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This guide describes how to operate the Symmetri-
com 58503B GPS Time and Frequency Reference Re-
ceiver and 59551A GPS Measurements
Synchronization Module via the RS-232C port(s).
The information in this guide applies to instruments
having the number prefix listed below, unless ac-
companied by a “Manual Updating Changes” pack-
age indicating otherwise.
SERIAL PREFIX NUMBER:3805A and above
(58503B), 3805A and above (59551A)
Instruments with serial numbers below 3805A may
have earlier versions of firmware installed. There
are no operator-specific differences in previous ver-
sions of firmware.
FIRMWARE REVISION:3805A and above
(58503B), 3805A and above (59551A)
Firmware revision can be identified by using a
“*IDN?” command sent to the Receiver via RS-232C
port. See the section “Connecting a Computer or Mo-
dem,” in Chapter 2, “Serial Interface Capabilities,”
of this guide for instructions on connecting a comput-
er or modem to these products.
For assistance, contact:
Symmetricom, Inc.
2300 Orchard Parkway
San Jose, CA 95131-1017
U.S.A. Call Center:
888-367-7966 (from inside U.S.A. only – toll
free)
408-428-7907
U.K. Call Center:
+44.7000.111666 (Technical Assistance)
+44.7000.111888 (Sales)
Fax: 408-428-7998
E-mail: ctac@symmetricom.com
Internet: http://www.symmetricom.com
Warning Symbols That May Be Used In This Book
Instruction manual symbol; the product will be marked with this
symbol when it is necessary for the user to refer to the
instruction manual.
Indicates hazardous voltages.
Indicates earth (ground) terminal.
or
Indicates terminal is connected to chassis when such connection
is not apparent.
Indicates Alternating current.
Indicates Direct current.