HP 13255 Manual

HP 13255
GENERAL PUPPOSE ASYNCHRONOUS DATA COMM MODULP.
Manual Part No. 13255-91089
PRINTED
AUG-Ol-76
DATA TERMINAL
TECHNICAL INFORMATION
HEWLETT ~ PACKARD
Printed in U.S.A.

13~55
General Purpose Asvnchronous DatA Comm MOdule
1.0 INTRonUCTIO~.
13255-91089/02
Rev AUG-01-76
The General Purpose Asynchronous Oata Communications Module provides a
qen~ral purpose EIA RS232C or 20 rnA de current loop link from the ter-
ro~nal to ary eiterna1 device. The GP Async Data Comm peA transwlts and
receives bit serial data to and from the external device through an
interface cable assemblY, provides 6arallel-to-serial and serial-to-
par~llel conv~rsi~n, and transmits anrl rece~ves bit parallel data to
and from the terminal t~rough the Backplane Assemblv (data bus). Refer
also to the O~eratinQ and Service Manual (HP Part NO. 02640-90042) for
additional in~ormatlon. Parts lists for 02640-60043, 02640-60058,
02640-60059, 02640-60077, 02640-60131, and 02645-60002 arP contained
In module section 13255-91086.
2.0 OPERATING PARAMETERS.
A summary of ~peratlng parameters for the GP Asvnc Data corom Module is
contained In tahles 1.0 throuah 6.5.
Table 1.0 Physical Parameters
================================================================================
Part
Number
--- ... ---------
------~ ... -----
02640-60043
02640-60058
02640-60t)59
02640-60077
02640-60089
02641)-60097
02640-6009A
02640-60099
02640-60131
02645-60002
02645-60003
Size (TJ x W x D)
Nomenclature +1-0.100 Tnches
----~----~--~---~-~---~~~---~- -~------~--~----~---~--
----------~-~-~-----~--------~ -------------~---------
103/102 Cable Ass'v
12531/12880 Cable ASs'y
RS232C Cable ~ss'v
T~st Hood Asembly
GP Asvnc Da~a Corom PCA
Current Loop Cable ASs'y
RS232C Cable (Male) A~S'v
RS232C Cable (Female) ASS'y
US Modem Cable ~SS'y
DC Self Test Hood
Current Loop Self Test Hood
N/A
N/A
N/A
N/A
12.9 x 4.0 x 0.6
N/A
N/A
N/A
N/A
N/A
N/A
Weight
(Pounds)
.......... _-- ....... -
- ..... -- ... ---
N/A
N/A
N/A
N/A
0.50
N/A
N/A
N/A
N/A
N/A
N/A
==============================================================================
Number of Backplane Slots Required: 1
================================================================================

HP 13255
GENERAL PUPPOSE ASYNCHRONOUS DATA COMM MODULF.
Manual Part No. 13255-91089
PRINTED
AUG-Ol-76
~------~~~~-~---~-~-------~------~~---~---~--~---~-----------~------
The lnformation contained in t~is document is suhject to chanqe
without notice.
HEWL~TT-PACKARn MAKES NO WARRANTY nF ANY KIND WITH RF.GARO TO THIS
MATEPIAL, INCLUDING, BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF
MERCHA~TABILITY AND FITNESS FOR A PARTICULAR PtJFP05E. Hewlett-PaCkard
shall not be liable ~or errors containpd herein or for incidental or
consequential damaaes in connection with the furnishinq, performAnce,
or use of this material.
This document contains proprietary information w~ich is nrotected by
copvriaht. All riqhts are reserved. ~o part of this document may be
photocopied or reproduced without the orior written consent of H~wlett
Packard company.
--------------------------------------------------------------------------------
Copvriqht c lq76 bv HEWLETT-PACKARD COMPANY
NOTE: This dOCtlment is part of the 264XX DATA TERMINAL product
series Technical Information Packaae (HP 13255).

