IBM 3741 Data Station Reference Manual page 87

Binary Synchronous Communications Summary
Figure 43 summarizes the functional capabilities of binary synchronous communications for the 3741 Models 2 and 4.
Function
Mode
I
R
T P B D J
K
I
Transmit:
Non-transparent Data N/A Yes No
Yes
No
Yes Yes Yes
Transparent Data N/A
No Yes No Yes No No
No
Record Length N/A
~128 ~128
~128 ~128 ~128 ~128 =128*
Block Length N/A
~128 ~128
~128 ~128
~512** ~512**
~128
Records Per Block .. N/A 1 1
1 1
>1
>1 1
Selected Records N/A No No
No No Yes
Yes No
Selected Fields N/A
No No No
No Yes Yes No
From Two Disks N/A
Yes Yes
Yes Yes Yes Yes No
Multiple Data Sets N/A Yes
Yes Yes Yes Yes
Yes No
Receive:
Non-transparent Data Yes N/A N/A
Yes Yes N/A
Yes Yes
Transparent Data
Yes
N/A
N/A Yes
Yes N/A Yes
Yes
Record Length
~128
N/A
N/A ~128
~128
N/A
~128
=128*
Block Length Excluding
I RS Characters
~512**
N/A N/A
~512** ~512**
N/A
~512
~512
Records Per Block
~1 N/A N/A
~1
~1 N/A
~1 ~1
Selected Fields
Yes N/A N/A
Yes Yes N/A Yes N/A
On Two Disks
Yes
N/A N/A
Yes Yes N/A
Yes N/A
Multiple Data Sets
Yes
N/A N/A
Yes
Yes
N/A
Yes N/A
Print After Receive:
No Format Control Yes N/A N/A
Yes Yes N/A
Yes
N/A
Data Steam Format Yes N/A N/A
Yes Yes N/A
Yes N/A
Manual Format Select Yes N/A
N/A
Yes Yes N/A
Yes N/A
Record Format Select Yes N/A N/A
Yes Yes N/A
Yes
N/A
N/A = Not applicable
* Records written to disk are always 128 characters.
(If
less than 128 characters are received, the record is padded with
blanks.)
**Systems without the EBSCA feature can only transmit and receive block lengths up to 128 characters.
Figure 43. Binary Synchronous Communications Summary
Communications 81