2.6. INTERFACE BOARD
IC1 on the interface board controls the drive components as directed by con-
trol signals received from the host fax machine. It also monitors the sensors
in the unit and controls the LEDs to notify the users of any errors. IC2 is the
motor driver.
The host fax machine controls the paper feed unit(s) through a serial inter-
face. The fax machine sends the control signals to the installed paper feed
units one by one. Each paper feed unit then controls its drive components
and/or responds with sensor status signals to the host fax machine.
Two logical signals (DEF0 and DEF1) are used to identify how many paper
feed stations the unit is assigned. The cassette ID creation circuit gives a
unique number to each paper feed unit as shown in the following table and
as illustrated on the next page.
INSL1
INSL0
DEF1
DEF0
Cassette ID
1st optional PFU
High
High
Low
Low
00
2nd optional PFU
Low
Low
Low
High
01
3rd optional PFU
Low
High
High
Low
10
4th optional PFU
High
Low
High
High
11
Up to four optional paper feed stations can be identified using these signals.
However, the number of optional paper feed stations which can be installed is
limited by the host fax machine’s specifications. As an example, the H526
models can have only one optional paper feed unit, while the H515 models
can have up to two optional paper feed units.
IC2
IC1
(CN6-6) BB
(CN6-3) AB
(CN6-2) +24V
(CN6-1) A
(CN6-4) B
(CN6-5) +24V
M
Paper Feed Motor
24V
24V
Paper Feed Clutch
(CN5-2) +24V
(CN5-2) Clutch On [
t
24V]
CL
+5V
+5V
Relay Sensor
Paper End Sensor
Paper Size Sensor
(CN3-2) Paper End [
t
5V]
(CN3-3) Paper Present [
t
5V]
(CN3-5) +5V
(CN3-4) COM1
(CN3-1) COM1
(CN3-7) COM1
(CN3-9) Paper Size 0 [
t
5V]
(CN3-6) Paper Size 2 [
t
5V]
(CN3-8) Paper Size 1 [
t
5V]
Cassette
ID
Creation
(CN1-11)
INSL1
(CN1-12)
INSL0
(CN2-2) OUTSL1
(CN2-1) OUTSL0
(CN1-6) Serial Data (Incoming)
(CN1-8) Serial Data (Outgoing)
(CN1-7) Serial Clock
(CN1-9) Latch Signal
(CN2-5)
(CN2-4)
(CN2-6)
(CN2-7)
+5V
(CN4-1) +5V
(CN4-2,3,4) LED On [
t
5V]
LEDs
+5V
+24V
H110D501.wmf
August 2nd, 1995
DETAILED SECTION DESCRIPTIONS
INTERFACE BOARD
7