13?55
General Purpose Asynchronous DatA Comm MOdule
1.0 INTRonUCTJON.
13255-91089/02
Fev AUG-01-76
The General Purpose Asynchronous nata Communications Module provides a
qen~ral purpose EIA RS232C or 20 rnA de current loop link from the ter-
ro~nal to ary e~ternal device. The GP Async Data Comm PC~ transroits and
receives bit serial data to and from the external device through an
interface cable assemblY, provides ~arallel-to-s~rial and serial-to-
parallel conversi~n, and transmits and rece~v~s bit parallel data to
and from the ~erml~al t~rouqh the Backplane Assemblv (data bus). Refer
also to the OperatlnQ and Service Manual (HP Part NO. 02640-90042) for
additional in~ormation. Parts lists for 02640-60043, 02640-60058,
02640-60059, 02640-60077, 02640-60131, and 02645-60002 are contained
In module section 13255-91086.
2.0 OPERATING PARAM~TF.RS.
A summary of ~peratlng parameters for the GP Asvnc Data Comm Module is
contained in tables 1.0 throuah 6.5.
Table 1.0 Physical Parameters
================================================================================
---------_ .... _-
------------- ......
02640-60043
02640-6005R
02640-60059
02640-60077
02640-60089
02641)-60097
02640-6009R
02640-60099
02640-6013t
02645-60002
02645-60003
Nomenclature
---~-~---~--~-----~--~-~~-----
---------~~-~-------~---~-----
103/102 Cable ASs'y
1'531/12880 Cable ASs'y
RS232C Cable ~ss'y
T~st Hood Asembly
GP Async Da~a Corom PC~
Current Loop Cable ASs'y
RS232C Cable (Male) ASS'y
RS232C Cahle (Female) ASs'v
US Modem Cable ASs'y
DC Self Test Hood
Current Loop Self Test Hood
51 ze (TJ X W x n)
+/-0.100 Tnches
-~------~----~--~---~--
----~-~--~---~---~-----
N/A
N/A
N/A
N/A
12.9 x 4.0 x 0.6
N/A
N/A
N/A
N/A
N/A
N/A
Weight
(Pounds)
-------_ .. -
--~------
N/A
N/A
N/A
N/A
0.50
N/A
N/A
N/A
N/A
N/A
N/A
===========================:===========:======================================
Number of Backplane Slots Required: 1
====================================:===========================================

13255
General Purpose Asvnchronous Data Comm Module
13255·Ql089/03
Rev AUG-01-76
Table 2.0 Reliabilltv and Fnvlronmental Tnfo~matlon
================================================================================
Environmental:
( X ) HP Class B ( )
nther:
Restrictions: Type tested at product level
==============================================================================
Failure Rate:
1.502
(percent per 1000 hours)
--~-~-~-------~~--~~~---~---~~--~-----~-~-~~----~----------~--------------------
----------------~----------~--~-~-------------------------~--~------------------
Table 3.0 Power Supply and ClOCK Requirements - Measured
(At +1-5% Unless othp.rwise Specified)
~---~.----------------------------~--~--~~------~---------------~~-----~~--~----
-~~---------~---~---~-----~~----~---~-~------~-~-----------~---------~------~--
... 5 Volt SupplY +12 Volt Supply
-1'2 Volt Supply
-42 Volt Supply
If 300 rnA fa 40 mA
~ 20 iliA
@
NOT APPLICABLE
====================================== =======================================
115 volts ac 220 volts ac
A A
NOT APPLICABLE
-~~-,-------------~----~-~--~---~---~--~-----~--~----------------~-------------
-~--.--------~----------------------------~-~-------------------~-~------------
ClOCK Frequency:
4.915 MHz
=====.===========================================================================

1325'5
General Purpose Asvnchronous Data Comm Module
13255-91089/04
Pev AUG-01-76
Table 4.0 Switch DefinItions
================================================================================
PCA Function
Deslqnatlon
================ =:==:=:===:=:::==:==:====::::=::=::::::::::::::=:::::========
Alt,A10,A9,A4
Feo thru FC7
C~E
BO thru Btl
SO,51,52
134
RHE
1A1
Module Address Selection (see section 4.0)
Firmware Control Word - Function deoends on
firmware apolication
Custom Raud RAtp Enable
Closed -The custom baud rat~ qenerator is
enabled when the haud rate switCh
is in the EXT position
Open -The custom haud rate generator is
disabled
Custom Baud Rate Selection (see section 4.1)
SplIt Baud Pate Selection (see section 4.2)
134.5 BAUd
ClosPd - Enable 134.5 baud and 6-bit data
word when baud rate switch is in
150 position
Open - DISAble 134.5 baud
Two stop Bits
Closed - Transmit and receive data with two
stop hits at all baud rates.
npen - Transmit and receive data with one
stop hit at all_haud rates excent
110 (two stop bits)
Transmit ~andshake F.nable
Closed - Ena.~l e t ran sm 1t handshake c 1 reu 1t
open - Disable transmit hand5h~ke circuit
Receive Handshake Enable
rlosed - Enable receive handshake circuit
bpen - Disable receive handshake circuit
Inhibit AT'"
Closed - Disable Data Comm Intprru~t from this module
np~n - Enable Data Comm Interrupt from this module
---~~-------~---~---~-------------~---~-~---------------------~-~-----~--~~--~--
------------------------------------------------------ -------~-------------------

