Inside the Type 146 Unit Cha
ter Three: Overview
74
The Displayless Front Panel Connector Pinout
When ordered as an optional displayless unit, the 146 instrument arrives with a front panel that
only contains a power switch, LED, and a 25-pin female Type “D” Interface connector. This
connector allows an RS-232 communications source to be connected to the front of the
displayless unit. The pinout of the connector is listed in Table 30, page 75. The RS-232 cable
used on the front panel connector (MKS p/n CB146-21) is not the same as the RS-232 cable used
for rear panel communications (refer to Table 32, page 77, for the proper MKS part number).
Both the Interface connector, located on the front panel, and an RS-232 connector, located on the
rear panel, support RS-232 communication between the 146 unit and a computer. However, the
146 unit only accepts command messages through one port at a time, though it can report status
information on both ports simultaneously. The 146 unit determines which port takes precedence
based on the state of pin 4 of the Interface connector.
Pin 4 left open:
The rear panel connector (RS-232) is active; the front panel connector
(Interface) is passive. The RS-232 connector takes precedence. It will accept command
messages and respond to query messages. The device connected to the Interface connector can
only receive RS-232 communications that are currently being issued
from
the 146 unit, through
the rear panel.
Pin 4 grounded:
The front panel connector (Interface) is active; the rear panel connector
(RS-232) is passive. The Interface connector takes precedence so that the device connected to
the front panel can communicate fully with the 146 unit. Any device connected to the rear panel
RS-232 connector can only receive messages that are currently being issued
from
the 146 unit,
through the front panel.
For regular operation, use the RS-232 connector on the rear panel to connect the 146 unit to your
system. The Interface connector provides a convenient port to connect a portable computer to the
146 unit should you need to troubleshoot the unit.
Pin 8 can supply a +5V signal, which can be used to power one of several types of remote
terminals.
The functions on pins 5 and 20 are special options that must be specifically requested from the
factory.
Remote Front Panel Cable
RS-232 Cable to Remote Front Panel CB146-21, CB146S-21
Table 29: Remote Front Panel Cables
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