Specifications

Jumper Configurations
Table A-2
ZT 8832 Jumper Descriptions (continued).
JUMPER # DESCRIPTION
W7,
W8 Battery Backup Device Selection - deter-
mines whether the local RAM devices,
RAM LOW and RAM HIGH, are powered
by the battery when the system power is
turned off. Note that this operation is valid
only if the optional battery is present. The
RAM devices must be designed for low
power operation (less than 15 µA data
retention current). Note that the dual port
RAM is always battery-backed if the
battery is installed.
W7 W8 Battery-backed Devices
In Out Dual port, RAM LOW, and RAM HIGH
† Out In Dual port
W9-15, W18 J2 RS-232/485 Selection - configures the
82050 serial port for RS-232 or RS-485
operation. See also W1-W6 (page A-3) and
W16 and W17 (page A-5).
W9, W10, W11, W12,
W13, W18 W14, W15 Operation
In Out Selects RS-485
† Out In Selects RS-232
†Factory default jumper configuration.
A-4