5-9 SERIAL REMOTE
OPERATION
The ML2400A Se ries Power Me ter can be op er ated re motely through the rear
panel se rial con nec tor (See Chap ter 3, Con nec tors, for the lo ca tion of the se rial
con nec tor). Whereas GPIB has re stric tions on to tal ca ble length and ca ble
length be tween in stru ments, RS232 se rial com mu ni ca tion is not as lim ited.
The GPIB can also be prone to elec tri cal in ter fer ence and is not eas ily elec tri -
cally iso lated, while RS232 can be iso lated us ing op ti cal cou plers. Se rial in ter -
face re mote op er a tion can be use ful if the test ing is to be done in the pres ence
of high elec tri cal fields and like en vi ron ments.
While most stan dard se rial ca bles will suf fice, a 9-pin null-modem se rial in ter -
face ca ble is avail able from Anritsu as an op tional ac ces sory (part num ber
B41323). Note that the hard ware hand shake CTS and RTS lines are used to
con trol the flow of data in and out of the power me ter and must be avail able in
the ca ble as hard ware hand shak ing is al ways en abled. The DTR and DSR lines
are con nected to gether within the me ter.
The ML2400A Se ries Power Me ter se rial con nec tor pinouts are:
PIN SIG NAL
1
NOT USED
2
RX data
3
TX data
4
DTR hand shake sig nal
5
sig nal ground
6
DSR hand shake sig nal
7
RTS hand shake sig nal
8
CTS hand shake sig nal
9
NOT USED
The se rial in ter face baud rate can be set us ing the Sys tem|Rear panel|RS232
menu se lec tion or the RSBAUD com mand (page 6-70 ). Avail able baud rates
are: 1200, 2400, 4800, 9600 (de fault), 19200, and 38400. Other pa ram e ters are
pre de fined as: 8 bits, no par ity and 1 stop bit and can not be changed.
Com mands are en tered as with the GPIB in ter face, con form ing to the com -
mand for mat for the op er a tion (em u la tion) mode se lected. All GPIB com mands
are sup ported. There are some ad di tional com mands, spe cific to the se rial in -
ter face, that are pre fixed with an ex cla ma tion mark (!). In the em u la tion
modes, when run ning un der GPIB, the mea sured data is al ways avail able
when the me ter has been ad dressed to talk. In se rial mode, the me ter can not
be ad dressed to talk, but mea sure ment data can still be ob tained by us ing the
GPIB trig ger com mands
TR1 and TR2 in the HP 437 and HP 438 em u la tion
modes, and
T and I in the HP 436 em u la tion mode. All GPIB type com mands
and com mand strings should be ter mi nated with a new line char ac ter (0A hex).
The spe cial se rial mode com mands do NOT re quire a ter mi na tion char ac ter.
ML2400A OM 5-5
PROCEDURES SERIAL REMOTE OPERATION
NOTE
Se rial in ter face re mote
op era tion is not avail -
able when the
ML2400A Se ries
Power Me ter is op er at -
ing from the in ter nal
bat tery.
NOTE
CDMA mode does not
sup port GPIB em u la -
tion.
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