User`s guide

Vector ZCB Single Board COmputer
RS-232C name Source RS-232C
ZCB- Pin
Ccrnponent 8251 pin
pin
number
number on connected
nane, or
(at the
16 pin
to on the other if
DB-25)
socket J2
board .
relevant
Protective Ground Both
1 16
Transmitted Data
orE 2
15 U16,13
RxD
Rece i ved Data OCE 3
14
U15,6 TxD
Request to Serrl
orE 4
13
Ul5,11
Rl'S
Clear to Send OCE 5
12
U16,1 ers
Data Set Ready
OCE 6
11
U16,4 I:SR
Signal Ground Both
7 10
GND
Received Line
Signal Detector
OCE
8
9
(Reserved for Data
Set Testing)
9
(Reserved for Data
Set Testing)
10
(unassigned)
11
Secondary Received
Line Signal.Det.
OCE 12
Secondary Clear to
Serrl
OCE 13
Secondary
Transmi tted Data
orE 14 1
Transmi tter Signal
Element Timing
(orE Source)
orE 15 2
Secorrlary Received
Data OCE
16
3
Receiver Signal
E1e:rren t Timing
(OCE Source)
OCE
17
4
(Unassigned)
18 5
Secomary Request
to Send
urE
19
6
Data Terminal Ready orE
20
7
U15,8
urR
Signal Quali ty
Detector
OCE 21
8
Ring Indicator
OCE
22
Data Signal Rate
Detector Either
23
Transmi tter Signal
. E1e:rrent Timing
(OCE Source)
OCE 24
(unassigned)
25
RS-232C and Connections on ZCB Board
..
2-16
Rev. 1-8 6/11/80