In the RS-232C interface the signal RTS corresponds to Clear
To Send (CTS), and this signal is used to control the Programmable
Communication Interface 2651.
If the printer uses pin 20, Data Terminal Ready (DTR) for
control, then the kit K213 may be used without further modifi
cation.
Printers that use other pins for control (2, 11, 13, 19) require
either a change to the cabling, or a special intermediate connecting
cable.
PRINTER FAILS TO PRINT
1. Check software strapping (CONFIG)
2. Check strapping of Jl, J2 on RS-232C interface board
3. Check printer strapping
4. Check pin 5 (RTS) is on, +12V
5. Monitor interface with an oscilloscope or a digital analyser
INCORRECT PRINTING
In the X On — X Off mode, check:
1. Pin 20 (DTR) is on (+12V)
2. All strappings
3. Connect a bridge between TB1-4 and TB1-8 on the RS-232C
interface board
4. Monitor interface with an oscilloscope or digital analyser
In other modes of operation check if TB1-8 (CTS) on the
RS-232C interface board changes state when the printer buffer
is full. If TB1-8 does not change state, connect this pin to the line
that provides the printer buffer status.
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