REXROTH VT-VSPA1-1-11 Analog quantity counting card

The EIA-232-D standard defines the electrical and mechanical aspects of this serial interface. The interface employs unbalanced (single-ended) signaling and is generally used with DB25 connectors, although other connector styles (e.g., DB9 and RJ45) are sometimes used as well. Table A-1 lists the standard EIA-232-D interconnections. Not all pins listed in the table are necessary in every application. To interpret the information correctly, remember that the EIA-232-D serial interface was developed to connect a terminal to a modem. Serial data leaves the sending device on a Transmit Data (TxD) line and arrives at the receiving device on a Receive Data (RxD) line. When computing equipment is interconnected without modems, one of the units 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.

Interface Characteristics 

The EIA-232-D interface standard specifies all parameters for serial binary data interchange between DTE and DCE devices using unbalanced lines. EIA232-D transmitter and receiver parameters applicable to the MVME162 are listed in Tables A-2 and A-3.1. A high EIA-232-D signal level is +3 to +15 volts. A low level is -3 to -15 volts. Connecting units in parallel may produce outof-range voltages and is contrary to specifications. 2. The EIA-232-D interface is intended to connect a terminal to a modem. When computers are connected without modems, one computer must be configured as a modem and the other as a terminal.

EIA-530 Connections

 The EIA-530 interface complements the EIA-232-D interface in function. The EIA-530 standard defines the mechanical aspects of this interface, which is used for transmission of serial binary data, both synchronous and asynchronous. It is adaptable to balanced (double-ended) as well as unbalanced (single-ended) signaling and offers the possibility of higher data rates than EIA-232-D with the same DB25 connector. Table A-4 lists the EIA-530 interconnections that are available at serial port B (SERIAL PORT 2 on the front panel) when the port is configured via serial interface modules as an EIA-530 DCE or DTE port.

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