIC module peripheral port is set correctly. For
information on the jumper setting for the peripheral port, refer to Section 2.2.
2. Check whether the Powermeters turned on, you have the correct cable, and it is properly
connected to the BASIC module peripheral port and to the Powermeters. For the cable
drawings, refer to Appendix B.
3. Make sure all communications settings (baud rate, data bits, parity, protocol, instrument
address) are set correctly in the instruments, and the baud rate setting conforms to the
BASIC module peripheral port baud rate. For information about communications settings
for the Powermeters, refer to Section 2.3.
When the problem exists for some of the Powermeters, the cause is often related to the
improper cable connection or incompatible communications settings made in the instruments.
The following indications might help you to detect what the problem is related to:
1. When the driver requests the instrument, the XMTG LED flashes for a short time. If the
instrument doesn't respond, then the XMTG LED flashes three times with a short interval
between flashes.
2. When the instrument responds, the RCVG LED flashes for about 1/2 of a second. If the
response is OK, then there will be an interval for about 4-5 seconds while the driver
processes the acquired data, until the next request is made.
3. If there are no connections in the communication network, the XMTG LED will flash
continuously by series of three flashes with a short interval between series.