'!)r;
1325S,
General Purpose Asynchronous D~ta Comm Module
13255-91089/05
Pev AUG-Ot-16
Table 5.0 Con~ector Information
--~--'--~-----~~---~~-----~~-~-~-~-~~~~~~------~~~-~------~-------~~---~~--------
-----'~----------~-----------~~-------------------------------~------------------
Connector I
and pin NO. I
--- ... -------~ .... -
----,-----_ .... _- ....
Pl, Pin 1
-?
-3
-4
-6
-7
-8
.q
-10
-11
-12
·13
-t4
-15
-16
Pin ·,11
throuah
Ptn -20
-21
-22
Siqnal
Name
------~---------
------------~-~-
... sv
GND
SYS CLK
-12V
ADORO
~DOR2
ADDR3
ADOF4
~DOR5
ADDR6
ADORQ
ADDR11
1/0
GND
Siqnal
Description
==============================================
... 5 Volt Power Supply
Ground Common Return (Power and Siqnal)
4.915 M~Z System ClOCK
-12 Volt Power SUDPlv
Negative True, Address Sit 0
Not Used
Negative True, Address Bit 2
Neq~tive True, Address Bit 3
N~qative True, Address Rit 4
Negative True, Address A1t 5
Neqative True, Address Rit 6
}
} Not Used
}
Negative True, Address R1t q
,
I N~qattv~ True, Address Ait 10
,
, Neqativp- True, Address A1t 11
,
,}
I} Not Used
I }
,
I Neqattvp True, TnDut nutput/Memorv
,
, Ground Common Return (Power and Sional)
====::=======================:===================================================

13255
General Purpos~ Asynchronous Data romm MOdule
13255·9108Q/06
Pev AlJG-01-7b
Table 5.0 Connector Information (Cont'd.)
=====:=========-=================================================================
Connector
and Pin No.
- -. - --- ------- --
--.-.-----------
P1, Pin"
-c
-n
-E
-F
-.1
-J<
-"1
.p
-s
-T
-n
-v
-w
-x
-y
-z
Signa] Siq~al
Name 1 Description I
================1==============================================
GND I Ground Common Return (Power and Sln.nal)
,
+12V
PWR ON
BUSO
RUSt
~US2
RUS3
RUS4
~US5
BUS6
RUS7
WRITF.
PRIOR IN
PRYOR OUT
REO
ATN
1 Not Used
,
System Power
On
Neaative True,
Data
Bus
Bit
0
Neaatlve
Trup,
Data RU5 Ait 1
~leaat 1 ve
True, Data
Bus
Pit
2
Neaative
True, Data
Bus
Bit 3
Neaatlve
True, Data Bus Bit
4
NeQatlve
True, Data Bus
Ait
C;
Neaative True, Data Bus
~lt 6
Neqatlve
True, Data Bus BIt 7
Neaative True, WrIte/Read
Type
Cvcle
•
} Not Used
}
Bus Controller
Pr lori. tv In
Bus Controller
Prloritv
Out.
}
}
} Not
used
}
}
NeQative True,
Request
(Bus nata
Currently Valid)
Neqatlve
True,
Data
Comm
Interrupt Request
================================================================================

