2638A
Users Manual
1-6
Table 1-2. Rear-Panel Features (cont.)
Item Name Function
Main Power Switch
Supplies and disconnects mains power to the unit.
Mains Power
Connector
Mains power cord receptacle.
Chassis Ground
Terminal that is internally grounded to the chassis. If the Product is the
location of the ground reference point in a system, this binding post can be
used to connect other instruments to earth ground.
Serial USB Port
USB port used for remote operation. See the 2638A Remote Programmers
Guide.
LAN Connection
Network port used for remote operation. See the 2638A Remote
Programmers Guide.
Totalizer Input
Input terminal for the Totalizer feature. See “Totalizer Channel
Configuration” in Chapter 3.
DIO (Digital I/O
Input Ports)
Eight digital ports used to sense and output a digital, 8-bit transistor-
transistor logic (TTL) value that can be displayed as the 8-bit TTL value and
be recorded as the decimal equivalent.
Digital External
Alarm Trigger
Outputs
Six digital outputs that can be used to trigger a digital external alarm if a
channel exceeds the set alarm limits. See “HI and LO Channel Alarms” in
Chapter 3.
Trigger Input
Input terminal to trigger a scan when the External trigger type is used. See
Scan Test Setup” in Chapter 4.
Input Module Slots
Slots that accept the Input Modules. See “Input Module and Relay Card
Installation” in Chapter 2. The 2638A/05 has only one usable slot.
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