Campbell Scientific CR200X CR200/CR200X-series Dataloggers - Page 154

Troubleshooting

Page 154 highlights

Section 15. Alternate Telecoms Resource Library • 05 Force Single Coil • 15 Force Multiple Coils • 16 Force Multiple Registers 15.1.3.5 Reading Inverse Format Registers Some Modbus devices require reverse byte order words (CDAB vs. ABCD). This can be true for either floating point, or integer formats. While other CRBasic dataloggers, such as the CR1000, can use the MoveBytes() instruction to output reverse byte order words, the CR200(X) does not have that capability. If reverse byte order words are required, either the master has to make an adjustment, which is sometimes possible, or the CR200(X) needs to replaced with a datalogger that supports the MoveBytes() instruction. 15.1.4 Troubleshooting Test Modbus functions on the CR200(X) with third party Modbus software. Further information is available at the following links: • www.simplyModbus.ca/FAQ.htm (http://www.simplymodbus.ca/faq.htm) • www.Modbus.org/tech.php (http://www.modbus.org/tech.php) • www.lammertbies.nl/comm/info/modbus.html (http://www.lammertbies.nl/comm/info/modbus.html) 142

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Section 15.
Alternate Telecoms Resource Library
05 Force Single Coil
15 Force Multiple Coils
16 Force Multiple Registers
15.1.3.5
Reading Inverse Format Registers
Some Modbus devices require reverse byte order words (CDAB vs. ABCD).
This can be true for either floating point, or integer formats. While other
CRBasic dataloggers, such as the CR1000, can use the MoveBytes() instruction
to output reverse byte order words, the CR200(X) does not have that capability.
If reverse byte order words are required, either the master has to make an
adjustment, which is sometimes possible, or the CR200(X) needs to replaced
with a datalogger that supports the MoveBytes() instruction.
15.1.4
Troubleshooting
Test Modbus functions on the CR200(X) with third party Modbus software.
Further information is available at the following links:
www.simplyModbus.ca/FAQ.htm
(
)
www.Modbus.org/tech.php
(
)
www.lammertbies.nl/comm/info/modbus.html
(
)
142