Half duplex communication use the two lines of T/R+ and T/R-,
point-to-point and point-to-multipoint full duplex communication
use the four lines of T/R+, T/R-, RXD+ and RXD-.
UT-217EE interface converter supports the following 4
communication modes:
1. Point-to-point 4-line full duplex
2. Point-to-multipoint 4-line full duplex
3. Point-to-point 2-line half duplex
4. Point-to-multipoint 2-line half duplex
In order to prevent the signal reflection or interference when
converter is used in full-duplex or half-duplex mode.
V. Communication connection chart
Conversion from RS-232 to RS-422
1.RS-422 point-to-point 4-line full duplex
communication
2. RS-485 point-to-multipoint /2-line half duplex
RS-422 Machine
UT-217E
Conversion from RS-232 to RS-485
1. RS-485 point-to-point /2-line half duplex
2. RS-485 point-to-multipoint /2-line half duplex
3. Half-duplex communication connections between
UT-217E interfaces
3. Half-duplex communication connections between
UT-217E interfaces
UT-217E
UT-217E
UT-217E
UT-217E
UT-217E
UT-217E
VI. Problems and resolutions
1. Data communication failure
A. Make sure RS-232 interface connection is correct.
B. Make sure RS-485/RS-422 output interface
connection is correct.
C. Make sure power supply is OK.
D. Make sure the wire terminal connection is OK.
E. Make sure the pilot lamp flashes when receiving.
F. Make sure the pilot lamp flashes when sending.
2. Data missing or incorrect
A. Check to see whether if the data rate and format at both
ends of the communication equipment are consistent.
4
5
6
UT-217E
RS-422 Machine
RS-422 Machine
RS-422 Machine
RS-422 Machine
RS-422 Machine
RS-422 Machine
RS-422 Machine