Rs-422 - Intermec EasyCoder 501 Service Manual

18.3

RS-422

Intermec EasyCoder 501 – Service Manual Ed. 7
RS-422 is a point-to-point interface for connection between one
printer and one host computer over a distance of up to 1,200 metres
(4,000 ft.) by use of a four-wire cable. The transmission is full
duplex, that is, reception and transmission can take place simulta-
neously.
RS-422 connection between host computer and printer.
RS-422 requires an additional circuit and a number of straps to be
fi tted on the CPU board:
-
+ RS422 IN
- RS422 IN
+ RS422 OUT
- RS422 OUT
+
P203
P202
P208
P206 232
CL
P209
422
P207
P204
IC-207
P205
Chapter 18 "uart1:"
P-203
(external +5V)
IC-207
(RS-422 circuit)
P-202
(interface select)
P-204 to P-209
(comm. straps)
151