151Intermec EasyCoder 501 – Service Manual Ed. 7
Chapter 18 "uart1:"
+ RS422 IN
- RS422 IN
+ RS422 OUT
- RS422 OUT
RS-422 connection between host computer and printer.
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 requires an additional circuit and a number of straps to be
fi tted on the CPU board:
18.3 RS-422
232
CL
422
"UART1:"
P202
IC-207
P203
P208
P206
P209
P207
P204
P205
+-
IC-207
(RS-422 circuit)
P-203
(external +5V)
P-202
(interface select)
P-204 to P-209
(comm. straps)
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