UBI EasyCoder 501 – Service Manual
153
21. RS 422/485 INTERFACE BOARD, cont'd.
21.2
Straps
Communication Port "uart2:" (RS 422/485)
P-3
Selects 2- or 4-wire communication (see text on board).
P-7
Selects address for the printer (only used in RS 485
connection with "prot. addr. enable") according to the
table later in this chapter.
P-8, P-9 Voltage reference straps.
RS 422: P-8 and P-9 should be strapped on both units.
RS 485: P-8 and P-9 should be strapped on "master" unit.
Usually, the host computer is master.
P-10
100
Ω
terminating resistor. Should be strapped on the first
and last units, regardless of RS 422 or RS 485.
P-11
100
Ω
terminating resistor. Should be strapped on both
units in an RS 422 line.
Communication Port "uart3:" (RS 232C)
P-6
Co5V to pin 16 on "uart3:". Max 200 mA.
Warning! Be careful not to enable the ex5V
unintentionally, which may cause harm to the terminal,
computer or other device connected to this port!
Continued!
P6
P3
P11
S1
S2
S3
S4
S5
P10
P9
P8
MASTER
END
P7
2-WIRE
4-WIRE
5V-EXT
"uart3:"
P-9
P-8
"uart2:"
P-10
P-11
P-7
P-3
P-6
Содержание EasyCoder 501 SA
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