Table 5.4: MOS-1121Y-1401E Terminal Resistor Settings
6.1 RS-232 Signal Wiring
Since the RS-232 interface is not strictly defined, many devices have their own connection methods which may
ignore some signal lines or define reserved lines for
other functions. It is best to refer to the user’s manual for your
device for installation instructions. You may find the following helpful.
In general, DTE (Data Terminal Equipment) refers to the device that is leading the communication. Examples
include PC’s, terminals and some printers. DCE refers to the device being communicated with or controlled.
Examples include modems, DSU
’s (digital service units), printers and lab/factory equipment.
In some situations you may be able to get by with just three lines: data on TXD, a signal ground and a handshaking
line. Examples are printer or plotter connections, troubleshooting and situations where you require only one-wire
communication.
Table 6.1 Terminal or PC (DTE) Connections
6. Wiring
MOS-1120/MOS-1121 User Manual 7
