Citizen Systems CBM-291 user manual Data receiving control, Rxd

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7.5 Data receiving control

When DTR/DSR control having been selected, with BUSY signal at "LOW", data from the host side are received. With the signal at "HIGH", they can not be received.

When DTR/DSR control not having been selected, after X-ON transmission, data is received from the host side. No transmission of data can take place after X-OFF is transmitted.

7.6 Buffering

Data transfer to the input buffer include DTR signals and TD signals as the control signals

concerned.
(1)	DTR signals (See 7.2. (2).)
(2)	TXD signals (See 7.2. (3).)

7.7Electrical characteristics

(1)RS-232C Circuit

Input (RXD, DSR)

<Printer side>

<Host side>

RXD	Mark = (-8V) : Stop bit
MAX 232 equivalent	Space = (+8V) : Start bit
Output (DTR, TXD)

MAX 232 equivalent
DTR (-8V) : When busy	TXD Mark = (-8V) : 1
(+8V) : When ready	Space =(+8V) : 0

CITIZEN

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Contents User’s Manual Important safety instruction Citizen Citizen Citizen Precautions for installation Citizen Ordinary Maintenance Contents Date configuration Outline FeaturesPackage Model classifications Basic SpecificationsUL, CUL, TUV EMI SpecificationsContents Code 39, Code 128, CodabarPrinting position Position of printer head and auto cutter Specifications of Roll paper Recommended paperSpecified Power Supply Citizen Rack mounting OperationConnecting a cable for power supply and interface Paper feeding Opening/closing front coverAuto paper loading function Setting roll paperPE and Mechanical alarm Removing paper jam and canceling cutter lockSelf print function Citizen Dip switch setting Function of each connector pins Connecting connectorError Explanation of input / output signals PrecautionsParallel Interface Electrical characteristics Data receiving control Timing chartBuffering Serial Interface Explanation of Input / Output signals Error detection Date configurationRXD NOP Command LitPrint Control Function Control Function CodeValue BIT Function Command DetailsExample Vertical Direction Horizontal Direction Mode NO. of Dots DOT DensityCitizen Character SET Drawer kick No pin BIT Function ValueSpecifying inverted characters UPC-A UPC-E JAN13 EAN JAN 8 EAN Code ITF Codabar NW-7 Citizen Mode Name DOT Density Position Citizen International Character TableInternational Character Code Table Appendix 1. Block Diagram Appendix 2. Outer Appearance