WOODWARD 5466-268 Servo driver module

lists the standard EIA-232-D interconnections. To interpret this information correctly, remember that EIA-232-D was intended to connect a terminal to a modem. When computers are connected to each other without modems, one of them must be configured as a terminal (data terminal equipment: DTE) and the other as a modem (data circuit-terminating equipment: DCE). Since computers are normally configured to work with terminals, they are said to be configured as a modem in most cases. Signal levels must lie between +3 and +15 volts for a high level, and between -3 and -15 volts for a low level. Connecting units in parallel may produce out-of-range voltages and is contrary to EIA-232-D specifications.

Levels of Implementation 

There are several levels of conformance that may be appropriate for typical EIA-232-D interconnections. The bare minimum requirement is the two data lines and a ground. The full implementation of EIA-232-D requires 12 lines; it accommodates: 

❏ Automatic dialing 

❏ Automatic answering 

❏ Synchronous transmission

Signal Adaptations 

One set of handshaking signals frequently implemented are RTS and CTS. CTS is used in many systems to inhibit transmission until the signal is high. In the modem application, RTS is turned around and returned as CTS after 150 microseconds. RTS is programmable in some systems to work with the older type 202 modem (half duplex). CTS is used in some systems to provide flow control to avoid buffer overflow. This is not possible if modems are used. It is usually necessary to make CTS high by connecting it to RTS or to some source of +12 volts such as the resistors shown in Figure E-1. CTS is also frequently jumpered to an MC1488 gate which has its inputs grounded (the gate is provided for this purpose).

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