13255
General Purpose Asvnchronous DatB Comm Module
13?55-Ql089/07
Pev AtTG-01-76
Tahle 5.1 Connector Information
================================================================================
conn~ctor
and Pin NO.
------ ... ------- .......
_... _----_ ... -------
p2, pin t
- 2
- :3
- 4
- 5
- 7
.. 8
- q
-10
-1t
-12
-13
-14
-15
Siqnal Siqnal
Name 1 Description
================1==============================================
t
I
ENCL I Neaative True, Current LOoP F.nable
,
INT NeQatlve True, Invert Current Loop
Pece.l ved Data
CL+t2 Power Source for Current LOop
Active Receiver
CL+ Current toop Peceiver Positive Input
CL- Currpnt LOop Receiver Neaative Input
eLA Current Loop Transmitter Current
Sourcing Terminal
CLP Curr(o'nt T,oop Transmitter Current
Sinking Terminal
INn Neqative.True, Invert Current Loop
Transmitted Oata
PON Power On Clear
TSB Neqative True, Invert the Sense of SA
XECL Programmable Control Siqnal
TTYTN Teletvpe Current LOoP Receiver Input
}
} Not Used
}
TEST 9650 Test Point
================================================================================

13255
General Purpose Asynchronous Data Comm Module
1.3255-91089/08
Rev AUG-Ot-76
Table 5.1 Connector Information (Cont'd.)
============================================================.====================
Connector
and pin NO.
... ~ .... ------------ ...
----- .. _----_... -
P?,
Pin
A
-B
-r
-n
-€
-F
-H
-,-T
-I(
-L
-M
-N
-p
-p
-s
Slqnal
Name
----------~-----
----------------
GND
SA
BB
CA
CB
eNO
CI"
X8 nUT
X16 OUT
SA
S8
CD
X16 TN
Siqnal.
Description
==============================================
Slonal Ground
Transmitted Data Out
Received Data tn
Reauest to Send
Clear to Send
Not Used
Sianal Ground
Carrier Received
Clock of 8 X the Transmit 8aud Rat~
Clock of 16 X the Transmit Baud Rate
secondary Channel Transmitted nata
Secondary Channel Received Data
Data Terminal Readv
~lot Used
Clock of 16 X the Receive Raud Fate
==========================:=====================================================

13255
General Purpose Asynchronous Data Comm Module
13255-91089/09
Rev AUG-Ot-76
Table 6.0 Module Rus Pin Assiqnments
=====::====================================:=====================================
Function
Performed: Output Data Character for Transmission
Poll Bit: Not Applicable
Module Address: (ADOR 11,tO,9,41 = (A11,AtO,A9,A4)
Switch Selectable (OOOt)=Data Comm
(Ot01)=Printer
Function SDecifier: AnDR5 = 1
ADDR6 =1
Data BUS Bit Interpretation:
R7
Data Output Bft 7
- 86
Data Output Bit 6
Data Output Bit 5
A4~
Data Output Bit 4
Data nutput Hit 3
B
'-'
4. DAta
nutput Bit 2
B1.
Data Output Bit 1
RO
Data Output Bit 0
I Bus
,
Value
Siqnal
-------
-- .. ---.~ .. ----
--------
.... -----~-- ... -
X ADOR
15
X
ADOR
14
X
AOOR
13
X
ADT)R
12
All
AOOR
1t
AIO
ADDR
10
A9
ADDR 9
X ADDR 8
X ADOR
7
1
ADDR 6
t
ADOR 5
.A4 ADDR 4
X
AOOR
3
X
ADOR
2
X
ADOR t
X ADDR
0
_ .... _--- -------------
-- ..... ---
---- .. --~-- ...... --
67
BUS 7
86
RUS
6
85
BUS
5
84
AUS
4
A3
AUS
3
82
AUS
2
8t
PUS
t
80
BUS
0
--~-~----~----------
--~-----------------
l=Logical l=Bus Low
O=Loqical O=Bus
High
X=Don't
Care
----~------ .. ---------
----~-~-------------~
=====::==:=========:=============================================================

