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Introduction Chapter 1
2
Outlook of A51
1.2 Features and Specifications
Features
Both A50 and A51 are RS-232 to RS-422/RS-485 bidirectional
converters except that A51 has one more feature: isolation
protection, which provides high voltage protection up to 2000V.
All the switches, SW1 and SW2, of A50/A51 are designed to be
inside of the converter to protect switch settings from
unintended change and introducing communication error
without any warning. Hence, it is necessary to take the two
screws off and open the cover up if you need to change the
operation mode via sliding the switches.
The A50/A51 must be powered either from a DC +9V to +30V,
RS-422/485
RJ-45 Connector
Power Jack
RS-232
RJ-45 Connector
RS-422/485 RS-232
A51
C
onverter
IsolatedRS-232toRS-422/485
A51
T
X
D
R
X
D
R
T
S
P
W
R