Geometrics Memory-Mag G-856AX, Operation Manual

Page: 49 / 60

Geometrics, Inc
.
G-856AX Operation Manual
43
2. Power removed while
instrument was in operating
mode. 2. Dump stored data into recording
device, then press
ERASE ,
ERASE .
3. Power interrupt during
AUTO cycle or OUTPUT .
3. Remove batteries. Press the
INTERNAL RESET button on CPU
board. Install batteries. Set clock.
4. Lithium battery
malfunction. 4. Measure lithium battery voltage.
If voltage is less than 3.2V,
replace. (See page 30.)
5. Control board malfunction. 5. Return board control board (P/N
16621) for repair.
Display reads FULL 1. Memory capacity is full of
data. 1. Download or transcribe data and
erase data to clear memory space.
Console will not tune 1. Poor signal-to-noise ratio.
(See if display shows
truncated digits. Seek quieter location.
2. Low battery voltage. 2. Replace batteries.
Error message when
tuning 1. Disable Auto-tune function. 1. Operating procedures: Auto-
tune.
Partial numeric Display 1. Control board
malfunctioning. 1. Return Control board (P/N
16621) for repair.
RS-232 interface
The Electronic Industry Association (EIA) established a standard to specify voltage
levels and protocol for interfacing data-terminal and data communications equipment that
uses serial binary interchange. The latest revision to this standard has been in effect since
1969 and is referred to as RS-232C. While RS-232C specifies a very complex group of
data lines and signal levels, most devices equipped with interfaces called "RS-232C" in
fact offer a subset of the standard as their interface method. The G-856AX is one such
device.
The download cable provided for data transfer from the G-856AX is terminated with a 9-
pin female D-connector. This cable, (P/N 16492-01), is wired to connect directly to the
9-pin serial port of a MS Windows PC. The following table lists the functions assigned
to each pin of the pins used on this cable.
Table 3. RS-232 cable connector pin assignment.
9-pin
connector
RS-232
G-856AX
front panel
connector
Function
2 T Transmit Data - from the G-856AX
5 D Signal Ground - Zero reference for interface
7 G Clear To Send - When low, inhibits G-856AX output. Leave
open if not used.
The RS-232C standard specifies voltage levels and protocol for the data lines as ±12V
nominal, with voltages from 5V to 25V being acceptable. A logical "1" (mark, off or
false state) is indicated when the voltage at the interface point is more negative than -3V;