1315C;
General Purpose Asynchronous Dat~ Comm ~odule
13255-9108
Q
/I0
Rev AHG-Ol-76
Tabl~ 6.1 Module Rus Pin Assianments
================================================================================
Function
pertorme"':
Poll Btt:
Read Ffrmwar~ Control Word
(Fe Switches)
Not APplicable
Module Address: (~DOR 11,10,9,4) = (Atl,A10,A9,A41
Switch Selectable (OOOl)=Data Comm
(OIOl)=Printer
FUnction Specifier: ADOR5 = 0
ADDR6 = 1
nata Bus Bft Interpretation:
P.7 Swttch FC1
o = Switch Closed
1 = Switch Open
B6 5wit~h Frb
o = Switch Closed
t = SwitCh Open
B5 switCh FrS
o = Switch Closed
1 = Switch Open
84 SwitCh Fr4
o = Switch C~osed
t = Swltcn Open
R3 SwitCh FC3
o = Sw~tCh Closed
1 = Switch Open
R2 Swltch .. FC2
o = Switch C~ose~
t = SwitCh Open
B1 switCh Fel
o = SwitCh C1.osed
1 = SwitCh open
BO Sw 1 tCh_. FCO
o = Switch Closed
1 = SwitCh Open
Bus
I
Value
Slqnttl
1------- -
.... ~---------
-------
-- ... ---~-----
I X ADOR
15
, X
ADDR
14
, X
ADOR
13
X
ADOR
l'
Atl ADDR 11
AtO
ADOR
10
Aq
ADDR
q
X
ADDF 8
X
ADOR
7
1
flDOR
6
0
ADDR
5
A4
ADOR 4
X ADOR 3
X
ADDR
2
X ADDR 1
X ADOR
0
- ... ---,.. ...
~--- ... ~------
---.-,--- ...----_-._------
87
RUS
7
R6
RUS
6
B5
BUS
5
B4
PUS 4
B3
RUS
3
8"
BUS
,
B1
BUS
t
flO
RU5
0
-----~-~-------~----
-----~---~-~~----~--
I=Loq~cal l=Bus
Low
O=Logical
O=Bus
High
X=Don't Care
------~~----~-----~--
------------~-----~~-
----------------~--------~--~-----------~-------~-~-------~-~-------------------
-------------------------- ... ---~-----------------------~-----------------~-----~-

13255
General Purpose Asynchronous Data ro~m Module
13255-910SQ/tl
Rev AUG-Ol-76
Tahle 6.2 Module Bus Pin Assiqnments
-====;:======================:===================================================
,
,
I
t
I
,
I
I
I
I
I
I
Function
I I Bus
pertorme~: Input Module status Byte
I
Value
I
Siqnal
-------
... -----------
----- ... ~
----~--- ... ---
X
ADDR 15
Poll Bit: Not Applicable
X AOOR
14
X
AODR
13
Module
Address: (AODR 11,10,9,4) = (Atl,AtO,A9,A4)
X
AonR
12
Switch Selectabl~ (OOOl)=Data Comm
("101)=Prlnter
Function 50eclfier: ADOPS = 1
ADDR6 =0
AO = 0 Read Standard status
AO = 1 Read Alternate 5tatus
nata Bus Bit Interpr~tation:
Alternate status Is the same as the
standard status unless noted otherwise
~7 Not Used
Bib 0 = 58 On
1 = SR Off
RS 0 = C,", On
1 = C8 nff
B''l
S.)
s:l
Ai
810
0 =
CF On
1 =
CF
Off
0 =
NO parity
Error
1 =
P~rltv Error
0 = NO
Overrun
Error
1 = Overrun Error
o = Transmit Hold~nq Reqister Full
1 = Transmit Holdino Reaist~r Empty
o = Receiver Req~ster Empty
1 = Receiver Reqister Full
At 1
AOOR
11
AtO
ADnR
10
A9 ADOR
9
X
ADDR 8
X
ADOR 1
0
AOOR
6
1 ADOR
5
A4
AOOR
4
X
ADOR
3
X
ADOR
2
X
ADDR
1
AO ADOR
0
--- .. --- -------...
---~
-------
---- .. -... -----
87
BUS
7
86
BUS
6
85
AUS
5
84
AU~
4
83
BUS
3
B2
AUS
2
B1
PUS 1
BO
8US
0
~----~-~-~----~-~---
-------~--------~---
l=Loqical
l=Bus LOw
O=Loqical
O=Bus
High
X=Don't Care
------~---~----~~----
---~--~-~~-~---------
(Alternate)
o = Transmission in
Proqress
1 = Transmission Complete
=====:================================================::::=:::=:=::::==:=:=::=::=

