Envision Peripherals NV3128 - Manual (Page 38)

NV3128 RS-422A Machine-Control Routing Switch 2-14
2.3 CABLING THE NV3128
Figures 2-2 and 2-3 at the end of this section show the rear panel
connections on the NV3128. Notice that there are old and new frames
corresponding to the old Command Interpreter and the new Universal
Control Card.
2.3.1 DATA I/O
Machine control I/O connections to the rear panel are straightforward.
D connectors terminated according to the following pin-out are plugged
into any of the 128 terminals provided.
2.3.2 CABLING THE SERIAL COMMAND INTERFACE
The control-system interface cable connects to the jack marked RS-
422 PRIMARY CNTRL" on the new frames or "RS-422/RS232 -
Controlled In" on the old frames. To implement a loop-through
connection for a multidrop, networked command environment, connect
the next piece of equipment to the looping connector next to the
primary control connector. It should be noted that the maximum
number of chained connections is six without undue signal degradation.
RS-422A:
An RS-422A cable connecting the Controller to the primary control
data connector should be a nine-wire cable meeting the EIA RS-422
specification. The connector at the NV3128 end must be a nine-pin D
connector with male pins. The connector at the controller side is
typically a nine-pin D connector with male pins. The connection list
follows: