87
UBI EasyCoder 501 – Technical Manual
232
CL
422
"UART1:"
P202
IC-207
P203
P208
P206
P209
P207
P204
P205
+
-
INTERFACES, cont'd.
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, i.e. reception and transmission can take place simultane-
ously.
RS 422 requires an additional circuit and a number of straps to be
fitted on the CPU board:
RS 422 on "uart1:"
Continued!
RS 422 connection between host computer and printer
+ RS422 IN
- RS422 IN
+ RS422 OUT
- RS422 OUT
P-204 – P-209
(comm. straps)
P-202
(interface select)
P-203
(ex5V)
IC-207
(RS 422 circuit)