13255
General Purpose Asvnchronous Data Comm Module
13255-91089/12
Rev AUG-01-76
Table 6.3 Module Bus Pin Assiqnments
--~-~-~-~---~----~~---~-~---~~-~~~-~~-~~~---~-~---~-~~--~-~-~~~-----~~~--~--~---
--~~------~-----~--~----------~---~--~-----------------~-------~----~-----~-----
Function
Pertorme~: Read Rp.ceived Data Character
Poll Bit: Not Applicable
Module Address: (ADON 11,10,9,4) = (Al1,~10,A9,A4)
Switch selectable (OOOl)=Oata Comm
(OI01)=Printer
--
Function Specif.ier: ADDR5 = 0
AODR6 =0
Data Bus Bit Interpretation:
A7
Data lnout Ait 7
Ro
Data Jnput Bit 6
RS Data Input Bit 5
84 DatA
Jnput Rit 4
83
O~ta Input Rit 3
82
Data Tnput Ait 2
~1
Data Tnout Hit 1
AO
Data Input Bit 0
Bus
Value 5iqnal
--- ... - ... -
----- ... --~-----
-------
--_ ... _ ..... -----
X
ADDR
15
X
ADOR 14
x. AOOR
13
X ADOR
12
Atl
ADOR
11
A10 ADOR 10
A9 ADDR 9
X ADOR
8
X
ADOR 7
0 ADDR
(,
0 ADOR
5
A4 ADOR 4
X ADOR 3
X
ADOR 2
X
ADDR 1
X ADDR
0
------ ...
--.- .. ----~- ... --
-~- ... ---
-- .... ---------
87
BUS
7
86
BUS
6
85
AUS
5
64
BUS
4
63
BUS
l
B2
BUS
,
B1
BUS
1
BO AUS 0
-----~-----------~--
---------~------~---
l=[,oqjcal
l=P.us LOw
O=IJooical O=Bus
Hiqh
X=Don-t Care
~-------------------~
---------------------
================================================================================

13255
General Purpns~ AsynChrOnous Data romm Module
Table 6.4 Modul~ Bus PIn Asslqn~ents
13255-91089/13
Pev AUG-01-76
================================================================================
Function
performert: nutput Control Reqister Rits
Poll Bit: Not ApplIcable
Module Address: (ADOR 11,10,9,4) = (Al1,A10,A9,A4)
Switch Selectable (0001)=Data Comm
(010l)=Printer
Function Soecifier: AOOR5 = 0
AODP6 = 1
Data BUS Bit Interpretation:
87
Not Used
Sb
0 =
No Break
1 = Break:
B5
0 =
Enahle
Parity
,
Valu~
-~- .. - .. -
-------
X
X
X
X
Atl
AtO
A9
X
X
1
0
A4
X
X
X
X
... ------
------_ ... -
87
B6
BS
B4
Bl
B2
B1
80
Bus
5iqnal
.... _ ...... ----------.
-----_ ... -----
ADDR
15
ADOR
14
AODR
13
ADOR
12
ADOR
11
AOOR
10
AOOR
9
ADDR
8
ADOR
7
AOOR
f'
ADOR 5
AOOR
4
ADOR 3
ADDR
2
AOOR
1
ADOR
0
... ---_ .... __ .. --
----_... _- .... -... -
BUS
7
BUS
6
BUS 5
BUS 4
BUS
3
AUS 2
BUS 1
BUS 0
1 =
Inhibit
Parity
- .... ---~-~~----~---~-~
--~--~~-----~~~-~-~-
I=Loqical
1=8us LOW
o=Loqical
O=Bus High
R4 0 = Odd
Parity
X=Oon·t Care
1 = Even
Parity
~---~---~~----------~
~--~-----------~---~-
RECFIVE BAUD PATE
I_~ ____ -~-----~--------~~--------~----~-----------
tExt Clk 110 150 300 1'00 2400 4Aon 9600 I
t===============================================t
R3 • 0 0 0 0 1 1 1 t,
I I
82 '0 0 1 0 0 1 1 I
I I
R1 I 0 lot 0 1 0 1 I
80
~-----~~--~---~----~~---.~-~~-~--~-----------~--
---~----~------~~~---------~-----~---~---------~~
o = CA o~
1 = CA off
============'====================================================================

