Ld Port Signals; Conversion To Rs-232 Signal Names - Equinox Systems MEGAPORT Hardware Reference Manual

LD Port Signals

Signal Names
The names of signals on the telco connectors of the MEGAPORT ports
indicate the direction of the signals. They are either inbound
(received by MEGAPORT) or outbound (transmitted from
MEGAPORT).
Data Signals
Each LD port uses two twisted-pairs. Data is transmitted from
the port on one pair and received on the other.
DATA IN(+) and DATA IN(-) indicates data received by the
MEGAPORT board from the attached device (inbound). DATA
IN(-) is normally connected to TxD (Transmit Data) for termi-
nals and printers. DATA IN(+) is connected to ground on the
terminal or printer.
DATA OUT(+) and DATA OUT(-) indicates data transmitted by
the MEGAPORT board to the attached device (outbound).
DATA OUT(-) is normally connected to RxD (Receive Data) for
terminals and printers. DATA OUT(+) is connected to ground
on the terminal or printer.
EIA Control Signals
No EIA modem control signals are provided on LD ports.

Conversion to RS-232 Signal Names

The conversion to RS-232 from the LD telco connector pinouts and
MEGAPORT signal names, DATA IN(+), DATA IN(-), DATA OUT(+)
AND DATA OUT(-), is accomplished with one of the Equinox cabling
accessories. These accessories and wiring techniques are discussed in
Chapter 3 under the heading Wiring to Terminal Devices.
Connecting Devices to LD Ports 41