Diplomat jr Model jrN-ASV User Guide Issue No. 2 (03/01) 9
Configuration
Most configuration of the jrN is performed by interacting with the Menu
screens presented through Port A but there are two sets of hardware
jumpers that determine some properties of Port A. Reference should be
madeto the diagram onpages6and 8 when makinganychangesto the
jumpers.
Data Rate Thedatarateof Port Aisselectedbychoosingthe positionofthejumpers
on links L4 and L5.The default speeds are 9600 and 19200bps but the
clocks T1 and T2 may be configured differently by setting the
Configuration Byte D (See later section). The receive speed is selected
by link L4 and the transmit speed by link L5. If a jumper is on the right
most two pins (E-F) of a link then 9600 bps is selected. If a jumper is on
the left most two pins (D-E) of a link then the custom speed is selected
(by default 19200 bps).
Character Format The default character format used by Port A is eight data bits, no parity
bit and one stop bit (8N1). This can be configured differently by setting
the Configuration Byte C. (See later section)
DTR The state of the internal DTR signal on Port A will always determine
whether Port A will be able to transmit and it is not necessary for an
externalconnectiontobemadetopin20.SomeprintersprovideaREADY
signalon pin 19.Ifexternalcontrol is required, anditusuallyis, a jumper
between the right most pins (B-C) of link L2 will select pin 20 for DTR
control. A jumper between the left most pins (A-B) of link L2 will select
pin 19 for DTR control.
In addition the selected pin may be gently biased towards either ON or
OFF by jumpering link L1. Some devices will still hold DTR high enough
to appear ON even when they are powered off so by gently biasing the
pin OFF when the device is powered down DTR is correctly sensed.
Equally it may be desirable to keep Port A enabled all the time in which
case no links would be used on L2 and the DTR level would be
determined solely by L1. If a jumper is on the right most two pins (B-C)
of L1, DTR is biased ON and if the jumper is on the left most two pins
(A-B) of L1, DTR is biased OFF.
The DTR signal can have significant effects depending on other con-
figuration options which are described later so it is important to have it
properly configured. The default factory setting is DTR biased ON and
connected to pin 20 of Port A.
Configuration Cable If
Transparent Mode
has been selected the jrN will ignore all control
characters. (see next paragraph). This would make it difficult to re-
configure the unit so the Diplomat looks for a link between Pin 8 (or 6)
and Pin 20. If it detects a link it will interpret control characters for 15
seconds before entering
TransparentMode
.It is importantthatlinkL2 is
between pins B and C and that nothing is connected to pin 20 that will
prevent it being driven high and low by pin 8.
Note: The link must NOT be present for normal operation so a specially labelled
ConfigurationCableshould be made forthepurpose.
Port A
Hardware Options