13255
Genera) Purpose Asvnchronous Data Comm MOdule
13255-91089/14
Pev AUG-Ot-76
Table 6.5 Module Pus Pin Assiqnments
================================================================================
Function
performed:
Poll Bit:
TnDut instruction to Set/Reset Data
Terminal Readv (CD) and Set/~eset
External Control siqnal (X~CL)
Not Applicable
Module Address: (AOOR 11,10,9,4) = (Atl,A10,A9,A4)
Switch Selectable (0001) = Data Comm
(0101) = Printer
Function Speclfleor: ADDP5
= 1
ADOR6
= 1
A2
=
0, XECL
=
L<?w
A2
= 1 , XErL =
Hiqh
A3
=
0, rD
On.
1\3
= 1,
CO
Off
nata BUS Bit Interpretation: Not Apolicable
Bus
Value Signal
_ ............ _-
-- ..... - .. _-_ ... ---
----.-.--
------------
X
ADOR 15
X ADOR
14
X ADDR 13
X
ADOR
12
Atl ADDR 11
A10 ADDR 10
A9 ADDR 9
X
AOOR
R
X ADOR
7
t
ADOR
6
1
AOOR
5
A4 ADOR 4
AJ
ADnR 3
A2
ADOR
?
x
AOOR
1
)(
ADf)R
0
-------
------ ... -_ ... --
--------
------------
B7
RUS 7
86
BUS
6
85
BUS
C;
B4
BU~
4
B3
BUS
3
B2
AUS
?
81 ~US
1
80
BUS 0
--------------------
--------~--~~---~---
l=LoQical
l=Bus
Low
O=Loqlcal O=BlJS
High
X=Don·t Care
~-~---~--~---~--~----
---~--~--------------
~-------------------~-------~-~----~~---~--~~~-------~--------~----~---~--~----
-----------------------~~---------------~---------~--------~--------------------

13255
General Purpose Asynchronous Data Comm Module
13255-91089/15
~ev AUG-Ot-76
3.0 FUNCTIONAL PESCRIPTION. Pefer to .the block diagram (fiQure_1),
schematic d~aqra~.(figure 2), component location dl~qram (figure 3),
current loop confiqurations (figure 4), and parts lIsts (02640-60089,
02640-60097, 02640-60098, 02640-60099, and 02645-60003) located in the
aOPE'ndix.
3.1
3.t.l
3.1.?
3.2
3.2.1
The functional ~escription Of this module is detailed in blocks as
shown on the block dia~ram.
UART. The UART is an MOS/LSI device used for interfacing a serial
asynchronous data path to a parallel data path. The baud rate, number
of stop bits, and parity configuratIon Of the received and transm1tted
serial char~cters can be ~roqrammed. (For detaIls of the UART, consult
western DiqitAI's TR16028 specifIcation sheet.)
Trans~itted and received characters can have 6, 7, or 8 data bits
(excludlnQ parirv). All characters have one start bit. Ch~racters
have one stop bit unless 110 baud Is selected or the 2SB Switch is
closed, in which case two stop bits are use~. 5ii or seven-bit data
words can have even or odd ~arity. Eight-bit data words have no
paritv.
When the 134 Switch is closed and control register bits 3, 2, and 1 are
"010", then 134.5 baud, six data ~its, one start bit, and one stop bit
are selected.
1/0 INSTRUCTION Of CODER.
The 1/0 l~struction decoder is a circuit whlc~ decodes terminal data
bus sjonals into hardware control signals on the peA. Tt consist~ of
a module ad~ress decoder (U46) Rnd a 3-to-8 decoder (045). The module
address dpcoder is co~pos~d of four exclusive OR oates which can be
proorammed with switches. When the prooer module address Is oresent on
ADDR11, ADOPIO, ADOP9, and AOnR4, an enable si~nal 1.s provided to the
3-to-R decoder.

