| 1 –2 Short | 2 –3 Short |
| -Busy status of PD sent | -Busy status of PD sent to host CTS, |
JP2 | to host as CTS and | handshaking signal of pass through device |
| DSR at the same time | goes to host as DSR directly (default) |
Note: There must be the pass through serial output device on the pre- mounted pass through terminator connected to RS232 Out the 9 pin serial pass through port when JP2 is set to 2 –3 Short. Otherwise, the host computer may get a faulty condition in an attempt to write to this serial port.
D. Serial Data and Self-test
Serial characters are received with data formatted as a 10-bit word. The command set is structured to allow transmission of 8 data bits. The data rate is default at 9600 baud per second and can be changed to 19200 baud per second as described above. There is no parity bit and 1 stop bit. The level is RS-232C
| start | b0 | b1 | b2 | b3 | b4 | b5 | b6 | b7 | stop |
| bit | bit |
| | | | | | | | |
Self-test is a very useful feature and can be activated by sending 1F-40 (HEX). The test may be terminated by sending 1B-40 (HEX). The test sequence is as follows
a.Clear screen, Cursor home.
b.Vertical scroll mode test, show product ID and version.
c.For PD-7100/7200, it enters Overwrite mode and displays 20 characters of “A” followed by 20 characters of “B”.
For PD-7110/7210 and PD-7120/7220, it enters Horizontal scroll mode test, and shows 20 CHINESE characters (addresses: B0A1, B1A2, B2A3, ……, BEAF, BFB0, C0B1, ……, C3B4)
d.For PD-7100/7200, it enters Horizontal Scroll mode after clearing screen, then displays ASCII code font of current page from 21 to FF (HEX).
For PD-7110/7210 and PD-7120/7220, it enters Wrap around mode and shows ASCII code font from 21 to 7F (HEX).
e.Go to step a and repeat the test
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