1210 External Connectors, 6890A and 6890 Plus
RS-232
8 of 14
Jun 2001
Electrical
Agilent 6890 Gas Chromatograph Service Manual
Signal descriptions
Data Carrier Detect—is connected to a general purpose input on the
SC26C92. Currently, there are no plans to use this signal.
Receive Data
Transmit Data
Data Terminal Ready
—will be set ON when the 6890 GC is ready for
communications (self-test complete).
Digital Ground
—is tied to the digital signal ground on the mainboard.
Data Set Ready
—is connected to the SC26C92. Not currently used.
Request to Send
—is set ON when the 6890 GC to the host when HARDWARE
flow control set. If flow control is configured for XON/XOFF or NONE, RTS
will stay ON. If HARDWARE handshake is configured, RTS is used to inform
the host that the 6890 GC is ready to communicate and there is room in the
data buffer for data. RTS will follow the same logic as XON/XOFF for pacing
data.
Clear to Send
—is used for pacing data from the 6890 GC to the host when
HARDWARE flow control is set. When CTS is sensed in the OFF state,
transmission will be suspended. If flow control is set to XON/XOFF or NONE,
DSR will be ignored.
Clear to Send
—Not currently used.
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