13255
General Purpose Asynchronous Data Comm Mndule
13255·Ql089/16
Rev AlJG-Ol-76
3.2.2
The 3-to-R decoder
provides
control
siqnals
to the other
functlon~l
------
---
----
_ ... _-
--
blocks. Address
lines
ADORO, AODR2,
ADDR3,
AOOR5, ADDR6, and WRITE
and
I/O
are
dpcoded
and
strobed
bY
REO to
realize
lowinq
control
~lqnals
are activated
as
shown
module address
Is
---
- ...... -
I/O WRTTr;:
AODRO
0 0 X
0 0 X
0
,.
X
0 1 1
0
,.
0
0 1 X
0 X
0 X
0 t X
0 X
selected.
---
---
AOOP2 ADDP3
X X
X X
X X
X X
X X
X X
0 X
t X
X 0
X 1
X = Don't Care
+ = Rising Edqe
_ ... - ....
---
ADOR5 AOOR6
1 0
0 0
1 0
0 1
1
1 1
0 0
0 0
0 0
0 0
control
pUlse~.
The
fo1-
whenever
the
proper
REO
t T,oad control
regis-
ter
from
data hus.
t
Load character
into
transmit
half
of
HART.
0
Gate firmware
control word
onto
data
bus.
0 Gate
status
word
onto
data hU5.
0 C:ate JTlodlfied
status
word
onto
data
bus.
0
Gate received
data
from
UAFT to
data
bus.
'Reset
UART's
Data
Ready
flip-flop
+
Set
XECL
hiqh
+ Set.
XECIJ low
+
Turn
CD
off
+
Turn
CD
on

13255
General Purpose Asvnchronous Data Comm Modul~
13255-91089/17
Fev AUG-Ot-16
3.3
3.3.1
3.3.2
3.4
3.4.1
CONTRnL REGISTER.
T~e control register Is a 7-bit latch that contains the control state
of the peA. The control hits set the parity, baud rate, and RS232C
control siqnals.
" -
rhe r~qtster Is composed of seven D-type flip-flops. Data is latched
in this reqister from the data bus. The reqister·s output controls the
R5232C control lines and programs the U~RT and baud rate oenerator.
When latched in the control register, BUS1, BUS2, and BUS3 program the
baud rate qen~rator receive multiplexer. BtJS4 and RUSS, in conjunction
with the 234 and 2SB switches, control the PI, SBS, WLS2, WLS1, and EPE
siqnal Input.s to thf» tJAPT.
BAUO RATE GENfRATnR.
The baud rate generator provides the timing for data receotion and con-
trol. It consists of two p~rts--a standard bAUd rate generator and a
custom baud rate qenerator.
The standard baud rate generator is composed of three 4-bit binarY
counters (U31, U26, and U36) and associated presettinq loaic. The
standard baud rates are deriv~d by dividing the bus Svste~ Clock to a
rate of 16 times the desired baud rate. The standard baud rates are:
110 baud (1.16 kHz), 150 baud (2.4 kHz), 300 baud (4.8 kHz), 2200 baud
(19.2 kHz), 2400 baud (38.4 k~z), 4~00 baud (76.8 kHz), and 9600 baud
(153.6 kHZ)! The counter preset function is only used when 110 or
134.5 baud Is selected.

13255
General Purpose Asynchronous Data Comm Module
13255-91089/18
Rev AUG-Ol-76
3.4.~
The select inputs of the receive baud rate multipleier (U35) are driven
bv the control reqlster. The proper X16 clock rate is selected t~
drive the UART receiver. The r~celve baud rates are selected as fol-
lows:
CONTROL
RfGTSTE'P
3 , 1 RFCF.IVE
BAUD
RATE
--------
----~------------~~-~------------~------
1 1 1
9600
1 1 0
4800
1 0 1
2400
1 0 0
1200
0 1
300
0 t 0
150
(If
134 Switch
Open)
134.5 (If
134
Switch
Closed)
0 0 1
110
0 0 0
F.xternal
ClOCK
(If
CBE
Switch
Open)
Custom
Baud
Rate
(If
CAE Switch
Closed)
The custom baud rate qenerator also consists of three 4-bit binary
~ounters (U27, "17, and U141. These counters are proarammed with 12
switches to produce the desired baud rate. The counters qet preset
when the ~C (Pin 15) output of all three counters is true. The TC out-
put of the la~t counter is aat~~ with the bus SYstem ClOCK to prevent
alltchinq and routed throuqh A O-tvpe tllo-flop to square the signal.