NCR 7870, User Manual, Page: 180 / 228

7-64 Chapter 7: Programming
Host Access to Tallies
The host can send Long Format Codes, Short Format Codes, RS-232
Format Codes, and IBM 4683 Format Codes to read the scanner tallies.
The following table shows the Long Format Codes and the RS-232
Format Codes to use.
Tally Long Format Codes: OCIA and Single-Cable
Scanner/Scale OCIA RS-232 Codes
C1 00H, 33H, 3DH, 32H, 31H 33H, 3dH, 32H, 31H
C2 00H, 33H, 3DH, 32H, 32H 33H, 3dH, 32H, 32H
C3 00H, 33H, 3DH, 32H, 33H 33H, 3dH, 32H, 33H
C4 00H, 33H, 3DH, 32H, 34H 33H, 3dH, 32H, 34H
C5 00H, 33H, 3DH, 32H, 35H 33H, 3dH, 32H, 35H
Note:
Parity, BCC, and so on, appropriate to the communication
protocol must be added.
Examples of Host Access to Tallies
Example 1
16823
30H b3H 3dH 32H b3H 8fH
30H 33H 3yH 3xH 3xH 3xH 3xH 3xH 3xH 3xH BCC (with EOM Bit)
The NCR 7870 response to the host request.
Host requesting tally C3 through single-cable OCIA.
Decimal digit with high order digit sent first
Tally count number
Block Check Character - an exclusive OR of all previous bytes
Presence of BCC specified by protocol
x =
y =
BCC =