Casio TK-6500 Service Manual page 44

21) COM1 online test
This operation will test the COM1 online function. This test need the reception machine
as shown below;
Wiring diagram for the connection cable
Signal Pin
CD 1
RxD 2
TxD 3
DTR 4
GND 5
DSR 6
RTS 7
CTS 8
CI 9
COM1
Opeartion :
b: Baud rate selection
0= 19,200 bps 1= 9,600 bps
m: Test Mode selection
0= Self loop test
ZZ: Time out number (seconds) input between data
(default is 3 seconds. Input ZZ, ZZ seconds will be the time of time out.)
X: 0= Normally select 0.
1= When error is happened, print error receipt before retry operation.
Test procedure
1) Operate the send machine first. The send machine will wait the "C" signal (send
request) reception from the reception machine.
The send machine will wait the send request signal about 30 seconds. When it is over
30 seconds, the time out error will be printed on the receipt.
2) Operate the reception machine. Then, the both machines are communicated each
others. This time first block data wait time is 5 seconds. The total resend request time
is 5 time.
3) During communication waiting time, the display will show the "-" brinking on the most
left side digit of segment display. When the data is OK, the reception/transmission
packet number will be displayed on the segment display.
NOTE1: To stop this opeartion, press any or trun off the mode key switch.
NOTE2: The send packet data format is as follows:
( Communication format is 8 bits, even parity, stop bit= 1bit fixed.)
Block counter
STX
03h
Cable length = Max. 15m
Send
COM1
ECR
z z b m 7
1= Reception mode
Data (55h X 1,020 pcs.)
2 bytes
Total 1,024 bytes
- 42 -
Receive
COM1
ECR
Cross cable
Signal Pin
CD 1
RxD 2
TxD 3
DTR 4
GND 5
DSR 6
RTS 7
CTS 8
CI 9
COM1
2 X 7 #2 Key
2= 4,800bps 3= 2,400bps
2= Send mode
Loop back connector
3pin
Txd
2pin
Rxd
8pin
CTS
7pin
RTS
4pin
DTR
6pin
DSR
1pin
CD
9pin
CI
COM1
4= 38,400 bps
LRC