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Chapter 7: Programming 7-15
IBM 468x/9x Port 4B (HHBCR) – Hex 4 tag
All models of the NCR 7870 support the IBM 468x/9x format and use
the same protocol found on IBM terminals. The scanner uses terminal
port 17 and the select address is set to 4B. Use this protocol with the
hand held bar code reader.
If your unit is a scanner/scale, the IBM address default setting is 6E,
but can be programmed to 6A or 6B. The IBM terminal integrated
scanner/scale driver normally uses address 6E. However, if the
scanner works but the scale does not, try using the other two scale
addresses. Use the Hex 4 tag to enable this protocol.
RS-232 – Hex 5 tag
RS-232 is used to connect the scanner or scanner/scale to almost any
RS-232 type of communications device. This protocol uses 7-bit ASCII
to send tag and scale data to the device. Use the Hex 5 tag to enable
this protocol.
OCIA Single Cable – Hex 6 tag
The OCIA Single-Cable scanner/scale format is the format normally
used in supermarkets to talk to an NCR 7870 Scanner/Scale. Since this
format supports 7-bit data, it can accommodate the alphanumeric data
found in the Code 128 and Code 39 bar codes, provided the system
software also support those codes. Use the Hex 6 tag to enable this
protocol.
OCIA NCR Dual Cable – Hex 7 tag
The OCIA NCR Dual Cable configuration uses two separate cables for
the scanner and scale. The data protocol is the same as in OCIA NCR
Short. This dual cable communications scheme is used on older NCR
terminal systems such as 2557 and 2126 systems. This format can
accommodate only 5 data bits per character and supports only
UPC/EAN bar code data. Use the Hex 7 tag to enable this protocol.