User manual

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.